| 紫根水葫芦基活性炭吸附氧氟沙星-铜特性及机理研究 |
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| 引用本文： | 陈鑫,魏志远,赵翰斌,武广哲,刘莉莉.紫根水葫芦基活性炭吸附氧氟沙星-铜特性及机理研究[J].农业环境科学学报,2020,37(1):59-65. |
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| 作者姓名： | 陈鑫 魏志远 赵翰斌 武广哲 刘莉莉 |
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| 作者单位： | 华东理工大学资源与环境工程学院, 上海 200237;国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237,华东理工大学资源与环境工程学院, 上海 200237;国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237,华东理工大学资源与环境工程学院, 上海 200237;国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237,华东理工大学资源与环境工程学院, 上海 200237;国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237,华东理工大学资源与环境工程学院, 上海 200237;国家环境保护化工过程环境风险评价与控制重点实验室, 上海 200237 |
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| 基金项目： | 国家重点研发计划项目（2018YFC1901000）；国家自然科学基金项目（41771513，41001316） |
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| 摘 要： | 为解决目前抗生素与重金属复合污染问题，采用紫根水葫芦基活性炭（Long-root Eichhornia crassipes-activated carbon，LREC-AC）吸附水溶液中的氧氟沙星（Ofloxacin，OFL）和Cu2+，并对其吸附特性和机理等进行研究。结果表明，LREC-AC对OFL和Cu2+的吸附均符合Langmuir模型及拟二级动力学方程。LREC-AC对OFL的吸附机理包括电子供体-受体相互作用、氢键作用和静电引力作用，而对Cu2+的吸附机理则包括静电引力作用，以及电子交换或共价键等作用。在此基础上，考察OFL-Cu2+复合体系中LREC-AC对OFL和Cu2+吸附特性和机理。在复合体系中，LREC-AC对OFL和Cu2+的饱和吸附量分别为59.34 mg·g-1和37.46 mg·g-1。在OFL浓度为10 mg·L-1、Cu2+浓度<2 mg·L-1时，Cu2+可与OFL络合，从而促进LREC-AC对OFL的吸附。研究表明，LREC-AC可通过多种吸附机理共同作用有效去除水体中OFL和Cu2+，同时其对重金属和抗生素复合污染也具有良好的吸附性能。
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| 关 键 词： | 紫根水葫芦，活性炭，氧氟沙星，铜，复合污染，吸附 |
| 收稿时间： | 2019/4/8 0:00:00 |
Adsorption characteristics and mechanisms of ofloxacin-Cu by activated carbon based on long-root Eichhornia crassipes |
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| CHEN Xin,WEI Zhi-yuan,ZHAO Han-bin,WU Guang-zhe and LIU Li-li.Adsorption characteristics and mechanisms of ofloxacin-Cu by activated carbon based on long-root Eichhornia crassipes[J].Journal of Agro-Environment Science( J. Agro-Environ. Sci.),2020,37(1):59-65. |
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| Authors: | CHEN Xin WEI Zhi-yuan ZHAO Han-bin WU Guang-zhe and LIU Li-li |
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| Institution: | School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China,School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China,School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China,School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China and School of Resource and Environmental Engineering, East China University of Science and Technology, Shanghai 200237, China;State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, Shanghai 200237, China |
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| Abstract: | In order to solve the problem of combined antibiotics and heavy metal pollution, long-root Eichhornia crassipes-activated carbon (LREC-AC)was used to adsorb ofloxacin(OFL) and Cu2+ in aqueous system. Multiple experiments were conducted to investigate the adsorption characteristics and mechanisms of LREC-AC for OFL and Cu2+. Both the adsorption of OFL and Cu2+ by LREC-AC conformed to the Langmuir and pseudo-second-order model. Multiple mechanisms co-existed in the absorption of OFL and Cu2+ by LREC-AC. The adsorption mechanism of OFL by LREC-AC included electron-donor-acceptor interaction, hydrogen bonds, and electrostatic attraction, while the adsorption mechanism of Cu2+ included electrostatic attraction and electronic exchange or covalent bonds. On this basis, the adsorption characteristics and mechanisms of OFL and Cu2+ by LREC-AC in a compound system were further investigated. The saturated adsorption capacities in the compound system were 59.34 mg·g-1 and 37.46 mg·g-1 for OFL and Cu2+, respectively. In addition, OFL concentration of 10 mg·L-1, Cu2+(<2 mg·L-1) promoted the adsorption of OFL by LREC-AC because of the complexation of Cu2+ and OFL. LRECAC can effectively remove OFL and Cu2+ from aqueous system through a variety of adsorption mechanisms. At the same time, LREC-AC has good adsorption performance for combined heavy metal and antibiotics pollution. |
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| Keywords: | long-root Eichhornia crassipes activated carbon ofloxacin Cu combined pollution adsorption |
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