11 results on '"Ma, Hongrui"'
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2. Adsorptive Removal of Trivalent Chromium in Aqueous Solution Using Precipitate Produced from Aluminum Tanning Wastewater
- Author
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Ma, Hongrui, Hua, Li, Lian, Kunzhou, and Ma, Xiu
- Published
- 2014
- Full Text
- View/download PDF
3. Three-dimensional interconnected porous tablet ceramic: Synthesis and Pb(II) adsorption
- Author
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Ting Wei, Ya-ni Hei, Huan Li, and Ma Hongrui
- Subjects
Materials science ,chemistry.chemical_element ,Mineralogy ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,Adsorption ,Specific surface area ,General Materials Science ,Ceramic ,Porosity ,Zirconium ,Aqueous solution ,Mechanical Engineering ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,0104 chemical sciences ,Montmorillonite ,chemistry ,Chemical engineering ,Mechanics of Materials ,visual_art ,visual_art.visual_art_medium ,0210 nano-technology ,Porous medium - Abstract
A novel porous tablet material (PTM) was developed from zirconium pillared montmorillonite (Zr-MMT) by dry pressing technique combined with sacrificial template (polymethylmethacrylate). The developed PTM can be effectively separated from water. The layered structure of montmorillonite was still intact and the three-dimensional interconnected porosity of PTM was evenly distributed, which means that PTM has good permeability. The specific surface area and total pore volume of PTM were 80.04 m 2 /g and 0.28 m 3 /g, respectively, indicating that the PTM can provide a large number of vacant surface active sites. The saturated adsorption capacity to Pb(II) was 215.52 mg/g, which was much higher than that of montmorillonite type clay adsorbents. These findings demonstrate that PTM could be used as separable adsorbent for Pb(II) removal from aqueous solution.
- Published
- 2017
4. Fabrication of zirconium-pillared montmorillonite porous ceramic as adsorbents for Cr 3+ removal and recycling
- Author
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Li Hua, Xian-rong Qiao, Yu-zhu Yang, Cheng-Long Yu, Ying-yan Guo, Ma Hongrui, and Ya-ni Hei
- Subjects
Fabrication ,Materials science ,Mineralogy ,chemistry.chemical_element ,02 engineering and technology ,010402 general chemistry ,01 natural sciences ,chemistry.chemical_compound ,symbols.namesake ,Adsorption ,X-ray photoelectron spectroscopy ,Materials Chemistry ,Porosity ,Zirconium ,Process Chemistry and Technology ,Langmuir adsorption model ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Surfaces, Coatings and Films ,Electronic, Optical and Magnetic Materials ,Porous ceramics ,Montmorillonite ,chemistry ,Chemical engineering ,Ceramics and Composites ,symbols ,0210 nano-technology - Abstract
A novel zirconium-pillared montmorillonite (Zr-Mt) porous ceramic (P-ZMt) for Cr 3+ removal was developed by gelcasting. P-ZMt was characterized by XRD, SEM, XPS, TEM, BET. The influence of pH value, contact time, temperature and initial concentration on the adsorption efficiency was investigated. The results revealed that the P-ZMt has a high removal efficiency of Cr 3+ over a broad range of pH value. The pseudo-second-order kinetic model fitted our acquired Cr 3+ adsorption data best, in comparison with the pseudo-first-order kinetic model. The Langmuir model was applied to fit the adsorption process better than that of the Freundlich model. The thermodynamic parameters (∆H, ∆G and ∆S) were also determined, which revealed that the Cr 3+ adsorption process was spontaneous in nature. The present developed P-ZMt could be recovered and reused for more than 6 times. The novel developed P-ZMt is an inexpensive, effective and long-life-cycle adsorbent for Cr 3+ removal from water solution.
- Published
- 2016
5. Notice of Retraction: Study on Characteristics of Cr(III) Removal by Fly Ash in Aqueous Solution
- Author
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Dang Nan, Ma Hongrui, and Fan Chunhui
- Subjects
Pollution ,Aqueous solution ,Waste management ,media_common.quotation_subject ,chemistry.chemical_element ,Chromium ,Adsorption ,chemistry ,Wastewater ,Fly ash ,Desorption ,Leaching (metallurgy) ,media_common ,Nuclear chemistry - Abstract
The leaching characteristics of harmful elements, mainly heavy metals, from fly ash in aqueous solution were analyzed, and fly ash was used as adsorbent to remove Cr(III) in aqueous solution, affecting factors were studied to optimize operation conditions. Desorption effect was checked as well. The results showed that the lixivium of fly ash was alkaline, 7 kinds of metals with different concentrations were detected in solution, and concentration of leaching elements were lower than those of state standard GB5085-85 and GB8978-88 except for pH value. It was safe in aqueous solution without excessive harmful pollution. Fly ash was effective to remove Cr(III), and the operation conditions could affect adsorption capacity to some extent. The optimal environmental condition was of pH 4.5, dosage of fly ash 0.2 g, concentration of Cr(III) 20 mg/L. The temperature affect little on adsorption process, normal temperature is acceptable. Adsorption process was fast and the adsorption capacity was 14.95 mg/g at 10 min, and the maximum desorption rate was 93.0%. The result is of great significance for adsorption mechanism investigation and practical application in future.
- Published
- 2011
6. Adsorptive removal of vinyl polymer tanning agents from aqueous solution using wastewater activated sludge.
- Author
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Zhao, Xia, Ma, Jianzhong, Ma, Hongrui, Gao, Dangge, Lv, Xiangfei, and Zhang, Jing
- Subjects
ADSORPTIVE separation ,ACTIVATED sludge process ,BIOLOGICAL nutrient removal ,BIOREMEDIATION ,VINYL polymers - Abstract
Adsorptive studies were carried out on four synthetic vinyl polymer tanning agents removal from aqueous phase onto wastewater activated sludge (AS). Batch experiments investigated the effects of contact time, dosage of adsorbate, extracellular polymeric substances (EPS), coexisted cations, and physical property of sludge flocs on the four vinyl polymers removal by AS to evaluate the kinetics, isotherms, and mechanisms. Almost 96% of polydiallyldimethylammonium chloride-acrylic-acrylamide (PDM-AA-AM), 90% of polydiallyldimethylammonium chloride-acrylic (PDM-AA), 82% of polydiallyldimethylammonium chloride-acrylic-acrylamide-hydroxyethyl acrylate (PDM-AA-AM-HEA), and 56% of polydiallyldimethylammonium chloride (PDM) were removed from aqueous solutions. The kinetics process of adsorption can be described by the pseudo-second-order kinetic equation and the adsorption isotherms fitted to the Langmuir model very well. The adsorption capacity increases with the increase in initial vinyl polymers concentration. Coexisted cations (Ca2+, Na+) in aqueous solution restrained vinyl polymers adsorption on AS. The presence of Cr3+ions slightly improved the PDM-AA, PDM-AA-AM, and PDM-AA-AM-HEA removal, whereas retarded the PDM removal in some extent. AS are more effective than inactivated sludge in the removal of vinyl polymers. All the four vinyl polymers showed a decrease in the degree of removal when EPS was partial extracted from the biomass. The adsorption mechanisms of AS for vinyl polymers included hydrophobic interaction, surface binding, and electrostatic force. Surface binding may play a major role in PDM-AA, PDM-AA-AM, and PDM-AA-AM-HEA adsorption, while electrostatic interaction may play a major role in PDM removal. This study provided strong evidence that AS can be employed for an effective solution for vinyl polymers syntans removal. [ABSTRACT FROM PUBLISHER]
- Published
- 2016
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7. Adsorption of Cr(VI) from aqueous solution onto short-chain polyaniline/palygorskite composites.
- Author
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Wang, Jiahong, Han, Xiaojing, Ji, Yanfen, and Ma, Hongrui
- Subjects
ADSORPTION (Chemistry) ,AQUEOUS solutions ,POLYANILINES ,PALYGORSKITE ,HEXAVALENT chromium - Abstract
Hexavalent chromium in aqueous environment may result in severe environmental and public health problems. In this study, short-chain polyaniline/palygorskite composites (PANI/PA) were prepared and developed to remove aqueous Cr(VI). Characterized results showed that short-chain polyaniline was successfully incorporated on the surface of PA. The maximum Cr(VI) adsorption amount was found to be 11.54, 14.34, and 16.22 mg/g at 15, 25, and 35°C, respectively, and polyaniline on the adsorbent surface may account for the enhanced Cr(VI) adsorption. Cr(VI) adsorption was highly dependent on both solution pH and ionic strength, which indicates that electrostatic force and anion exchange may account for the increased Cr(VI) adsorption onto PANI/PA. Cr(VI) saturated PANI/PA can be easily desorbed in alkaline solution and regenerated adsorbents still possess high adsorption amount for aqueous Cr(VI). The current study shows that PANI/PA can be used as an effective and recyclable adsorbent for the removal of Cr(VI) in water and wastewater treatment. [ABSTRACT FROM PUBLISHER]
- Published
- 2015
- Full Text
- View/download PDF
8. Adsorptive removal of vinyl polymer/ZnO nanocomposite from aqueous solution by activated sludge biomass.
- Author
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Zhao, Xia, Ma, Hongrui, Ma, Jianzhong, Gao, Dangge, Hu, Lizhen, and Lv, Xiangfei
- Subjects
AQUEOUS solutions ,VINYL polymers ,ZINC oxide ,ACTIVATED sludge process ,ADSORPTION (Chemistry) - Abstract
In this study, the removal potential of vinyl polymer/ZnO nanocomposite (PDM/ZnO) by activated sludge (AS) biomass was investigated. PDM/ZnO was effectively removed by AS adsorption (90.3% of total PDM/ZnO removed). The effects of contact time, temperature, pH of the solution, PDM/ZnO production method, initial adsorbate concentration, and properties of the adsorbent were studied. The experimental results are fitted with the Langmuir and Freundlich equations. The adsorption kinetics closely followed the pseudo-second-order model. Thermodynamic parameters (ΔH°, ΔS°, ΔG°) indicate that the adsorption of PDM/ZnO onto AS was feasible, spontaneous, and endothermic. The effects of PDM/ZnO production method and pH value both indicate that electrostatic force may main mechanism in PDM/ZnO adsorption process. The decrease in the adsorption capacity of inactivated sludge suggests that the increase of adsorbent surface area also plays a significant role in the removal process. [ABSTRACT FROM PUBLISHER]
- Published
- 2015
- Full Text
- View/download PDF
9. Removal of polyacrylate in aqueous solution by activated sludge: Characteristics and mechanisms.
- Author
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Zhao, Xia, Ma, Jianzhong, Ma, Hongrui, Gao, Dangge, Sun, Yonghui, and Guo, Chunxiu
- Subjects
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POLYACRYLATES , *POLYMERS , *AQUEOUS solutions , *ADSORPTION (Chemistry) , *SCANNING electron microscopy - Abstract
The aim of this study is to evaluate the removal potential of polyacrylate in aqueous solution by activated sludge. Batch experiments investigated the effects of contact time, pH value, temperature, and concentration of adsorbate on polyacrylate removal by activated sludge to evaluate the isotherms, kinetics, thermodynamics, and mechanisms. The materials were characterized by N 2 adsorption-desorption isotherms, scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), and Fourier transform infrared spectroscopy (FT-IR). The experimental results indicate that more than 90% of polyacrylate was removed by activated sludge in a short time. The adsorption capacity increase with the increase in initial polyacrylate concentration and temperature. Increasing pH value resulted in a decrease in adsorption capacity. The adsorption process fitted well to Langmuir isotherm and pseudo-second-order kinetic models. Thermodynamic parameters indicate that the adsorption of polyacrylate onto activated sludge was feasible, spontaneous, and endothermic. The results of kinetics, thermodynamics, SEM-EDS, and FT-IR showed that surface binding, hydrophobic interaction, and hydrogen bond force may play a major role in the removal process. Microbial community structure analysis by 16S rRNA gene revealed that short-term exposure with polyacrylate had a little negative impact on the activated sludge microorganisms. A better understanding of polyacrylate adsorption onto activated sludge is essential for improving predictions of the fate and transport of polyacrylate in waste water treatment process. [ABSTRACT FROM AUTHOR]
- Published
- 2018
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10. Adsorptive removal of humic acid from aqueous solution on polyaniline/attapulgite composite
- Author
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Wang, Jiahong, Han, Xiaojing, Ma, Hongrui, Ji, Yanfen, and Bi, Lijuan
- Subjects
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ADSORPTION (Chemistry) , *HUMIC acid , *SOLUTION (Chemistry) , *OXIDATION , *ANILINE , *FULLER'S earth , *COMPOSITE materials , *IMINES - Abstract
Abstract: Polyaniline/attapulgite composite (ATP–PANI) was prepared by in situ chemical oxidation and characterized by FITR, XRD, and TEM. Characterized results showed that polyaniline (PANI) was successfully encapsulated on the surface of attapulgite (ATP). Humic acid (HA) adsorption onto ATP–PANI was investigated by batch experiments and adsorption kinetic tests. In contrast with the low HA adsorption amount on ATP, substantially enhanced HA adsorption onto ATP–PANI was observed. Adsorption isotherms of HA can be well described by Langmuir model and the maximum adsorption amounts were found to be 43.01, 52.91, 61.35mg/g at 15, 25, and 35°C, respectively. HA adsorption increased with rise in temperature indicating of an endothermic process of HA adsorption onto ATP–PANI. Pseudo-second order kinetic equation can fit HA adsorption very well and the adsorption rate decreased with increasing initial HA concentration. HA adsorption decreased monotonously with increasing solution pH. Co-existed cations (Na+, K+, Ca2+) in aqueous solution improved HA adsorption amount on ATP–PANI, and the augment of HA adsorption amount was order as Ca2+ >K+ >Na+. Results of HA adsorption onto ATP–PANI showed that the electrostatic interaction between amine and imine groups of the adsorbents and HA molecules in solution may account for the enhanced HA adsorption. The HA molecules adsorbed on ATP–PANI can be effectively desorbed in 2M NaOH solution, and regenerated adsorbent can be repeatedly used in the subsequently four adsorption-regeneration cycles with little loss of HA adsorption amount. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
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11. Behaviors and mechanisms of tannic acid adsorption on an amino-functionalized magnetic nanoadsorbent
- Author
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Wang, Jiahong, Zheng, Changle, Ding, Shaolan, Ma, Hongrui, and Ji, Yanfen
- Subjects
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TANNINS , *ADSORPTION (Chemistry) , *MAGNETIC separation , *POLLUTANTS , *CHEMICAL kinetics , *HYDROGEN-ion concentration , *AMINO group , *SURFACES (Technology) - Abstract
Abstract: Tannic acid is known as one of the refractory organic pollutants in water. Amino-functionalized magnetic nanoadsorbent (Fe3O4@SiO2-NH2) exhibited high adsorption capacity for aqueous TA with maximum adsorption amount of 136.23mg/g at 25°C. TA adsorption on the adsorbent could be well described by Langmuir adsorption model and the adsorption process was endothermic. Furthermore, pseudo-second adsorption kinetics can fit TA adsorption data very well, and the adsorption rate decreased with increasing initial TA concentration. The presence of Na+, K+, and Ca2+ may result in enhanced TA adsorption. In addition, TA adsorption over the adsorbent was highly dependent on solution pH and the maximum adsorption amount was found to be at pH 6.0. The XPS analysis revealed that TA adsorption over the adsorbent may be attributed to the surface complexation between the amino groups of the adsorbent and TA in solution. The TA loaded adsorbent can be effectively desorbed in a 0.5M HCl solution, and the regenerated adsorbent can be recycled. [Copyright &y& Elsevier]
- Published
- 2011
- Full Text
- View/download PDF
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