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5 results on '"Ponceau 2R"'

2. Eletrodegradação de Ponceau 2R utilizando ânodos dimensionalmente estáveis e Ti/Pt

Author

Francisco Wirley Paulino Ribeiro, Sâmeque do Nascimento Oliveira, Pedro de Lima-Neto, Adriana Nunes Correia, Lúcia Helena Mascaro, Roberto de Matos, Ernesto Chaves Pereira de Souza, and Marcos Roberto de Vasconcelos Lanza

Subjects
Ponceau 2R, DSA, Ti/Pt, Chemistry, QD1-999
Abstract

This paper reports the electrochemical degradation of the azo dye Ponceau 2R under galvanostatic electrolysis in the 1 to 200 mA cm-2 range at room temperature using dimensionally-stable anodes of oxygen (DSA-O2), chlorine (DSA-Cl2) and a titanium electrode of platinum coated with platinum oxide (Ti/Pt). The methodology applied was efficient for removing the color of the Ponceau 2R and the highest percentage removal of total organic carbon was obtained at 200 mA cm-2. Despite not having been observed complete mineralization, approximately80% removal of aromatic rings was estimated, resulting in drastic reduction of toxicity of the sample.

Published
2013
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3. Electronic modulation of fiber-shaped-CoFe2O4 via Mg doping for improved PMS activation and sustainable degradation of organic pollutants.

Author

Niu, Ping, Li, Chunhui, Wang, Dunqing, Jia, Chunxiao, Zhao, Jing, Liu, Zhongmin, Zhang, Xiuling, and Geng, Longlong

Subjects
*ELECTRONIC modulation, *POLLUTANTS, *ELECTRON donors, *COBALT catalysts, *TRANSITION metal oxides, *CATALYTIC oxidation, *ELECTRONEGATIVITY
Abstract

As an ideal electron donor, the doping of Mg in CoFe 2 O 4 (MCFO-0.4) endows Co site with electron-rich character, which exhibits enhanced capability and high stability for PMS activation to generate 1O 2 and OH radicals, thus achieving outstanding activity, reusability and low metal leaching during Ponceau 2R degradation process. [Display omitted] • Mg-doped CoFe 2 O 4 (MCFO-0.4) were synthesized via a simple sol-gel strategy. • Mg acts as an electron donor endows Co sites with electron-rich property. • Outstanding activity and low metal leaching were achieved in MCFO-0.4/PMS system. • MCFO-0.4 was highly stable and effective in multiple cycles of Ponceau 2R degradation process. • 1O 2 and OH radicals were involved in the catalytic oxidation process. Advanced oxidation processes (AOPs) driven by transition metal oxides are promising systems for the removal of organic pollutants. However, the catalytic activity is still limited by the low redox property of the active site. In this study, a novel and robust fiber-shaped cobalt ferrite catalyst was synthesized through a magnesium doping strategy. Detailed structural characterization and theoretical calculations demonstrated that the doping of Mg into CoFe 2 O 4 maintains the spinel structure but increased the electron density of Co sites due to its similar atomic radius but different electronegativity to Co. Remarkably, the optimized MCFO-0.4 achieved superior capability for peroxymonosulfate (PMS) activation and outstanding performance for the catalytic degradation of Ponceau 2R (PR). Furthermore, the inherent crystal stability and magnetic nature of spinel allows for magnetically reusability and ultra-low cobalt leaching of MCFO-0.4. Radical quenching and EPR results confirmed the involvement of singlet oxygen and hydroxyl radicals during PMS activation, and a possible catalytic mechanism was finally proposed. This work provides a case study on microstructural regulation and electron modulation in spinel catalysts, which may provide now clues to further improve the activity of oxidation catalysts for large-scale wastewater treatment. [ABSTRACT FROM AUTHOR]

Published
2022
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4. An enhanced staining method K-B-2R staining for three-dimensional nerve reconstruction

Author

Yi Zhang, Jianghui Dong, Liping Wang, Jian Qi, Cory J. Xian, Yingchun Zhong, Xiaolin Liu, Peng Luo, Luo, Peng, Dong, Jianghui, Qi, Jian, Zhang, Yi, Liu, Xiaolin, Zhong, Yingchun, Xian, Cory J, and Wang, Liping

Subjects
Fascicle texture feature, Sensory system, Acetylcholinesterase staining, Three-dimensional reconstruction, Ponceau 2R, lcsh:RC321-571, 03 medical and health sciences, Cellular and Molecular Neuroscience, chemistry.chemical_compound, 0302 clinical medicine, Imaging, Three-Dimensional, acetylcholinesterase staining, medicine, Humans, Peripheral Nerves, Tolonium Chloride, lcsh:Neurosciences. Biological psychiatry. Neuropsychiatry, image segmentation, Thiocholine, Image segmentation, Nerve fascicle, Staining and Labeling, three-dimensional reconstruction, Chemistry, General Neuroscience, lcsh:QP351-495, fascicle texture feature, Anatomy, Counterstain, Median nerve, Staining, Peripheral nerve field, peripheral nerves, medicine.anatomical_structure, lcsh:Neurophysiology and neuropsychology, Printing, Three-Dimensional, Acetylcholinesterase, Indicators and Reagents, Azo Compounds, K-B-2R, 030217 neurology & neurosurgery, Sensory nerve, Research Article
Abstract

Background: Three-dimensional (3D) reconstruction of human peripheral nerves, as a useful tool to understand the nerve internal information and functional basis, has become an important area of research in the peripheral nerve field. Methods: In this study, we proposed a two-dimensional (2D) Karnovsky-Roots toluidine blue ponceau 2R (K-B-2R) staining method based upon conventional Karnovsky-Roots staining. It significantly improved the ability to display nerve fascicles, motor and sensory nerve fiber textures. In this method, Karnovsky-Roots staining was carried out, followed by toluidine blue counterstain and ponceau 2R counterstain. Results: Comparisons were conducted between the three methods in staining of median nerve sections, which showed similar distribution characters in acetylcholinesterase-positive sites. The additional counterstaining did not change the basis of Karnovsky-Roots staining. However, the resulting images from this new method significantly facilitated the subsequent 3D nerve reconstruction and 3D printing. Conclusions: These results show that the new staining method significantly enhanced the display qualities of nerve fascicle edges and fiber textures of motor and sensory nerves and facilitated 3D nerve reconstruction. usc Refereed/Peer-reviewed

Published
2019

5. Ligninolytic enzyme production and dye decolorization by Trametes trogii: application of the Plackett–Burman experimental design to evaluate nutritional requirements

Author

Flavia Forchiassin, Laura Noemí Levin, and A. Viale

Subjects
Laccase, Plackett–Burman design, Ligninolytic enzymes, Plackett-Burman design, White rot fungi, Xylidine, Manganese peroxidase activity, Bioengineering, Applied Microbiology and Biotechnology, Biochemistry, Anthraquinone, Ponceau 2R, Ciencias de la Tierra y relacionadas con el Medio Ambiente, Nutritional requirements, chemistry.chemical_compound, chemistry, Dye decolorization, Manganese peroxidase, Food science, Malachite green, Meteorología y Ciencias Atmosféricas, Trametes trogii, CIENCIAS NATURALES Y EXACTAS
Abstract

The effects of medium components on laccase, manganese peroxidase and glyoxal oxidase production by Trametes trogii (MYA 28-11) have been studied using Plackett–Burman (PB) experimental design. Copper had the highest positive influence on ligninolytic enzyme production. T. trogii extracellular fluids obtained in the medium which rendered the highest ligninolytic production (45.32 U/ml laccase, 214.5 mU/ml manganese peroxidase and 116 mU/ml glyoxal oxidase) also showed the greatest ability to decolorize the dyes Ponceau 2R (a xylidine derivative), malachite green and anthraquinone blue (at rates of 2.14, 1.35 mg and 3 mg dye/(ml h), respectively). The relationship among decolorization rates and ligninolytic enzyme activities was analyzed by multiple regression. The results fit a linear plus interactions model. The comparison of the response surfaces obtained, suggests that while laccase activity has a greater importance in xylidine degradation, manganese peroxidase activity plays the major role in malachite green decolorization. Fil: Levin, Laura Noemí. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Micología y Botánica. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Micología y Botánica; Argentina Fil: Forchiassin, Flavia. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Biodiversidad y Biología Experimental; Argentina Fil: Viale, A.. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Química Biológica; Argentina

Published
2005

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