Insight to ternary complexes of co-adsorption of norfloxacin and Cu(II) onto montmorillonite at different pH using EXAFS

Zhi-Guo Pei; Xiao-Quan Shan; Shu-Zhen Zhang; Jing-Jing Kong; Bei Wen; Jing Zhang; Li-Rong Zheng; Ya-Ning Xie; Koen Janssens

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Insight to ternary complexes of co-adsorption of norfloxacin and Cu(II) onto montmorillonite at different pH using EXAFS

机译：使用EXAFS考察不同pH下诺氟沙星和Cu（II）在蒙脱土上共吸附的三元配合物

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Co-adsorption of norfloxacin (Nor) and Cu(II) on montmorillonite at pH 4.5, 7.0 and 9.0 was stud ied by integrated batch adsorption experiments and extended X-ray absorption fine structure (EXAFS) spectroscopy. Under such pH conditions the dominant species of Nor are cation (Nor~+), zwitterion (Nor~±), and anion (Nor~-), respectively. Results indicated that Nor sorption decreased with an increase of solution pH. The presence of Cu(II) slightly suppressed the Nor~+ sorption at pH 4.5, while increased Nor~+ and Nor~- sorption on montmorillonite at pH 7.0 and 9.0, respectively. In contrast, Nor increased Cu(II) adsorption at pH 4.5, but had little effect on the adsorption of Cu(II) on montmorillonite at pH 7.0 and 9.0. Spectroscopic results showed that, at pH 4.5, Nor~+ was sorbed on montmorillonite by the formation of outer-sphere montmorillonite-Nor-Cu(II) ternary surface complex. At pH 7.0, montmorillonite-Nor-Cu(II) and montmorillonite-Cu(II)-Nor ternary surface complexes co-exist. At pH 9.0, montmorillonite-Cu(II)-Nor ternary surface complex was likely formed, which was different to Cu(II)(Nor)_2 precipitate of the solution.

机译：通过整体间歇吸附实验和扩展的X射线吸收精细结构（EXAFS）光谱研究了诺氟沙星（Nor）和Cu（II）在pH 4.5、7.0和9.0的蒙脱石上的共吸附。在这种pH条件下，Nor的主要种类分别是阳离子（Nor〜+），两性离子（Nor〜±）和阴离子（Nor〜-）。结果表明，Nor吸附随着溶液pH值的增加而降低。 Cu（II）的存在在pH 4.5时略微抑制了Nor〜+吸附，而在pH 7.0和9.0时分别增加了对蒙脱石的Nor〜+和Nor〜-吸附。相比之下，在pH值为4.5时，Cu（II）的吸附也没有增加，但在pH值为7.0和9.0时，对Cu（II）在蒙脱土上的吸附几乎没有影响。光谱结果表明，在pH值为4.5时，通过形成外层蒙脱土-Nor-Cu（II）三元表面配合物，Nor〜+被吸附在蒙脱石上。在pH 7.0下，蒙脱土-Nor-Cu（II）和蒙脱土-Cu（II）-Nor三元表面复合物共存。在pH 9.0时，可能形成蒙脱土-Cu（II）-Nor三元表面复合物，这与溶液中的Cu（II）（Nor）_2沉淀不同。

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来源
《Journal of Hazardous Materials》 |2011年第1期|p.842-848|共7页
作者
Zhi-Guo Pei; Xiao-Quan Shan; Shu-Zhen Zhang; Jing-Jing Kong; Bei Wen; Jing Zhang; Li-Rong Zheng; Ya-Ning Xie; Koen Janssens;
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作者单位

State Key Laboratory of Environmental Chemistry and Ecotoxkology, Research Center for Eco-Environmental Sciences. Chinese Academy of Sciences, P.O. Box 2871. Beijing 100085, China;

State Key Laboratory of Environmental Chemistry and Ecotoxkology, Research Center for Eco-Environmental Sciences. Chinese Academy of Sciences, P.O. Box 2871. Beijing 100085, China;

State Key Laboratory of Environmental Chemistry and Ecotoxkology, Research Center for Eco-Environmental Sciences. Chinese Academy of Sciences, P.O. Box 2871. Beijing 100085, China;

State Key Laboratory of Environmental Chemistry and Ecotoxkology, Research Center for Eco-Environmental Sciences. Chinese Academy of Sciences, P.O. Box 2871. Beijing 100085, China,School of Chemistry and Materials. Fujian Normal University. Fuzhou 350007, China;

State Key Laboratory of Environmental Chemistry and Ecotoxkology, Research Center for Eco-Environmental Sciences. Chinese Academy of Sciences, P.O. Box 2871. Beijing 100085, China;

Beijing Synchrotron Radiation Laboratory. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

Beijing Synchrotron Radiation Laboratory. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

Beijing Synchrotron Radiation Laboratory. Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

Center for Micro- and Trace-Analysis, Department of Chemistry, University of Antwerp, Universiteisplein 1, Antwerp B-2610, Belgium;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种 eng
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关键词
sorption; copper; norfloxacin; EXAFS; montmorillonite;

机译：吸附铜;诺氟沙星EXAFS;蒙脱石;

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Insight to ternary complexes of co-adsorption of norfloxacin and Cu(II) onto montmorillonite at different pH using EXAFS

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