L-半胱氨酸改性氧化石墨烯去除水中Hg(Ⅱ)  

Removal of Hg(Ⅱ)from water by L-Cysteine modified graphene oxide

作　　者：赵博涵 林海英 冯庆革 朱奕帆 廖玉莲 ZHAO Bo-han;LIN Hai-ying;FENG Qing-ge;ZHU Yi-fan;LIAO Yu-lian(Key Laboratory of Environmental Protection,College of Resources,Environment and Materials,Guangxi University,Nanning 530004,China;Guangxi Bossco Environmental Protection Technology Co.,Ltd.,Nanning 530007,China)

机构地区：[1]广西大学资源环境与材料学院广西高校环境保护重点实验室,广西南宁530004 [2]广西博世科环保科技股份有限公司,广西南宁530007

出　　处：《应用化工》2021年第4期991-996,共6页Applied Chemical Industry

基　　金：广西自然科学基金项目(2020GXNSFAA297011);广西重点研发计划(桂科AB18126075,桂科AA17204066,桂科AA17129001);广西大学科研基金(XJZ160939);博士启动基金(XBZ170327);广西博世科环保科技股份有限公司国家企业技术中心开放基金。

摘　　要：通过简单一步合成法,以L-半胱氨酸(L-Cysteine)作为改性剂,合成了工业级半胱氨酸功能化氧化石墨烯吸附剂L-Cysteine-GO。考察了不同条件下L-Cysteine-GO对Hg(Ⅱ)吸附性能的变化,如pH、吸附剂投加量、接触时间等;通过FTIR、拉曼光谱和SEM等表征手段,以探究该材料的吸附性能及机理。实验结果表明,当初始Hg(Ⅱ)浓度为200 mg/L、pH为7、投加量为1 g/L、吸附时间为60 min、温度为25℃时,最大吸附量为160.71 mg/g。准二级动力学、Freundlich模型与微观表征结果提示吸附机理为巯基等官能团对Hg(Ⅱ)的化学键合、材料对汞的静电吸附作用,主要为多层化学吸附。Graphene oxide modified with L-Cysteine(L-Cysteine-GO)was prepared by one-step synthesis with L-Cysteine as the modifying agent.The adsorption performance of L-Cysteine-GO on Hg(Ⅱ)was investigated at different factors such as pH,the dosage of material and contact time.FTIR,Raman spectroscopy and SEM were used to investigate the adsorption properties and mechanism of the materials.The results showed that the maximum adsorption capacity was 160.71 mg/g when the material was added into initial concentration of 200 mg/L at pH 7,at 25℃with the dosage of 1 g/L in 60 min.With combination of pseudo-second order kinetics,Freundlich model and material microstructure,it was suggested that the adsorption process can described to the chemical bonding of sulfhydryl groups and Hg(Ⅱ),electrostatic adsorption between material and Hg(Ⅱ),which was dominantly controlled by the multi-layer chemical adsorption.

关 键 词：氧化石墨烯 水中Hg(Ⅱ)的去除 L-半胱氨酸改性 一步合成法 吸附机理解析 

分 类 号：TQ424[化学工程]