巯基修饰的钛酸纳米管吸附汞  

Thiol-Modifiedtitanate Nanotubes for Adsorption of Hg^(2+)

作　　者：王成斌 李晓燕[2] 罗浩[2] 张升晓[2] 刘军深[2] 徐强[2] 李庆文[2] 

机构地区：[1]烟台市环境保护科学研究所有限公司,山东烟台264010 [2]鲁东大学化学与材料科学学院,山东烟台264039

出　　处：《鲁东大学学报（自然科学版）》2015年第3期244-247,259,共5页Journal of Ludong University:Natural Science Edition

基　　金：国家自然科学基金(21207059);山东省自然科学基金项目(ZR2011BQ012)

摘　　要：采用碱性水热法制备钛酸纳米管,再通过硅烷化反应在其表面修饰巯基.透射电镜和元素分析的表征结果表明巯基被成功的修饰到了钛酸纳米管的表面.基于巯基和Hg2+之间的"软—软"相亲作用,巯基修饰的钛酸纳米管(TNTs-SH)可用于水体中Hg2+的去除.在溶液p H为3~7的范围内,TNTs-SH对Hg2+的吸附没有明显的变化,表明该材料可以在酸性条件下有效的去除Hg2+.由Langmuir吸附等温模型拟合出Hg2+在TNTs-SH上的最大吸附量为134.23 mg/g,并且在较高的离子强度下,仍然保持了较高的吸附量.动力学研究表明Hg2+在TNTs-SH上的吸附过程符合二级反应动力学方程,吸附速率较快.The titanate nanotubes （TNTs） were prepared by alkaline hydrothermal method,and the surface of TNTs were modified by thiol groups through silanization reaction. Characterization with transmission electron microscope and elemental analysis proved that thiol groups were successfully grafted on TNTs. Based on the strong interaction between Hg2＋ and thiol groups,thiol groups modified TNTs （TNTs-SH） were applied for re-moval of Hg2＋from solution. When the solution pH ranged from 3 to 7,the adsorption capacity showed no obvi-ous variation,indicating that TNTs-SH could remove Hg2＋ effectively under acid condition. The maximum ad-sorption capacity calculated by Langmuir equation was 134. 23 mg / g at pH 6. 5,and TNTs-SH still maintained good adsorption capability in high salinity solution. The kinetic study showed that the adsorption of Hg2＋ on TNTs-SH fitted well with pseudo-second order kinetic equation,and adsorption rate was quite fast.

关 键 词：钛酸纳米管 巯基 Hg2+ 吸附 

分 类 号：Q647.33[生物学—生物物理学]