【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2.31 mmol/g的巯基,AC-SH对汞的最大吸附容量高达556 mg/g;AC-SH的适用pH值范围非常广,在pH 1.5~10.5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-C l络合物。更多还原

【Abstract】 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.更多还原