紫根水葫芦基活性炭吸附氧氟沙星-铜特性及机理研究

陈鑫; 魏志远; 赵翰斌; 武广哲; 刘莉莉

文章摘要

紫根水葫芦基活性炭吸附氧氟沙星-铜特性及机理研究

Adsorption characteristics and mechanisms of ofloxacin-Cu by activated carbon based on long-root Eichhornia crassipes

Received:April 08, 2019

DOI：10.13254/j.jare.2019.0175

中文关键词: 紫根水葫芦，活性炭，氧氟沙星，铜，复合污染，吸附

英文关键词: long-root Eichhornia crassipes, activated carbon, ofloxacin, Cu, combined pollution, adsorption

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）

Author Name	Affiliation	E-mail
CHEN Xin	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
WEI Zhi-yuan	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
ZHAO Han-bin	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
WU Guang-zhe	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
LIU Li-li	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	lilyliu@ecust.edu.cn

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中文摘要:

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。

英文摘要:

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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