聚马来酸酐树脂的制备及其对水中环丙沙星的吸附行为和机制  

Synthesis of a polymaleic anhydride based resin,and its adsorption characteristics and mechanisms for removal of ciprofloxacin from aqueous solutions

作　　者：董佳伟 刘雪虎 黎璋焰 董慧峪[2] 王莉敏 丁宁[3] 刁开盛 刘绍刚 DONG Jiawei;LIU Xuehu;LI Zhangyan;DONG Huiyu;WANG Limin;DING Ning;DIAO Kaisheng;LIU Shaogang(Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning 530008;Key Laboratory of Drinking Water Science and Technology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085;Department of Environmental Science and Engineering,Beijing Technology and Business University,Beijing 100048)

机构地区：[1]广西民族大学化学化工学院,广西林产化学与工程重点实验室,南宁530008 [2]中国科学院生态环境研究中心,中国科学院饮用水科学与技术重点实验室,北京100085 [3]北京工商大学环境科学与工程系,北京100048

出　　处：《环境科学学报》2021年第2期548-556,共9页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.21667004,21567004,21976040);2019年广西区研究生教育创新计划项目(No.YCSW2019134);北京工商大学2019年度实培计划项目;广西高等学校高水平创新团队及卓越学者资助计划(桂教人[2020]6号);广西区级大学生创新创业训练计划项目(No.201810608003,201810608004)。

摘　　要：通过沉淀聚合法合成聚马来酸酐树脂(Polymaleic Anhydride Resin,PMA),采用扫描电镜(SEM)、红外光谱(FTIR)、比表面分析(BET)和热重(TG)分析对PMA进行了表征.同时,利用PMA对水中环丙沙星(CPX)进行吸附去除,系统研究了原料配比、PMA投加量、pH、离子强度和温度等因素对CPX吸附性能的影响.结果表明,pH在2.0~5.0范围内,PMA对CPX的去除效果随着溶液pH的增加而快速升高,在5.0~10.0之间呈小幅下降趋势;离子强度的存在对PMA去除CPX的行为总体上表现为抑制作用;PMA对水中CPX的吸附动力学过程符合拟二级动力学模型;Langmuir等温吸附模型可较好地描述PMA对水中CPX的吸附过程,理论最大吸附量为77.06 mg·g^(-1)(pH=5.0、25℃);吸附热力学分析表明,PMA对水中CPX的吸附是自发吸热的过程,属于物理吸附;吸附再生实验表明,0.2 mol·L^(-1)NaOH溶液是PMA的优选洗脱液,经过5次吸附⁃脱附循环后,对CPX仍具有稳定的吸附性能,可多次循环使用;最后,利用化学计算从微观上明确PMA的羰基O与CPX的羧基H的氢键对吸附起主要作用,而静电引力对吸附性能影响很小.An polymaleic anhydride resin(PMA)was synthesized by precipitation polymerization and was characterized by using scanning electron microscopy(SEM),Fourier transform infrared spectroscopy(FTIR),surface area measurements(BET),and thermal gravimetric analyzer(TG).The effects of monomer ratios,resin dosage,pH,ionic strength and temperature on its adsorption performance for ciprofloxacin(CPX)were investigated by batch experiments.Results showed that its CPX adsorption capacity sharply increased with pH in the range from 2.0 to 5.0,but slightly decreased at higher pH(5.0~10.0).Its adsorption process for CPX follows a pseudo⁃second rate model(R^(2)>0.99)and could be fitted by the Langmuir isotherm,with calculated maximum monolayer adsorption capacity of 77.06 mg·g^(-1) at pH=5.0 and 25℃.Thermodynamic calculations show that the adsorption of CPX was a spontaneous and endothermic process.Furthermore,the PMA that adsorbed CPX could be efficiently regenerated by 0.2 mol·L^(-1)NaOH.After five adsorption⁃desorption recycles,PMA had a stable adsorption performance and could be recycled.Finally,chemical calculations show that the hydrogen bonding between the carbonyl oxygen of PMA and carboxyl hydrogen of CPX plays an important role in adsorption processes,while the static force is insignificant to affect the adsorption processes.

关 键 词：聚马来酸酐树脂 环丙沙星 吸附 作用机制 

分 类 号：X703[环境科学与工程—环境工程]