102 results on '"Arcadio, Sotto"'
Search Results
2. Mussel-inspired superhydrophilic and antibacterial membranes for effective gravity-driven separation of oil-in-water emulsions
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Lin, Yingying, Yu, Fan, Yu, Zijian, Lin, Xiaoyan, Lin, Fang, Liu, Riri, Chen, Qin, Du, Jiale, Huang, Xuan, Gu, Ailiang, Li, Xuewei, Arcadio, Sotto, Fang, Shengqiong, Ye, Wenyuan, and Lin, Jiuyang
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- 2024
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3. Effective separation of neodymium and lanthanum by single-module hollow fiber supported liquid membrane with P507 as extractant
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Liu, Yucheng, Xu, Qian, Li, Fuping, Yu, Fan, Yu, Zijian, Hu, Kaibo, Chen, Hao, Li, Xuewei, Wang, Chonggang, Han Seo, Dong, Xie, Ming, Arcadio, Sotto, Lin, Jiuyang, Yang, Youming, and Wan, Yinhua
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- 2024
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4. High-performance antibacterial tight ultrafiltration membrane constructed by co-deposition of dopamine and tobramycin for sustainable high-salinity textile wastewater management
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Ye, Wenyuan, Yu, Fan, Yu, Zijian, Kong, Na, Lin, Xiaoyan, Liu, Riri, Du, Jiale, Huang, Xuan, Gu, Ailiang, Arcadio, Sotto, Zhang, Wenyi, Li, Xuewei, Zhao, Shuaifei, Xie, Ming, Liang, Qinghua, and Lin, Jiuyang
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- 2024
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5. Diagnóstico estadístico del conocimiento previo y de la evolución del aprendizaje transdisciplinar de las Ciencias Naturales en los Grados en Educación de una universidad pública española
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Arcadio Sotto Díaz, Pablo Melón Jiménez, Jesús María Arsuaga Ferreras, and Sergio Román Aliste
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stem ,conhecimentos prévios ,resultados de aprendizagem ,multidisciplinaridade ,Education (General) ,L7-991 - Abstract
Este estudio consiste en un diagnóstico sobre el estado de los conocimientos previos (CP) de los estudiantes que acceden al grado en Educación Primaria (GEP) impartido en la Universidad Rey Juan Carlos (URJC) a través de una serie de cuestionarios centrados en las principales disciplinas que tradicionalmente conforman las Ciencias Naturales: Biología, Geología, Física y Química. A partir de dichos datos, se establece una comparativa entre los mismos y los resultados académicos (RA) posteriores que obtienen los estudiantes tras haber cursado las asignaturas del ámbito de las Ciencias Naturales en el GEP. Los resultados muestran una correlación entre los resultados obtenidos por los estudiantes en los Cuestionarios de Conocimientos Previos (CP) y los resultados académicos (RA). La tasa de mejora es de un 67% para el conjunto de las disciplinas analizadas, lo que se traduce en una mejora de 4,5 puntos en los RA frente a los CP. Se aprecia una correlación para la Química, la Biología y el conjunto Global de las Ciencias por lo que se puede inferir, según el contraste de hipótesis, cual será la tasa de mejora de los estudiantes en estas disciplinas a partir del análisis de sus resultados en los cuestionarios de CP.
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- 2023
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6. La educación multi, inter y transdisciplinar en la formación a lo largo de la vida
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Arcadio Sotto Díaz, Laura Arroyo Martínez, and Almudena Santaella Vallejo
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currículum ,educación transdisciplinar ,eeducación interdisciplinar ,Education (General) ,L7-991 - Abstract
Los Estados deben deben apoyar fuertemente por la mejora de sus sistemas educativos, con el fin de que estos puedan formar ciudadanos del mañana que se comprometan con la construcción de sociedades económicamente responsables, sociales, igualitarias, ecológicas y, en definitiva, altamente cualificadas para construir un mundo mejor en toda la amplitud del término. Para ello sus sistemas educativos deben integrar la inter y la transdisciplinariedad educativa como métodos de enseñanza extendidos en todos los niveles, con el fin de formar personas que puedan comprender la realidad desde diferentes ángulos y alcancen resultados gracias al conocimiento de distintas disciplinas combinadas. De esta manera, los profesionales del futuro podrán ser más creativos, resolutivos y eficientes, serán menos manipulables y podrán tomar las mejores decisiones, tanto en el nivel individual, como colectivo.
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- 2023
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7. MiniOpenLab
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Bratitsis, Tharrenos, primary, Koliakou, Iro, additional, Díaz, Arcadio Sotto, additional, Arvaniti, Virginia, additional, Sarmento, Teresa, additional, Tobajas, Nuria Olga León, additional, and Barroca, Ana, additional
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- 2022
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8. Integrated loose nanofiltration-electrodialysis process for sustainable resource extraction from high-salinity textile wastewater
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Lin, Jiuyang, Chen, Qin, Huang, Xuan, Yan, Zhongsen, Lin, Xiaocheng, Ye, Wenyuan, Arcadio, Sotto, Luis, Patricia, Bi, Jinhong, Van der Bruggen, Bart, and Zhao, Shuaifei
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- 2021
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9. Three-Dimensional Stable Cation-Exchange Membrane with Enhanced Mechanical, Electrochemical, and Antibacterial Performance by in Situ Synthesis of Silver Nanoparticles
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Jiajie Zhu, Bin Luo, Yukun Qian, Arcadio Sotto, Congjie Gao, and Jiangnan Shen
- Subjects
Chemistry ,QD1-999 - Published
- 2019
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10. Integration of Bipolar Membrane Electrodialysis with Ion-Exchange Absorption for High-Quality H3PO2 Recovery from NaH2PO2
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Yangbo Qiu, Lu Yao, Jian Li, Mengjie Miao, Arcadio Sotto, and Jiangnan Shen
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Chemistry ,QD1-999 - Published
- 2019
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11. Statistical diagnosis of prior knowledge and the evolution of transdisciplinary learning of Natural Sciences in the Education Degrees of a Spanish public university
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Arcadio Sotto Díaz, Pablo Melón Jiménez, Jesús María Arsuaga Ferreras, and Sergio Román Aliste
- Abstract
This study shows a diagnosis of the state of the previous knowledge (CP) of students entering the degree in Primary Education (GEP) taught at the Universidad Rey Juan Carlos (URJC) through a series of questionnaires focused on the main disciplines that traditionally make up the Natural Sciences: Biology, Geology, Physics and Chemistry. Based on these data, a comparison between them is made and the subsequent academic results (RA) obtained by the students after having taken the subjects in the field of Didactics of Natural Sciences in the GEP. The improvement rate is 67% for all the disciplines analysed, which translates into an improvement of 4.5 points out of 10 in the RA with respect to the CP. The analysis shows that there is a significant correlation between the results obtained by the students in the CP questionnaires and the RA for the disciplines of Chemistry, Biology and the multidisciplinary group of experimental sciences. Consequently, it can be inferred, according to the hypothesis test, what the rate of improvement of the students in these disciplines will be from the analysis of their results in the CP questionnaires Este estudio consiste en un diagnóstico sobre el estado de los conocimientos previos (CP) de los estudiantes que acceden al grado en Educación Primaria (GEP) impartido en la Universidad Rey Juan Carlos (URJC) a través de una serie de cuestionarios centrados en las principales disciplinas que tradicionalmente conforman las Ciencias Naturales: Biología, Geología, Física y Química. A partir de dichos datos, se establece una comparativa entre los mismos y los resultados académicos (RA) posteriores que obtienen los estudiantes tras haber cursado las asignaturas del ámbito de las Ciencias Naturales en el GEP. Los resultados muestran una correlación entre los resultados obtenidos por los estudiantes en los Cuestionarios de Conocimientos Previos (CP) y los resultados académicos (RA). La tasa de mejora es de un 67% para el conjunto de las disciplinas analizadas, lo que se traduce en una mejora de 4,5 puntos en los RA frente a los CP. Se aprecia una correlación para la Química, la Biología y el conjunto Global de las Ciencias por lo que se puede inferir, según el contraste de hipótesis, cual será la tasa de mejora de los estudiantes en estas disciplinas a partir del análisis de sus resultados en los cuestionarios de CP. Este estudo consiste em um diagnóstico do estado de conhecimentos prévios (CP) dos alunos que ingressam na licenciatura em Educação Primária (GEP) ministrada na Universidade Rey Juan Carlos (URJC) por meio de uma série de questionários focados nas principais disciplinas que tradicionalmente compõem as Ciências Naturais: Biologia, Geologia, Física e Química. Com base nestes dados, estabelece-se uma comparação entre os mesmos e os resultados acadêmicos (RA) subsequentes obtidos pelos alunos após a conclusão das disciplinas da área de Ciências Naturais no GEP. Os resultados mostram uma correlação entre os resultados obtidos pelos alunos nos Questionários de Conhecimentos Prévios (CP) e os Resultados Acadêmicos (RA). A taxa de melhora é de 67% para todas as disciplinas analisadas, o que se traduz numa melhoria de 4,5 pontos nos RA em relação aos CP. Aprecia-se uma correlação para Química, Biologia e o conjunto Global de Ciências, para que se possa inferir, de acordo com o contraste de hipóteses, qual será o índice de melhora dos alunos nessas disciplinas a partir da análise de seus resultados nos questionários de CP. Este estudo consiste em um diagnóstico do estado de conhecimentos prévios (CP) dos alunos que ingressam na licenciatura em Educação Primária (GEP) ministrada na Universidade Rey Juan Carlos (URJC) por meio de uma série de questionários focados nas principais disciplinas que tradicionalmente compõem as Ciências Naturais: Biologia, Geologia, Física e Química. Com base nestes dados, estabelece-se uma comparação entre os mesmos e os resultados acadêmicos (RA) subsequentes obtidos pelos alunos após a conclusão das disciplinas da área de Ciências Naturais no GEP. Os resultados mostram uma correlação entre os resultados obtidos pelos alunos nos Questionários de Conhecimentos Prévios (CP) e os Resultados Acadêmicos (RA). A taxa de melhora é de 67% para todas as disciplinas analisadas, o que se traduz numa melhoria de 4,5 pontos nos RA em relação aos CP. Aprecia-se uma correlação para Química, Biologia e o conjunto Global de Ciências, para que se possa inferir, de acordo com o contraste de hipóteses, qual será o índice de melhora dos alunos nessas disciplinas a partir da análise de seus resultados nos questionários de CP.
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- 2023
12. Multi-, inter- and trans-disciplinary education in lifelong learning
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Arcadio Sotto Díaz, Laura Arroyo Martínez, and Almudena Santaella Vallejo
- Abstract
States must strongly support the improvement of their educational systems so that they can train citizens committed to building societies that are economically responsible, socially, egalitarian, ecological and, ultimately, highly qualified to build a better world in the full sense of the term. To this end, their educational systems should bet, without gaps and excuses, on educational inter- and transdisciplinarity as teaching methods extended at all levels, in order to train people who can understand reality from different angles and achieve results thanks to the knowledge of different disciplines combined. In this way, the professionals of the future will be able to be more creative, decisive, efficient, less manipulative and will be able to make the best decisions, both individually and collectively. Los Estados deben deben apoyar fuertemente por la mejora de sus sistemas educativos, con el fin de que estos puedan formar ciudadanos del mañana que se comprometan con la construcción de sociedades económicamente responsables, sociales, igualitarias, ecológicas y, en definitiva, altamente cualificadas para construir un mundo mejor en toda la amplitud del término. Para ello sus sistemas educativos deben integrar la inter y la transdisciplinariedad educativa como métodos de enseñanza extendidos en todos los niveles, con el fin de formar personas que puedan comprender la realidad desde diferentes ángulos y alcancen resultados gracias al conocimiento de distintas disciplinas combinadas. De esta manera, los profesionales del futuro podrán ser más creativos, resolutivos y eficientes, serán menos manipulables y podrán tomar las mejores decisiones, tanto en el nivel individual, como colectivo. Os Estados devem apoiar fortemente a melhoria de seus sistemas educacionais, para que possam formar cidadãos comprometidos com a construção de sociedades economicamente responsáveis, sociais, igualitárias, ecológicas e, em última análise, altamente qualificados para construir um mundo melhor no pleno sentido do termo. Para isso, seus sistemas educacionais devem apostar pela inter e transdisciplinaridade educacional como métodos de ensino estendidos em todos os níveis, a fim de formar pessoas que possam entender a realidade a partir de diferentes ângulos e alcançar resultados graças ao conhecimento de diferentes disciplinas combinadas. Desta forma, os profissionais do futuro poderão ser mais criativos, decisivos, eficientes, menos manipuláveis e poderão tomar as melhores decisões, tanto individual como coletivamente. Os Estados devem apoiar fortemente a melhoria de seus sistemas educacionais, para que possam formar cidadãos comprometidos com a construção de sociedades economicamente responsáveis, sociais, igualitárias, ecológicas e, em última análise, altamente qualificados para construir um mundo melhor no pleno sentido do termo. Para isso, seus sistemas educacionais devem apostar, sem lacunas e desculpas, pela inter e transdisciplinaridade educacional como métodos de ensino estendidos em todos os níveis, a fim de formar pessoas que possam entender a realidade a partir de diferentes ângulos e alcançar resultados graças ao conhecimento de diferentes disciplinas combinadas. Desta forma, os profissionais do futuro poderão ser mais criativos, decisivos, eficientes, menos manipuláveis e poderão tomar as melhores decisões, tanto individual como coletivamente.
- Published
- 2023
13. MiniOpenLab
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Tharrenos Bratitsis, Iro Koliakou, Arcadio Sotto Díaz, Virginia Arvaniti, Teresa Sarmento, Nuria Olga León Tobajas, and Ana Barroca
- Abstract
Education for sustainable development and STEM education are two major EU priorities. Both should be addressed from an early age. At school, children must be motivated to learn maths and science and to imagine working in these fields, and to learn about sustainability and develop attitudes and behaviours that are in line with the UN's SD Goals. Over the past years, children have taken interest in SD and in some cases. By contrast, STEM is still regarded as difficult and unattractive by many children. Thus, it may be beneficial to couple both these fields. The project MiniOpenLabs proposes to set-up and test a different methodology with a higher prevalence of experiential learning and relying on the collaboration between science and technology organisations, enterprises, and civil society to ensure relevant and meaningful engagement of all societal actors with science and increase the uptake of science studies, citizen science initiatives and science-based careers, employability, and competitiveness.
- Published
- 2022
14. Conversion of S-2-amino-1-butanol-<scp>l</scp>-tartrate to S-2-amino-1-butanol by Using Bipolar Membrane Electrodialysis for Post-treatment of Direct Enantioseparation
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Lu Yao, Yayue Lv, Arcadio Sotto, Jiangnan Shen, Junbin Liao, Tang Cong, Wu Sifan, and Huimin Ruan
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Antituberculosis drug ,Chromatography ,Renewable Energy, Sustainability and the Environment ,General Chemical Engineering ,Butanol ,02 engineering and technology ,General Chemistry ,Tartrate ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Ethambutol Hydrochloride ,chemistry.chemical_compound ,Membrane ,chemistry ,Environmental Chemistry ,lipids (amino acids, peptides, and proteins) ,Post treatment ,0210 nano-technology - Abstract
In this work, a green route for the preparation of S-2-amino-1-butanol in the post-treatment for direct enantioseparation for the antituberculosis drug ethambutol hydrochloride has been explored. T...
- Published
- 2021
15. Data Mining with Enhanced Neural Networks-CMMSE.
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Ana Martínez Blanco, Angel Castellanos Peñuela, Luis Fernando de Mingo López, and Arcadio Sotto
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- 2013
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16. Effect of Microstructures of Side-Chain-Type Anion Exchange Membranes on Mono-/Bivalent Anion Permselectivity in Electrodialysis
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Jiangnan Shen, Junbin Liao, Chao Wang, Huimin Ruan, Nengxiu Pan, and Arcadio Sotto
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Membrane ,Polymers and Plastics ,Ion exchange ,Chemistry ,Process Chemistry and Technology ,Organic Chemistry ,Inorganic chemistry ,Side chain ,Electrodialysis ,Microstructure ,Bivalent (genetics) ,Ion - Abstract
Highly monovalent/bivalent anion permselectivity of anion exchange membranes (AEMs) is of great relevance for a wide range of applications, especially in electrodialysis (ED). In this study, two se...
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- 2020
17. Prediction of the Amount of Wood Using Neural Networks.
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Ana Martínez Blanco, Arcadio Sotto, and Angel Castellanos Peñuela
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- 2012
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18. Three-Dimensional Stable Cation-Exchange Membrane with Enhanced Mechanical, Electrochemical, and Antibacterial Performance by in Situ Synthesis of Silver Nanoparticles
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Yukun Qian, Jiajie Zhu, Arcadio Sotto, Bin Luo, Congjie Gao, and Jiangnan Shen
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In situ ,Chemistry ,Membrane ,Materials science ,Chemical engineering ,General Chemical Engineering ,General Chemistry ,Electrochemistry ,QD1-999 ,Silver nanoparticle ,Article - Abstract
In this study, a simple and facile approach was proposed to synthesize silver nanoparticles (AgNPs) loaded cation-exchange membranes (CEMs). A wide analytical study involving scanning electronic microscopy, X-ray diffraction, and X-ray photoelectron spectroscopy was accomplished to corroborate that the in situ generated AgNPs were uniformly dispersed in the polymer matrix. In addition, as a result of the proposed synthesis strategy, the cross-linking structure inside the membrane was formed. The proper particle size and dispersibility of the AgNPs improved the mechanical properties of the membranes. Besides, the optimal AgNP-loaded CEM exhibited excellent bacterial killing activities against Gram-negative bacteria and showed a controlled improvement in the electrochemical performance of the prepared membranes. These effects were caused by the obtained distribution of AgNPs near ion-exchange groups that increased the aggregation of water molecules around them, improving the efficiency of ion transport due the formation of array broad ion-transport channels. The optimized CEM [sulfonated polysulfone (60SPSF)-C3#-Ag-2] exhibited an enhanced NaCl removal ratio of 67.5% with a high current efficiency (96.9%) and a low energy consumption (5.84 kWh kg–1). The distance of the inhibition zone from the boundary of the membrane of SPSF-C3#-Ag-2 reached 4.8 mm. These results led us to suggest that the proposed synthesis strategy may have potential applications in the field of antibacterial and desalting ion-exchange membranes.
- Published
- 2019
19. Polythyleneimine-modified original positive charged nanofiltration membrane: Removal of heavy metal ions and dyes
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Jiangnan Shen, Arcadio Sotto, Yawei Qi, Congjie Gao, Lifang Zhu, and Xin Shen
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chemistry.chemical_classification ,Metal ions in aqueous solution ,Filtration and Separation ,02 engineering and technology ,Polymer ,021001 nanoscience & nanotechnology ,Analytical Chemistry ,Divalent ,Membrane ,020401 chemical engineering ,chemistry ,Covalent bond ,Nanofiltration ,0204 chemical engineering ,0210 nano-technology ,Selectivity ,Polyimide ,Nuclear chemistry - Abstract
The performance of nanofiltraton (NF) membranes are characterized by a high selectivity for multivalent anions, whereas poor selective separation capacity for multivalent cations and heavy metal ions. In this work, a new positively charged NF membrane was prepared by using 2-chloro-1-methyliodopyridine as an active agent to graft polyimide polymer onto the membrane surface via covalent bonding with surface carboxylic groups. The results showed that the prepared membranes had a high selective separation for divalent and monovalent salts (MgCl2 97.1%, CaCl2 96.8%, Na2SO4 83.5%, MgSO4 87.3%, NaCl 49%, LiCl 32%), and also exhibited a high removal efficiency for toxic heavy metal ions and dyes (CuCl2 96%, NiCl2 95.8%, CrCl3 98.0%, Tropaeolin O 98.3%, Victoria blue B 99.2%, Semixylenol orange 99%, Neutral 98.2%).
- Published
- 2019
20. Study on Recovering High-Concentration Lithium Salt from Lithium-Containing Wastewater Using a Hybrid Reverse Osmosis (RO)–Electrodialysis (ED) Process
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Lu Yao, Jiangnan Shen, Yangbo Qiu, Huimin Ruan, Arcadio Sotto, and Tang Cong
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chemistry.chemical_classification ,Materials science ,Renewable Energy, Sustainability and the Environment ,General Chemical Engineering ,Extraction (chemistry) ,Salt (chemistry) ,chemistry.chemical_element ,02 engineering and technology ,General Chemistry ,Energy consumption ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,01 natural sciences ,0104 chemical sciences ,chemistry ,Wastewater ,Environmental Chemistry ,Lithium ,Sewage treatment ,0210 nano-technology ,Reverse osmosis - Abstract
A novel industrial lithium-containing wastewater depth concentrating process integrating reverse osmosis (RO) and electrodialysis (ED) into a system is presented. A systematic analytical study was accomplished to optimize the studied parameters and minimize the energy consumption. The tested parameters were as follows: RO recovery by adding pressure, ED voltage drop, the concentration of RO retentate in ED feed solution, ED volume ratio, and ED operating mode. By using RO retentate instead of initial wastewater in the ED process, water energy consumption was reduced by 3.41 times from 26.67 to 7.81 kW h/m3, while optimizing the RO retentate concentration for the ED feed solution reduced the cost to 0.47 $/kg. The results showed that RO is crucial to preconcentrate lithium salt and save energy. Furthermore, the final LiCl concentration can approach as high as 87.09 g/L with the secondary ED process (Vd:Vc = 3:1), while the energy consumption can be saved as 7.71 kW h/m3 when the experiments stopped in regi...
- Published
- 2019
21. Fabricating a pH-responsive membrane through interfacial in-situ assembly of microgels for water gating and self-cleaning
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Mengjie Miao, Shanshan Yang, Huawen Liu, Congjie Gao, Arcadio Sotto, Yuanwei Liu, Yan Zhao, and Jiangnan Shen
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In situ ,Chemistry ,Filtration and Separation ,02 engineering and technology ,Gating ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,Chemical engineering ,Self cleaning ,Drug delivery ,Pyridine ,General Materials Science ,Water treatment ,Physical and Theoretical Chemistry ,0210 nano-technology ,Membrane surface - Abstract
Environmental stimuli-responsive membranes have many latent applications in numerous fields, for example, chemical/biological separations, water treatment, drug delivery, self-cleaning material and chemical sensor. In this study, a pH-responsive membrane with in-situ assembled stimuli-responsive microgels on membrane surface and internal channels wall was fabricated by the coagulation step of the phase-inversion process. Interestingly, it was found that poly(4-vinyl pyridine) (P4VP) microgel can be mobilized onto the membrane surface by using an acidic coagulation bath. Meanwhile, the membrane-based materials with different hydrophobic properties showed a great effect on the migration of microgel onto the channel surface. The inner pores of these responsive membranes can self-adjust its size with the changes of outside pH stimulus. Moreover, the gate-controlled water permeability of pH-responsive membranes was explored at the pH interval from pH 2 to pH 6. Investigations revealed that the P4VP microgel-assembled membrane had excellent pH-responsive performance. In addition, these pH-responsive membranes with embedded microgels on surface and inner pores wall also exhibited excellent reversible behaviors and self-cleaning properties.
- Published
- 2019
22. Effect of functionality of cross-linker on sulphonated polysulfone cation exchange membranes for electrodialysis
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Junbin Liao, Congjie Gao, Shen Pengxin, Jiajie Zhu, Jiangnan Shen, Bin Luo, Arcadio Sotto, and Jin Wei
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Materials science ,Polymers and Plastics ,General Chemical Engineering ,Membrane structure ,02 engineering and technology ,General Chemistry ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Biochemistry ,Desalination ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Chemical engineering ,Materials Chemistry ,Environmental Chemistry ,Polysulfone ,0210 nano-technology ,Science, technology and society ,Ion transporter - Abstract
Exploring a desirable cross-linker applied in cation exchange membranes (CEMs) to improve dimensional stability as well as electrochemical performance has a great signifcance for the current membrane science and technology. In this investigation, a sequence of crosslinked sulphonated polysulfone (SPSF) CEMs has been prepared to explore the influence of the crosslinking functionality on the dimensional stability and electrodialysis (ED) performance of modified membranes. Different cross-linker structures were obtained according to the cross-linker agent content added during the synthesis route. As expected, the membrane surface became smoother with increasing cross-linker content, presumably as result of the denser structure established. The dimension stability increases according to the crosslinking degree applied, whereas the permselectivity of membranes depends on the conjunction of many important and interlinked factors, including the formation of narrow ion transport channels and the variations in the exchanges sites concentration. It was observed that the optimized CEM (60SPSF-C2#) showed the highest NaCl removal ratio (91.7%) during the desalination experiments and exhibited the higher current efficiency (95.7%) and lowest energy consumption (6.55 kWh kg−1). These results suggest the formation of the optimum three-dimensional network configuration for the membrane structure determined by the functionality of cross-liker selected in this investigation.
- Published
- 2019
23. Highly conductive anion exchange membranes with low water uptake and performance evaluation in electrodialysis
- Author
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Junbin Liao, Yuanwei Liu, Jiangnan Shen, Huimin Ruan, Bart Van der Bruggen, Arcadio Sotto, and Liang Hao
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Chemical substance ,Ion exchange ,Trimethylamine ,Filtration and Separation ,02 engineering and technology ,Electrodialysis ,021001 nanoscience & nanotechnology ,Analytical Chemistry ,law.invention ,chemistry.chemical_compound ,Membrane ,020401 chemical engineering ,Magazine ,chemistry ,law ,Degradation (geology) ,0204 chemical engineering ,0210 nano-technology ,Science, technology and society ,Nuclear chemistry - Abstract
The present work reports the preparation of a series of novel highly durable imidazolium-decorated anion exchange membranes (AEMs), with 3D network structure, via ultraviolet crosslinking reaction between 1-vinylimidazole and 1,6-hexanedithiol. AEM modified with trimethylamine (TMA) groups (no crosslinking, 45.7%) showed a significantly reduced water uptake within a range of 14.4–23.6% at 80 °C. Due to relatively good alkali-resistant of imidazolium groups and the compact structure stemmed from crosslinking network, the optimum cross-linked AEM (BPPO-Im 0.3) can retard the degradation and exhibits superior alkaline stability in 1.0 M NaOH at 60 °C for over 15 days, compared with TMA modified AEM. In ED application, BPPO-Im 0.3 AEM has a higher NaCl removal ratio of 77.82% than that of commercial AEM-Type II (74.13%) within 3 h experimental time. Accordingly, it shows higher current efficiency (67.43%) and lower energy consumption (1.94 kWh kg−1 NaCl), compared to commercial one (62.83%; 2.05 kWh kg−1). The facile fabrication process and the better-performance are suggestive of that BPPO-Im 0.3 is potentially applicable in ED.
- Published
- 2019
24. Constructing an internally cross-linked structure for polysulfone to improve dimensional stability and alkaline stability of high performance anion exchange membranes
- Author
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Chao Wang, Yuliang Jiang, Jiefeng Pan, Arcadio Sotto, and Jiangnan Shen
- Subjects
Aqueous solution ,Materials science ,Ion exchange ,Renewable Energy, Sustainability and the Environment ,Energy Engineering and Power Technology ,Network structure ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,0104 chemical sciences ,chemistry.chemical_compound ,Fuel Technology ,Membrane ,Chemical engineering ,chemistry ,Polysulfone ,0210 nano-technology - Abstract
The preparation of quaternary ammonium polysulfone anion exchange membranes (AEMs) with good dimensional stability and alkaline stability is an urgent problem to solve. In response, a series of cross-linked based on polysulfone and 4, 4′-trimethylenedipiperidine (TMDP) as crosslinkers with different degrees AEMs were developed in this work through a simple process. Among the fabricated AEMs, CAPSF-5 exhibits superb alkaline stability in a 1 M KOH aqueous solution at 60 °C for 15 days, whereas the non-crosslinked APSF membrane became tremendously brittle within 24 h and could not be further studied under the same conditions. In addition, even at 60 °C, CAPSF-5 demonstrates a superior dimensional stability compared to the non-crosslinked APSF membrane due to the formation of a dense internal network structure. These observations demonstrate that crosslinked CAPSF membranes can be a viable strategy to improve the deficiency of the polysulfone backbone, especially in terms of alkaline stability.
- Published
- 2019
25. Preparation of water-based anion-exchange membrane from PVA for anti-fouling in the electrodialysis process
- Author
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Jiefeng Pan, Yu Chen, Yuanwei Liu, Junbin Liao, Arcadio Sotto, Shanshan Yang, and Jiangnan Shen
- Subjects
Fouling ,Ion exchange ,Filtration and Separation ,02 engineering and technology ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Desalination ,Polyvinyl alcohol ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,Chemical engineering ,chemistry ,Distilled water ,medicine ,General Materials Science ,Physical and Theoretical Chemistry ,Swelling ,medicine.symptom ,0210 nano-technology - Abstract
Anion exchange membrane (AEMs) fouling is a serious problem influencing membrane performance during electrodialysis process(ED), which would increase power consumption and reduce water recovery. In this paper, an aliphatic anion-exchange membrane was prepared from quaternized polyvinyl alcohol (QPVA) via dual cross-linking through annealing treatment and condensation reaction to restrain the membrane water swelling. The Wu% of QPVA membrane could be reduced to 22.87 ± 0.81%. Due to the hydrophilia (59.86 ± 0.21°), negative ζ-potential surface and aliphatic matrix of QPVA, no transition time appeared under our experiment condition, indicating the QPVA membrane was scarcely fouled by SDBS. And the existence of SDBS in dilute solution generated slightly effect on the QPVA membrane resistance and only 7.47 ± 0.21% reduction of the desalination rate in ED process. Furthermore, only distilled water was used as solution or reaction media, without any harmful organic solvents, presenting an environmentally friendly route for the preparation of water-based anion-exchange membrane. So, the excellent anti-fouling performance along with green preparation of QPVA showed its remarkable prospect for desalination purpose in ED process.
- Published
- 2019
26. A facile approach to prepare crosslinked polysulfone-based anion exchange membranes with enhanced alkali resistance and dimensional stability
- Author
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Jiangnan Shen, Nengxiu Pan, Junbin Liao, Huimin Ruan, Chao Wang, Arcadio Sotto, Yuliang Jiang, and Congjie Gao
- Subjects
Ion exchange ,General Chemical Engineering ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Alkali metal ,01 natural sciences ,Desalination ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Reagent ,Cation-exchange capacity ,medicine ,Polysulfone ,Swelling ,medicine.symptom ,0210 nano-technology ,Nuclear chemistry - Abstract
Novel anion exchange membranes with enhanced ion exchange capacity, dimensional stability and alkali stability were prepared by a facile synthesis method. Internal crosslinking networks in the resulting membranes were achieved by reacting chloromethylated polysulfone with 4,4′-trimethylene bis(1-methylpiperidine) (BMP), where BMP was used as both a quaternization reagent and crosslinker without requirement of post-functionalization. In order to evaluate the alkali resistance and dimension stability performance of the resulting membranes, the molar ratio of BMP in the resulting membranes was fixed at four different contents: 40%, 60%, 80% and 100%. The obtained membranes were accordingly denoted as CAPSF-N, in which N = 40, 60, 80 and 100, respectively. Due to the dense internal network structure and spatial conformation of the six-membered rings, the resulting CAPSF-N AEMs showed enhanced dimensional structures (at 60 °C, the water uptakes and swelling ratios of CAPSF-N were 8.42% to 14.84% and 2.32% to 5.93%, respectively, whereas those for the commercial AEM Neosepta AMX were 44.23% and 4.22%, respectively). In addition, after soaking in 1 M KOH solution at 60 °C for 15 days, the modified membranes exhibited excellent alkaline stability. The CAPSF-100 membrane showed the highest alkali stability (retained 85% of its original ion exchange capacity and 84% of its original OH− conduction after the alkaline stability test), whereas the non-crosslinked APSF broke into pieces. Additionally, compared to the commercial Neosepta AMX membrane under the same test conditions, the desalination efficiency of CAPSF-100 was enhanced, and the energy consumption was lower.
- Published
- 2019
27. A durable and antifouling monovalent selective anion exchange membrane modified by polydopamine and sulfonated reduced graphene oxide
- Author
-
Arcadio Sotto, Jiangnan Shen, Congjie Gao, Yan Zhao, Jin Yali, and Huimin Liu
- Subjects
Ion exchange ,Chemistry ,Biological adhesion ,Graphene ,education ,Oxide ,Filtration and Separation ,02 engineering and technology ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Analytical Chemistry ,law.invention ,Biofouling ,chemistry.chemical_compound ,Membrane ,Chemical engineering ,law ,0210 nano-technology ,Selectivity - Abstract
Developing a durable and antifouling monovalent selective anion exchange membrane is critical in practical electrodialysis (ED) process. Herein, a commercial anion exchange membrane was modified by sulfonated reduced graphene oxide (S-rGO) and polydopamine (PDA). Inspired by biological adhesion from mussels, the PDA coating on the surface of S-rGO-PDA membrane enhanced the stability of S-rGO nanosheets due to strong adhesion. The monovalent anion selectivity was evaluated by means of the Cl - / SO 4 2 - permeselectivity, and stability property was measured by the ion concentration changes of Cl - and SO 4 2 - for a long time application of ED. Moreover, antifouling property was measured by recording the time course of the potential difference in the presence of sodium dodecyl benzene sulfonate (SDBS). The results show that permselectivity of S-rGO-PDA membrane is 2.50, which is higher than pristine membrane (1.08). In addition, S-rGO-PDA membrane is stable, the permselectivity did not change significantly during 70 h ED process. Besides antifouling property of S-rGO-PDA membranes is improved compared with S-rGO membranes.
- Published
- 2018
28. Bioinspired dual stimuli-responsive membranes with enhanced gating ratios and reversible performances for water gating
- Author
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Yan Zhao, Huawen Liu, Jiajie Zhu, Arcadio Sotto, Congjie Gao, Junbin Liao, Jiangnan Shen, and Bart Van der Bruggen
- Subjects
In situ ,Materials science ,Membrane permeability ,Shell (structure) ,Filtration and Separation ,02 engineering and technology ,Gating ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Controlled release ,0104 chemical sciences ,Membrane ,Chemical engineering ,General Materials Science ,Physical and Theoretical Chemistry ,Phase inversion (chemistry) ,0210 nano-technology - Abstract
Self-regulation of membrane permeability performance is highly desirable for porous membrane applications. Inspired by the stomatal closure behaviour of plant leaves in response to environmental changes, here we report a series of dual thermo- and pH-responsive membranes based on the poly(4-vinyl pyridine) (P4VP) core/poly(N-isopropylacrylaminde) (PNIPAM) shell microgels. The stimuli-responsive microgels underwent in situ surface segregation and uniformly decorated on the surface of internal channels during the phase inversion process. The hydraulic permeability performance of the dual responsive membranes (DRMs) has been investigated within a temperature range of 20–50 °C and a wide pH range (spanning pH 2–6). The water flux of optimized membrane (M2) varied from 1.94 kg m−2 h−1 at 20 °C/pH 2–474.91 kg m−2 h−1 at 50 °C/pH 6 with a high gating ratio of 245. Investigations revealed that microgels based on different thickness of PNIPAM shell conferred different thermo-/pH-responsive properties to the DRMs. For example, the thicker PNIPAM shell enhanced the thermo-response performance, while the pH-response performance was restrained. These optimum smart gating membranes with enhanced gating coefficient and reversibility are potential for the applications in water gating and controlled release systems.
- Published
- 2018
29. Stable cycloaliphatic quaternary ammonium-tethered anion exchange membranes for electrodialysis
- Author
-
Yuliang Jiang, Jiangnan Shen, Bart Van der Bruggen, Jian Li, Junbin Liao, Arcadio Sotto, Shanshan Yang, Huimin Ruan, and Yanqing Xu
- Subjects
Aqueous solution ,Polymers and Plastics ,Ion exchange ,General Chemical Engineering ,Oxide ,Trimethylamine ,02 engineering and technology ,General Chemistry ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Materials Chemistry ,Environmental Chemistry ,Hydroxide ,Ammonium ,0210 nano-technology ,Nuclear chemistry - Abstract
In this work, we have investigated a series of anion exchange membranes (AEMs) based on brominated poly(2,6-dimethyl-1,6-phenylene oxide) (BPPO) tethered with three saturated heterocyclic quaternary ammonium groups (QAs) of 1-methylpyrrolidine (MPY), N-methylpiperidine (MPRD), and 4-methylmorpholine (MMPH) for electrodialysis (ED) applications, respectively, along with BPPO with trimethylamine (TMA) and Neosepta AMX made for comparison. Our investigations demonstrate that the optimized BPPO-MPRD, having an ion exchange capacity of 1.67 mmol g−1, is highly stable in aqueous KOH (1 mol L−1) with ion exchange capacity retention ratio of 85.1% and hydroxide conductivity retention ratio of 80.3% at 60 °C for over 15 days, relative to other heterocyclic amine decorated AEMs. In ED application process, BPPO-MPRD shows the NaCl removel ratio of 98.8% and energy consumption of 12.58 kWh kg−1, outperforming the Neosepta AMX (97.4% & 15.76 kWh kg−1). The results demonstrate that the as-prepared BPPO-MPRD AEM can be applied in ED.
- Published
- 2018
30. Preparation and characterization of an amphiphilic polyamide nanofiltration membrane with improved antifouling properties by two-step surface modification method
- Author
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Arcadio Sotto, Jiangnan Shen, Bart Van der Bruggen, Huimin Ruan, Bin Li, Congjie Gao, and Jianbing Ji
- Subjects
Chemistry ,General Chemical Engineering ,Membrane fouling ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Surface energy ,0104 chemical sciences ,Biofouling ,Membrane ,Chemical engineering ,Amphiphile ,Polyamide ,Surface modification ,Nanofiltration ,0210 nano-technology - Abstract
Membrane fouling is an urgent problem needing to be solved for practical application of nanofiltration membranes. In this study, an amphiphilic nanofiltration membrane with hydrophilic domains as well as low surface energy domains was developed, to integrate a fouling-resistant defense mechanism and a fouling-release defense mechanism. A simple and effective two-step surface modification of a polyamide NF membrane was applied. Firstly, triethanolamine (TEOA) with abundant hydrophilic functional groups was grafted to the membrane surface via reacting with the residual acyl chloride group of the nanofiltration membrane, making the nanofiltration membranes more hydrophilic; secondly, the 1H,1H,2H,2H-perfluorodecyltrichlorosilane (PFTS), well-known as a low surface energy material, was covalently grafted on the hydroxyl functional groups through hydrogen bonding. Filtration experiments with model foulants (bovine serum albumin (BSA) protein solution, humic acid solution (HA) and sodium alginate solution (SA)) were performed to estimate the antifouling properties of the newly developed nanofiltration membranes. As a result of surface modification proposed in this study the antifouling properties of an amphiphilic modified F-PA/PSF membrane were enhanced more than 10% compared to the PA/PSF specimen in terms of flux recovery ratio.
- Published
- 2018
31. Engineering of thermo-/pH-responsive membranes with enhanced gating coefficients, reversible behaviors and self-cleaning performance through acetic acid boosted microgel assembly
- Author
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Arcadio Sotto, Yan Zhao, Congjie Gao, Huawen Liu, Jiangnan Shen, Ning Jia, Bart Van der Bruggen, and Zhao Xueting
- Subjects
In situ ,Materials science ,Renewable Energy, Sustainability and the Environment ,02 engineering and technology ,General Chemistry ,Gating ,Atmospheric temperature range ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Acetic acid ,chemistry.chemical_compound ,Membrane ,chemistry ,Chemical engineering ,Self cleaning ,Ph range ,General Materials Science ,0210 nano-technology ,Phase inversion - Abstract
Inspired by stomata, a series of single or dual thermo-/pH-responsive smart gating membranes (SGMs) were prepared with in situ assembled stimuli-responsive microgels as gates. Highly cross-linked poly(N-isopropylacrylamide-co-methylacrylic acid) P(NIPAM-co-MAA) microgels underwent in situ surface segregation during the acetic acid-assisted phase inversion process, and they were uniformly decorated on the surface of the membranes and the channels. The hydraulic permeability performance of SGMs was studied within the temperature range of 25–70 °C and a wide pH range (spanning pH 3–11). Investigations revealed that microgels based on different NIPAM/MAA ratios provided different thermo/pH-responsive properties to SGMs. Higher NIPAM/MAA ratios determined the thermo-responsive performance, and higher MAA/NIPAM ratios determined the pH-responsive performance. Moreover, the SGMs with in situ assembled microgels on the surface and channel surface have enhanced gating coefficients, stimuli-reversible behaviours and self-cleaning performance.
- Published
- 2018
32. A facile avenue to modify polyelectrolyte multilayers on anion exchange membranes to enhance monovalent selectivity and durability simultaneously
- Author
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Jiefeng Pan, Jiangnan Shen, Bart Van der Bruggen, Huimin Ruan, Congjie Gao, Huimin Liu, Arcadio Sotto, and Yan Zhao
- Subjects
Chemistry ,Inorganic chemistry ,Filtration and Separation ,02 engineering and technology ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Polyelectrolyte ,0104 chemical sciences ,Polystyrene sulfonate ,chemistry.chemical_compound ,Membrane ,Covalent bond ,Molecule ,General Materials Science ,Chemical stability ,Physical and Theoretical Chemistry ,0210 nano-technology ,Selectivity - Abstract
Layer-by-layer deposition of polycations and polyanions multilayers on the surface of anion exchange membranes (AEMs) is a simple and versatile method to obtain monovalent anion selectivity. However, the stability of the polyelectrolyte multilayers (PEMs) can be compromised by the weak interactions formed between the deposited barrier and the pristine membrane surface. In this sense, cross-linking appears as an efficient method to improve the chemical stability of PEMs by covalent bonding. In this investigation, polyelectrolyte multilayers was coated on commercial AEMs by alternating electro-deposition with polystyrene sulfonate (PSS) and 2-hydro-xypropyltrimethyl ammonium chloride chitosan (HACC). Subsequently, photosensitive molecules (4,4-diazostilbene-2,2-disulfonic acid disodium salt (DAS)) were mixed into the loose multilayers by soaking in the DAS solution and chemical bonds were formed in the membrane by UV irradiation. The chemical composition and structure of the membrane were confirmed and observed by infrared spectroscopy, atomic force microscopy and scanning electron microscopy. The monovalent selectivity and durability were evaluated by electrodialysis (ED) in a Cl - /SO 4 2- system. The optimized membrane was found to have a stable selectivity during the entire duration of testing (76 h), and while a conventional multilayer modified AEMs completely loses its selectivity after 30 h. Furthermore, the modification process improved the monovalent anion selectivity from 0.39 to 4.36. The experimental results demonstrate the effectivity and feasibility of the modified strategy.
- Published
- 2017
33. Internal cross-linked anion exchange membranes with improved dimensional stability for electrodialysis
- Author
-
Jiefeng Pan, Shanshan Yang, Rongjun Yan, Yuliang Jiang, Arcadio Sotto, Jiangnan Shen, Bart Van der Bruggen, Xu Chen, and Congjie Gao
- Subjects
Chromatography ,Ion exchange ,Chemistry ,Oxide ,Filtration and Separation ,02 engineering and technology ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Desalination ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,Chemical engineering ,Ultimate tensile strength ,Cation-exchange capacity ,General Materials Science ,Thermal stability ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
Anion exchange membranes (AEMs) with a high ion exchange capacity, striking water uptake and excellent dimensional stability were prepared via an internal crosslinking networks strategy. Internal crosslinking networks were formed by reacting 4,4′-bipyridine with brominated poly (2,6-dimethyl-1,4-phenylene oxide) (BPPO). 4,4′-bipyridine not only provides a functional group but also comprises a cross-linking agent without requirements of post-functionalization. The variation of the 4,4′-bipyridine amount into the casting polymer solution was explored to regulate the performance of the anion exchange membranes, and the membrane properties were evaluated by AFM, ion exchange capacity (IEC), water uptake, the linear expansion ratio, tensile strength, thermal stability, membrane area resistance and electrodialysis experiments, etc. The results showed that the cross-linked membrane with the IEC of 1.98 mmol/g has much more outstanding dimensional stability (water uptake: 11.68%; swelling ratio: 3.8%) than non-cross-linked BPPO-Tri membrane (water uptake: 53.26%; swelling ratio: 7.71%) and commercial Neosepta AMX membrane (water uptake: 60.29%; swelling ratio: 5.08%), at the high temperature (50 °C). When being applied in ED application, the cross-linked BPPO-20 membrane (NaCl remove: 59.7%; energy consumption: 5.97 kWh/kg NaCl) exhibits slightly higher desalination efficiency and lower energy consumption than commercial Neosepta AMX membrane (NaCl remove: 58.3%; energy consumption: 6.51 kWh/kg NaCl), suggesting its promising application in ED.
- Published
- 2017
34. Sustainable recovery of high-saline papermaking wastewater: Optimized separation for salts and organics via membrane-hybrid process
- Author
-
Tang Cong, Jiangnan Shen, Arcadio Sotto, Yayue Lv, Yangbo Qiu, Junbin Liao, and Huimin Ruan
- Subjects
Chemistry ,Mechanical Engineering ,General Chemical Engineering ,Membrane fouling ,02 engineering and technology ,General Chemistry ,Electrolyte ,Electrodialysis ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,Osmosis ,Zero liquid discharge ,Membrane ,020401 chemical engineering ,Wastewater ,General Materials Science ,0204 chemical engineering ,0210 nano-technology ,Water Science and Technology ,Resource recovery - Abstract
In this work, a novel zero liquid discharge technology combining of electrodialysis (ED), electrochemical catalytic oxidation (ECO), reserve osmosis (RO) and bipolar membrane electrodialysis (BMED) was developed for sustainable recovery of high-saline papermaking wastewater. The effect of membrane type, volume ratio, membrane fouling and voltage were investigated in ED process; subsequently parameter such as electrolyte conductivity was studied in ECO process. The FKB/FAB stack shows good separation performance for the salts and organics, allowing a relatively high COD rejection of 97.80%. Meanwhile, membrane fouling was investigated through a comparison between virgin and fouled membranes. To achieve a high-saline solution with low organics, a second-stage ED process was applied. The concentration factor was increased to 1.799 with a COD rejection of 96.54% at voltage of 12 V. Simultaneously, the ECO process exhibited superior COD removal of 94.99% at the electrolyte conductivity of 4 mS/cm. Through the application of BMED at Vf:Vb:Va (volume ratio of feed, base and acid solution) of 4:1:1, the final acid and base content could approach a high value of 12.30 wt% and 10.60 wt%, respectively. Therefore, this hybrid ED-ECO-RO-BMED combined process demonstrates a strongly technical applicability for sustainable resource recovery from high-saline papermaking wastewater.
- Published
- 2021
35. Process Economic Evaluation of Resource Valorization of Seawater Concentrate by Membrane Technology
- Author
-
Wei Zhang, Mengjie Miao, Jiefeng Pan, Jiangnan Shen, Congjie Gao, Bart Van der Bruggen, and Arcadio Sotto
- Subjects
chemistry.chemical_classification ,Chromatography ,Base (chemistry) ,Renewable Energy, Sustainability and the Environment ,General Chemical Engineering ,Salt (chemistry) ,02 engineering and technology ,General Chemistry ,Electrodialysis ,021001 nanoscience & nanotechnology ,Pulp and paper industry ,Membrane technology ,Membrane ,020401 chemical engineering ,Stack (abstract data type) ,chemistry ,Environmental Chemistry ,Seawater ,0204 chemical engineering ,0210 nano-technology ,Reverse osmosis - Abstract
In this study, a process design consisting of chemical precipitation, electrodialysis with monovalent-selective membranes, and bipolar membrane electrodialysis (BMED) is proposed to valorize seawater concentrate discharged from an RO (reverse osmosis) plant for the production of acid/base and coarse salt with high purity. After pre-precipitation and electrodialysis with monovalent-selective membranes, a high purity of coarse salt (∼92%) was obtained. Furthermore, the effect of current density and feed concentration of the BMED process on the production of acid/base with high purity was investigated. It is acceptable to attain acid/base with a purity of ∼95%/∼85% when operating at a current density of 10 mA/cm2 and a feed conductivity of 100 mS/cm by applying the screened BMED stack. Finally, the total process cost for the acid/base production was estimated at $0.50/kg at the current density of 10 mA/cm2, which is appropriate and competitive for industrial application.
- Published
- 2017
36. Separation of divalent ions from seawater concentrate to enhance the purity of coarse salt by electrodialysis with monovalent-selective membranes
- Author
-
Congjie Gao, Jiefeng Pan, Jiangnan Shen, Arcadio Sotto, Bart Van der Bruggen, Mengjie Miao, and Wei Zhang
- Subjects
chemistry.chemical_classification ,Continuous operation ,Chemistry ,Mechanical Engineering ,General Chemical Engineering ,Inorganic chemistry ,02 engineering and technology ,General Chemistry ,Electrodialysis ,021001 nanoscience & nanotechnology ,Desalination ,Divalent ,Brine ,Membrane ,020401 chemical engineering ,General Materials Science ,Seawater ,0204 chemical engineering ,0210 nano-technology ,Current density ,Water Science and Technology - Abstract
In this study, an electrodialysis (ED) system which was divided into three-stage operation was designed to treat seawater concentrate. The experiment was carried using a laboratory ED-cell with an effective area of 189 cm2. Two types of monovalent selective ion-exchange membranes were investigated: CIMS/ACS and CSO/ASV. The effect of applied current density during ED process was also studied. The experimental results indicate that the separation performance for divalent ions (i.e., Ca2 +, Mg2 +) with CIMS/ACS membranes stack was superior to CSO/ASV membranes stack; furthermore, a lower current density can increase the selectivity in monovalent ions to divalent ions with either the CIMS membrane or the CSO membrane. The current efficiency and energy consumption were optimal at a current density of 4 mA/cm2 by using CIMS/ACS membranes stack as the first stage of system in this experiment. Furthermore, the desalination rate (70%) was chosen as the experimental operation endpoint of the first-stage ED operation based on the experimental results. Moreover, the latter two-stage operation was used to concentrate brine to produce coarse salt after evaporation process. Finally, the repeated batch experiments confirmed the system feasibility for treating seawater concentrate to produce coarse salt with the purity of ~ 85% under continuous operation.
- Published
- 2017
37. Fouling and biofouling resistance of metal-doped mesostructured silica/polyethersulfone ultrafiltration membranes
- Author
-
Antonio Martín, Roberto Rosal, Nuria Roldán, José Antonio Perdigón-Melón, Jesús M. Arsuaga, Arcadio Sotto, and Berta Díez
- Subjects
Chromatography ,Fouling ,Chemistry ,Ultrafiltration ,Synthetic membrane ,Filtration and Separation ,02 engineering and technology ,Permeation ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Biofouling ,Membrane ,Chemical engineering ,General Materials Science ,Physical and Theoretical Chemistry ,0210 nano-technology ,Dispersion (chemistry) ,Mesoporous material - Abstract
Hybrid polyethersulfone-based ultrafiltration membranes were prepared by incorporating metal (Ag and Cu) and/or amine-functionalized mesostructured SBA-15 silica particles. The doping particles were included into the casting solution to obtain a total solids load of 3.6 wt% in the final membranes. The physicochemical characterization of particles and membranes showed a good dispersion of metals inside the mesoporous structure of silica as well as a reduced skin layer, higher pore interconnectivity, and a larger amount of pores in membranes doped with the hydrophilic fillers. Membrane surface was also slightly less hydrophobic in hybrid membranes. Membrane performance was significantly improved as result of considerable increase of water permeation without affect negatively the membrane selectivity. The organic antifouling properties were enhanced with significant permeability improvement without compromising membrane rejection performance. In addition to it, metal-loaded silica allowed preparing membranes with high antibacterial activity. The removal of colonies of Escherichia coli and Staphylococcus aureus was complete either on membrane surface or in the liquid in contact with membranes when exposed to a 1/500 nutrient broth medium for 20 h at 36 °C. The rate of metal release depended on metal speciation and represented a 0.1–0.6% of the total metal content of membranes.
- Published
- 2017
38. Progress and perspectives for synthesis of sustainable antifouling composite membranes containing in situ generated nanoparticles
- Author
-
Arcadio Sotto, Jiansheng Li, Xin Li, and Bart Van der Bruggen
- Subjects
In situ ,In situ chemical reduction ,Chemistry ,Nanoparticle ,Filtration and Separation ,Nanotechnology ,Portable water purification ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Biofouling ,Membrane ,Chemical engineering ,General Materials Science ,Water treatment ,Physical and Theoretical Chemistry ,0210 nano-technology ,Science, technology and society - Abstract
Polymeric membranes enhanced by nanoparticles have received great attention over the past decade due to their abilities to meet the growing demand in addressing the global scarcity and pollution of water resources. Many efforts have been devoted to improve the membrane performance using this strategy, and to develop novel applications via molecular-level design for nanoparticle-polymer systems. Recent advances in applying in situ preparative techniques in polymeric membrane can potentially lead to new classes of nano-enhanced membranes for advanced water purification. Considering the increasing interest in this field related to the potential for controlling the dispersion and stability of nanoparticles, we review the progress of in situ preparative techniques for water purification. Categories of in situ preparative techniques are elaborated in detail, primarily focusing on the mechanism of the sol-gel process and in situ chemical reduction, which are considered as the most common applications of in situ preparative techniques. We also describe the effect of binding styles of nanoparticles ( in situ formation in the membrane matrix or on the membrane surface) on the structure-property relationship in nano-enhanced membranes, discussing recent applications of in situ formed metal nanoparticles, metal oxide nanoparticles, polymeric nanoparticles and other nanoparticles in water treatment. Finally, we suggest the antifouling mechanisms of in situ preparative techniques and give a further perspective for the next-generation nano-enhanced membranes. Further development of nano-enhanced membranes must go hand in hand with strict regulations for drinking water consumption and environmental safety.
- Published
- 2017
39. Preparation and characterization of polyethersulfone mixed matrix membranes embedded with Ti- or Zr-incorporated SBA-15 materials
- Author
-
Antonio Martín, Jing Guo, Jeonghwan Kim, and Arcadio Sotto
- Subjects
Mixed matrix ,Materials science ,Chromatography ,Membrane permeability ,Fouling ,General Chemical Engineering ,Doping ,02 engineering and technology ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,0104 chemical sciences ,Characterization (materials science) ,body regions ,Biofouling ,Membrane ,Chemical engineering ,0210 nano-technology ,Mesoporous material ,human activities - Abstract
Functionalized SBA-15 mesoporous materials were newly developed and embedded as inorganic additive into polyethersulfone (PES) membrane. Doping the SBA-15 mesoporous materials improved membrane permeability without significant change in morphological structure of PES membrane. However, low dosage of SBA-15 of 0.3 wt.% increased fouling rate of PES membrane with BSA compound. The fouling potential in PES membrane was reduced by increasing concentration of SBA-15 materials to 0.6 wt.%. Antifouling properties of PES membrane were associated with lower BSA membrane adsorption due to the improvement of membrane hydrophilicity by SBA-15 addition.
- Published
- 2017
40. Influence of amine functionalization of silica particles fillers on the morphology and water permeation of polyethersulfone nanocomposite ultrafiltration membranes
- Author
-
Jesús M. Arsuaga, Arcadio Sotto, Antonio Martín, Nuria Roldán, and Ana Martínez
- Subjects
Nanocomposite ,Membrane ,Chemical engineering ,law ,Polymer chemistry ,Ultrafiltration ,Water treatment ,Permeation ,Porosity ,Filtration ,law.invention ,Nanomaterials - Published
- 2017
41. An anion exchange membrane modified by alternate electro-deposition layers with enhanced monovalent selectivity
- Author
-
Tang Kaini, Jiangnan Shen, Yan Zhao, B. Van der Bruggen, Huimin Liu, Congjie Gao, and Arcadio Sotto Díaz
- Subjects
Ion exchange ,Inorganic chemistry ,Filtration and Separation ,02 engineering and technology ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Electrochemistry ,01 natural sciences ,Biochemistry ,eye diseases ,0104 chemical sciences ,Polystyrene sulfonate ,chemistry.chemical_compound ,Membrane ,Sulfonate ,chemistry ,General Materials Science ,Physical and Theoretical Chemistry ,0210 nano-technology ,Selectivity ,Polarization (electrochemistry) - Abstract
A novel anion exchange membrane (AEM) is developed through poly (sodium 4-styrene sulfonate) (PSS) and hydroxypropyltrimethyl ammonium chloride chitosan (HACC) alternate electro-deposition to enhance the monovalent selectivity. Compared to the commercial original AEM, coating of the (PSS/HACC)N alternate electro-deposition multilayer on the membrane surface dramatically enhance the selectivity of anions. In addition, the permselectivity for monovalent anions of the membranes was investigated by electrodialysis experiments. For comparison, the corresponding Cl−/SO42− were chosen and the average values of permselectivity and separation efficiency of commercial AEM are 0.66 and −0.19 respectively. As result of alternate electro-deposition of PSS/HACC layers, the permselectivity raised up to 2.90 and the separation efficiency also increased up to 0.28 for nine PSS/HACC bilayers needed. Under the optimal fabricating conditions, the area resistance of membrane arrived at 4.52 Ω cm2 with nine PSS/HACC bilayers. Meanwhile, the polarization current-voltage curves and ζ-potential of membranes were also tested to characterize the electrochemical behavior of the modified membrane. The high selectivities of these membranes may enable electrodialysis applications in separation of monovalent and divalent anions.
- Published
- 2016
42. Effect of amine functionalization of SBA-15 used as filler on the morphology and permeation properties of polyethersulfone-doped ultrafiltration membranes
- Author
-
Ana Martínez, Jesús M. Arsuaga, Arcadio Sotto, Nuria Roldán, and Antonio Martín
- Subjects
Polyethylenimine ,Aqueous solution ,Membrane fouling ,Ultrafiltration ,Filtration and Separation ,02 engineering and technology ,Permeation ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Chemical engineering ,Diamine ,Polymer chemistry ,Diethylenetriamine ,General Materials Science ,Physical and Theoretical Chemistry ,0210 nano-technology - Abstract
New polyethersulfone (PES) ultrafiltration hybrid membranes were prepared by doping with different amine-functionalized mesostructured silica (SBA-15) particles added at low weight concentration (0.6% in the synthesis medium). 3-(aminopropyl) trimethoxysilane, N -(3-trimethoxysilylpropyl)ethylenediamine, and N -(3-trimethoxysilylpropyl)diethylenetriamine were used as amine precursors of the fillers obtained by co-condensation and denoted as SBA-15/Monoamine, SBA-15/Diamine, and SBA-15/Triamine, respectively. SBA-15 material functionalized with polyethylenimine was synthetized by hyperbranching polymerization with aziridine. Physicochemical characterization of fillers was achieved by nitrogen sorption, X-ray diffraction, TEM, dynamic light scattering, and elemental analysis. Membrane morphology was assessed in terms of overall porosity by water uptake and surface pore size distribution from FEG-SEM. Hydrophilicity of the membranes was determined by measuring water contact angle. Significant increase of porosity and hydrophilicity was found in all doped membranes, which exhibited substantial improve in water flux in comparison with neat PES membrane. Filtration experiments conducted with BSA protein aqueous solutions (1 g L −1 ) revealed that antifouling ability of doped membranes was gradually enhanced with amine functionalization, especially against reversible fouling. PES/SBA-15/Triamine appeared as the best specimen in both water flux and antifouling behavior with excellent long time permeation performance in repeated cleaning/filtration cycles.
- Published
- 2016
43. Fabrication of a MIL-53(Al) Nanocomposite Membrane and Potential Application in Desalination of Dye Solutions
- Author
-
Jiangnan Shen, Bart Van der Bruggen, Huimin Ruan, Arcadio Sotto, Hongwei Yu, Changmeng Guo, and Congjie Gao
- Subjects
chemistry.chemical_classification ,Materials science ,Xylenol orange ,Nanocomposite ,Aqueous solution ,General Chemical Engineering ,02 engineering and technology ,General Chemistry ,Polymer ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Desalination ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Chemical engineering ,Polymer chemistry ,Phase inversion (chemistry) ,0210 nano-technology ,Dispersion (chemistry) - Abstract
This study reports the fabrication of mixed matrix membranes (MMMs) using immersion precipitation phase inversion for promising application in desalination of dye solutions. Aromatic poly(m-phenylene isophthalamide) is used as the polymer material, and the metal–organic framework MIL-53(Al) is added to develop integrally skinned asymmetric membranes. Successful dispersion of MIL-53(Al) particles into the membrane-separating layer is confirmed by scanning electron microscopy. The optimum performance of the membranes is obtained at 0.5 wt % MIL-53(Al) concentration. In particular, the M-0.5 membrane is planned for use in separating dye/salt aqueous mixtures. It is observed that the M-0.5 membrane has a rejection for NaCl and Na2SO4 below 11% and 37%, respectively, in mixed salt/dye solutions. Additionally, the M-0.5 membrane is found to have a rejection rate of 83.9%, 98.3%, and 99.8% for nitroso-R salt, xylenol orange, and ponceau S, respectively, in mixed Na2SO4/dye solutions. The rejection rate for Na2SO...
- Published
- 2016
44. Integration of Bipolar Membrane Electrodialysis with Ion-Exchange Absorption for High-Quality H
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Yangbo, Qiu, Lu, Yao, Jian, Li, Mengjie, Miao, Arcadio, Sotto, and Jiangnan, Shen
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Article - Abstract
H3PO2 has emerged as an indispensable reducing agent for electroless nickel plating. Commercial preparation of H3PO2, with high purity and low cost, is a great challenge. In this work, a novel technique by the integration of bipolar membrane electrodialysis (BMED) with ion-exchange absorption was designed to prepare high-quality H3PO2 aqueous solution. The critical parameters, such as voltage drop, NaH2PO2 concentration, and different types of anion-exchange membranes, were systematically investigated. Continuous experiments indicated that a high yield of up to 80.06% with a low energy consumption of 4.99 kW h/kg was achieved under optimal operation conditions (voltage drop of 20 V, feed concentration of 15 wt % NaH2PO2, and anion-exchange membrane of AHA). Moreover, leakage of Na+ ions through the bipolar membrane was observed. By using T-52H cation-exchange resin, the final concentration of Na+ ions in H3PO2 aqueous solution was reduced to 20.91 mg/L. Subsequently, a long-term experiment was performed to evaluate the stability of the BMED stack, and the concentration of H3PO2 in the acid compartment reached 4.15 mol/L. Under optimal conditions, the H3PO2 production cost was estimated at $0.937 kg–1, which was competitive and economically friendly for industrial application.
- Published
- 2018
45. A two-step strategy for the preparation of anion-exchange membranes based on poly(vinylidenefluoride-co-hexafluoropropylene) for electrodialysis desalination
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Liang Hao, Jiangnan Shen, Junbin Liao, Chengzhen Zhu, Xing Gao, Arcadio Sotto, and Guibin Peng
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Materials science ,Polymers and Plastics ,Ion exchange ,Organic Chemistry ,Ionic bonding ,chemistry.chemical_element ,02 engineering and technology ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Desalination ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,chemistry ,Chemical engineering ,Materials Chemistry ,Fluorine ,Thermal stability ,Hexafluoropropylene ,0210 nano-technology - Abstract
The development of a facile approach to fabricate anion exchange membranes (AEMs) with efficient ionic transport and desirable stabilities (mechanical and dimensional) for various applications is meaningful. In this work, a two-step strategy for the preparation of AEMs with 3D network structure, via cross-linking reaction between 2-chloroacetamide (CAA) modified poly (vinylidene fluoride-co-hexafluoropropylene) (PVDF-HFP) and N,N,N′,N′-tetramethyl-1,4-diaminobutane (TMDAB) has been reported. The as-prepared AEMs with ion-exchange capacity (IEC) in the range of 1.38–1.84 mmol g−1, exhibit the much lower water uptake (13.14–22.45%, 80 °C) relative to the un-crosslinked AEM (35.89%, 80 °C). In addition, due to the presence of fluorine-based 3D network structure, the as-prepared AEMs show much enhanced mechanical and thermal stability in comparison with the un-crosslinked AEM. In the electrodialysis (ED) application, the optimized AEM shows the higher current efficiency (78.6%) and lower energy consumption (2.01 kWh kg−1 NaCl) than those of commercial AEM AEM-Type II (76.4%; 2.26 kWh kg−1), respectively, within 150 min of operation interval. The proposed facile fabrication protocol and the better-performance of optimized PVDF-HFP -based AEM demonstrate the potential ED application.
- Published
- 2021
46. Novel crosslinked brominated polyphenylene oxide composite nanofiltration membranes with organic solvent permeability and swelling property
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Huimin Ruan, Congjie Gao, Yanqing Xu, Guibin Peng, Arcadio Sotto, Yu Suyang, and Jiangnan Shen
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chemistry.chemical_classification ,Oxide ,Filtration and Separation ,02 engineering and technology ,Polymer ,Permeation ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,0104 chemical sciences ,Solvent ,chemistry.chemical_compound ,Hildebrand solubility parameter ,Membrane ,chemistry ,Chemical engineering ,medicine ,General Materials Science ,Nanofiltration ,Physical and Theoretical Chemistry ,Swelling ,medicine.symptom ,0210 nano-technology - Abstract
:Organic solvent nanofiltration (OSN) membranes have gained increasing attention for their wide applications in organic phase system. However, the fabrication method rather than the swelling behavior receives more attention during the OSN testing. In this work, a thin-film composite membrane with an internal cross-linking network by reacting 4,4-bipyridine with brominated poly (2,6-dimethyl-1, 4-phenylene oxide) (BPPO) has been prepared for organic solvent nanofiltration (OSN). The bipyridine groups substituted on the polyphenylene oxide polymer backbone act as cross-linkers and cationic channels for remarkable chemical stability and high solvent permeability. The permeability of the cross-linked BPPO (CBPPO) thin-film membranes exhibited high related to the viscosity and solubility parameter of solvents. The stability of CBPPO membrane was studied via various organic solvent immersing experiments. The result demonstrated that the composite membrane swelling changed to an extent of no more than 2.01%. It can be attributed to the low conformational flexibility of polymer chains with a high crosslinking degree. The ethanol permeation and dye rejection were compared before and after soaking. The calculation of the MWCO and membrane potential of modified CBPPO membranes showed that the swelling behavior of the CBPPO composite membranes is mainly affected by the membrane charge densities rather than the pore size.
- Published
- 2021
47. Enhancement of polyethersulfone (PES) membrane doped by monodisperse Stöber silica for water treatment
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Nora Jullok, Arcadio Sotto, Kuo Zhong, Jiuyang Lin, Jiangnan Shen, Bart Van der Bruggen, and Wenyuan Ye
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Aqueous solution ,Materials science ,Fouling ,Process Chemistry and Technology ,General Chemical Engineering ,Dispersity ,Energy Engineering and Power Technology ,Nanoparticle ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,Biofouling ,Membrane ,Chemical engineering ,Organic chemistry ,Water treatment ,0210 nano-technology ,Selectivity - Abstract
SiO 2 nanoparticles offer promising prospects as additives for the synthesis of organic–inorganic hybrid composite membranes due to their facile synthesis procedure with low cost and toxicity to aqueous systems. This requires silica nanoparticles with good monodispersity to form a regular hydrophilic surface. In this study, monodisperse silica synthesized by the Stober method was explored as an additive in ultralow concentration for the synthesis of organic–inorganic composite membranes based on polyethersulfone, aiming at potential application in water treatment. The results indicate the polyethersulfone membrane doped with monodisperse silica has an enhanced performance. The hydrophilicity of the modified membranes was also enhanced due to the high water affinity of nano-SiO 2 , resulting in a higher permeability. However, in the high concentration interval of nano-SiO 2 , the permeability of modified membranes decreases due to pore plugging and the alteration of macrovoids in the sublayer of membranes. Simultaneously, the selectivity of the modified membranes was improved, which is an indicator for a more narrow pore size. The optimum permselectivity was obtained with the addition of 0.30% nano-silica. Additionally, the fouling resistance increased by ca. 70%. Thus, doping of nano-silica in the membranes is an alternative method to enhance permselectivity and fouling property for water treatment.
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- 2016
48. Tight ultrafiltration membranes for enhanced separation of dyes and Na2SO4 during textile wastewater treatment
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Marian Cornel Baltaru, Wenyuan Ye, Peng Gao, Arcadio Sotto, Stefan Balta, Alexander Volodin, Patricia Luis, Nicole J. Bernstein, Yu Pan Tang, Jiuyang Lin, Andrew L. Zydney, Maria Vlad, and Bart Van der Bruggen
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Chromatography ,Ultrafiltration ,Filtration and Separation ,02 engineering and technology ,010501 environmental sciences ,021001 nanoscience & nanotechnology ,01 natural sciences ,Biochemistry ,Desalination ,Congo red ,chemistry.chemical_compound ,Membrane ,chemistry ,Wastewater ,Osmotic pressure ,General Materials Science ,Nanofiltration ,Physical and Theoretical Chemistry ,0210 nano-technology ,0105 earth and related environmental sciences ,Concentration polarization - Abstract
Nanofiltration (NF) membranes have been used previously for the recovery of dyes, salts, and water from textile wastewaters with high salinity. However, commercially available NF membranes have a high rejection for divalent salts (i.e., Na2SO4), substantially reducing the salt recovery and membrane flux when treating textile wastewater containing Na2SO4. In this study, a tight ultrafiltration membrane (UH004, Microdyn-Nadir) was proposed to fractionate the dye and Na2SO4 in the textile wastewater. The UH004 membrane with a molecular weight cutoff of 4700 Da provided complete passage of monovalent salts, with little rejection of Na2SO4. This significantly increases the filtrate flux that can be achieved with high-salinity wastewater since osmotic pressure and concentration polarization effects are minimized. Furthermore, the retention behavior of four different dyes was evaluated to determine the efficiency of this membrane process. This tight ultrafiltration membrane offered the high retention for direct dyes (i.e., direct red 80, direct red 23, and Congo red) and reactive blue 2. For instance, the UH004 membrane yielded >98.9% rejection for all of the dyes at a pressure of 4 bar even in the presence of 60 g L−1 Na2SO4. Subsequently, an ultrafiltration-diafiltration process was designed to separate a dye/Na2SO4 aqueous mixture with 98% desalination efficiency and greater than 97% dye recovery after 5 diavolumes. These results clearly demonstrate that tight ultrafiltration membranes can be a stand-alone alternative to NF membranes for the effective fractionation of dye and Na2SO4 in the direct treatment of high-salinity textile wastewater.
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- 2016
49. Novel Composite Anion Exchange Membranes Based on Quaternized Polyepichlorohydrin for Electromembrane Application
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Jiefeng Pan, Mali Zhou, Arcadio Sotto Díaz, Jian Li, Jiangnan Shen, Bo Han, Bart Van der Bruggen, Shanshan Yang, and Congjie Gao
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Ion exchange ,Chemistry ,General Chemical Engineering ,Composite number ,Analytical chemistry ,02 engineering and technology ,General Chemistry ,DABCO ,Electrodialysis ,010402 general chemistry ,021001 nanoscience & nanotechnology ,01 natural sciences ,Industrial and Manufacturing Engineering ,0104 chemical sciences ,chemistry.chemical_compound ,Membrane ,Chemical engineering ,Copolymer ,Thermal stability ,Fourier transform infrared spectroscopy ,0210 nano-technology - Abstract
A series of semi-interpenetrating polymer network (sIPN) composite anion exchange membranes were fabricated depending on immobilized linear PVDF and cross-linked polyepichlorohydrin (PECH), 1,4-diazabicyclo[2.2.2]octane, (DABCO) network through in situ synthetic pathway. A cyclic diamine (DABCO) was used as cross-linking agent and simultaneously improved the ion-exchange capacity by amination. Scanning electron microscopy (SEM) indicated that the composite membranes exhibited a dense and homogeneous structure. Successful formation of PECH-DABCO copolymer within the sIPN membranes was also confirmed by Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The PVDF percentage and inherent properties of membranes such as ion exchange capacity (IEC), water uptake (WR), thermal stability, mechanical property, and area resistance were investigated to evaluate their applicability in electrodialysis (ED). The experimental results showed that the composite membrane maintained a good perspec...
- Published
- 2016
50. Preparation of loose polypiperazine amide membranes. Effect of the nanocomposite sublayer on the NF process performance
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Riitta L. Keiski, Serena Molina, Junkal Landaburu-Aguirre, Jesús M. Arsuaga, Eloy García-Calvo, and Arcadio Sotto
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Materials science ,Nanocomposite ,General Chemical Engineering ,Nanoparticle ,02 engineering and technology ,General Chemistry ,021001 nanoscience & nanotechnology ,Interfacial polymerization ,Industrial and Manufacturing Engineering ,Contact angle ,Membrane ,020401 chemical engineering ,Chemical engineering ,Thin-film composite membrane ,Polymer chemistry ,Environmental Chemistry ,Nanofiltration ,0204 chemical engineering ,Thin film ,0210 nano-technology - Abstract
Novel nanofiltration (NF) membranes were prepared by interfacial polymerization using four different nanocomposite membranes as sublayers. The nanocomposite sublayers were prepared by immersion precipitation method, dispersing nanoparticles such as TiO 2 , SBA-15 and functionalized SBA-15 with carboxylic groups (SBA-15(COOH)). The physico-chemical properties of the sublayers were studied by means of cross section morphology, pore diameter, pore density, contact angle and roughness by SEM and FEG-SEM. The successful incorporation of the thin film layer was evaluated by FT-IR. The addition of the nanoparticles increased the pore density and hydrophilic character of the ultrafiltration (UF) sublayers. Results showed that the nanocomposite sublayers can improve the process performance of the thin film composite membrane. In this study, the most significant performance improvement was observed on the NF with SBA-15(COOH) doped sublayer, achieving permeability values in the UF range (56.3 dm 3 /m 2 hbar) and successful MgSO 4 rejection coefficients (68.3%). Results also show that there is no strong influence between the physical parameters of the sublayers and NF process performance. Therefore, it was concluded that the COOH functional group of the nanoparticle SBA-15(COOH) might have interfered in the interfacial polymerization process, leading to more permeable and selective NF membranes.
- Published
- 2016
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