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Factors influencing antibiotics adsorption onto engineered adsorbents
作者姓名:Mingfang Xi  Aimin Li  Zhaolian Zhu  Qin Zhou  Weiben Yang
作者单位:State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;General Office of Lake Taihu Water Pollution Prevention and Control of Jiangsu Province, Nanjing 210024, China;State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, China
基金项目:We gratefully acknowledge generous support provided by the Key Subject of National Natural Science,the National Natural Science Foundation of China,the Jiangsu Nature Science Fund for Distinguished Scientists
摘    要:The study evaluated the adsorption of two antibiotics by four engineered adsorbents (hypercrosslinked resin MN-202, macroporous resin XAD-4, activated carbon F-400, and multi-walled carbon nanotubes (MWCNT)) from aqueous solutions. The dynamic results demonstrated the dominant influence of pore size in adsorption. The adsorption amounts of antibiotics on XAD-4 were attributed to the hydrophobic effect, whereas steric hindrance or micropore-filling played a main role in the adsorption of antibiotics by F-400 because of its high microporosity. Aside from F-400, similar patterns of pH-dependent adsorption were observed, implying the importance of antibiotic molecular forms to the adsorption process for adsorbents. Increasing the ionic concentration with CaCl2 produced particular adsorption characteristics on MWCNT at pH 2.0 and F-400 at pH 8.0, which were attributed to the highly available contact surfaces and molecular sieving, respectively. Its hybrid characteristics incorporating a considerable portion of mesopores and micropores made hypercross linked MN-202 a superior antibiotic adsorbent with high adsorption capacity. Furthermore, the adsorption capacity of MWCNT on the basis of surface area was more advantageous than that of the other adsorbents because MWCNT has a much more compact molecular arrangement.

关 键 词:吸附剂  抗生素  影响因素  工程  多壁碳纳米管  XAD-4树脂  接触表面  吸附能力
收稿时间:2012/10/18 0:00:00
修稿时间:2013/1/24 0:00:00

Factors influencing antibiotics adsorption onto engineered adsorbents
Mingfang Xi,Aimin Li,Zhaolian Zhu,Qin Zhou,Weiben Yang.Factors influencing antibiotics adsorption onto engineered adsorbents[J].Journal of Environmental Sciences,2013,25(7):1291-1299.
Authors:Mingfang Xi  Aimin Li  Zhaolian Zhu  Qin Zhou and Weiben Yang
Institution:1. State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China;General Office of Lake Taihu Water Pollution Prevention and Control of Jiangsu Province, Nanjing 210024, China
2. State Key Laboratory of Pollution Control and Resources Reuse, School of the Environment, Nanjing University, Nanjing 210093, China
3. School of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, China
Abstract:The study evaluated the adsorption of two antibiotics by four engineered adsorbents (hypercrosslinked resin MN-202, macroporous resin XAD-4, activated carbon F-400, and multi-walled carbon nanotubes (MWCNT)) from aqueous solutions. The dynamic results demonstrated the dominant influence of pore size in adsorption. The adsorption amounts of antibiotics on XAD-4 were attributed to the hydrophobic effect, whereas steric hindrance or micropore-filling played a main role in the adsorption of antibiotics by F-400 because of its high microporosity. Aside from F-400, similar patterns of pH-dependent adsorption were observed, implying the importance of antibiotic molecular forms to the adsorption process for adsorbents. Increasing the ionic concentration with CaCl2 produced particular adsorption characteristics on MWCNT at pH 2.0 and F-400 at pH 8.0, which were attributed to the highly available contact surfaces and molecular sieving, respectively. Its hybrid characteristics incorporating a considerable portion of mesopores and micropores made hypercross linked MN-202 a superior antibiotic adsorbent with high adsorption capacity. Furthermore, the adsorption capacity of MWCNT on the basis of surface area was more advantageous than that of the other adsorbents because MWCNT has a much more compact molecular arrangement.
Keywords:adsorption  resin  carbon nanotubes  pore size  surface area
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