巯基改性活性炭对水溶液中汞的吸附性能研究  

Investigation on aqueous Hg(Ⅱ) adsorption properties by thiol-modified activated carbon

作　　者：王静[1] 陈光辉[1] 陈建[1] 陶仙聪[2] 郑建中[1] 

机构地区：[1]南京大学环境学院,污染控制与资源化研究国家重点实验室,南京210093 [2]南京大学现代分析中心,南京210093

出　　处：《环境工程学报》2009年第2期219-222,共4页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(20377021)

摘　　要：利用活性炭与巯基乙酸间的酯化反应，制备了巯基改性活性炭AC-SH，并通过静态吸附实验研究了该材料对水溶液中汞的吸附性能。研究结果表明，该改性方法可以在活性炭上嫁接2．31mm01／g的巯基，AC—SH对汞的最大吸附容量高达556mg／g；AC—SH的适用pH值范围非常广，在pH1．5～10．5范围内其对汞的吸附去除率均达到90％以上，最佳吸附pH值范围为3～7；氯离子对AC—SH的吸附性能具有一定的抑制作用，原因在于它能和汞离子络合形成一系列吸附性能较差的Hg—CI络合物。A thiol-modified activated carbon （AC-SH） was prepared by esterification between thioacetic acid and oxygen-containing functional groups on activated carbon （AC）. Aqueous Hg（Ⅱ ） adsorption properties by AC-SH were studied through batch experiments. Results showed that 2. 31 mmol/g thiol was grafted onto AC, and the Qmax was increased to 556 mg/g. The optimal pH for Hg adsorption was in the range of 3 - 7, although the removal rate was generally over 90% in a wide range of pH tested （1.5 - 10.5）. The existence of Cl- in water can significantly decrease Hg（Ⅱ ） adsorption due to the formation of Hg-Cl complex, which has relatively low affinity to AC-SH.

关 键 词：活性炭 巯基 汞 吸附 络合 

分 类 号：X703[环境科学与工程—环境工程]