氨基硅烷偶联剂改性凹凸棒土的制备及其吸附性能  

Preparation and Adsorption Activities of Attapulgite Modified by Amino-silane Coupling Agent

作　　者：朱维菊[1] 高华[1] 李村[1] 吴振玉[1] 方敏[1] 

机构地区：[1]安徽大学化学化工学院,合肥230039

出　　处：《应用化学》2012年第2期180-185,共6页Chinese Journal of Applied Chemistry

基　　金：安徽高校省级自然科学研究项目(KJ2009A103);安徽省自然科学研究项目(11040606M33)

摘　　要：采用双氨基硅烷偶联剂KH-792对盐酸改性凹凸棒土(HATT)进行改性,使用FTIR、TGA、DSC、XRD和BET等对目标产物(KHATT)进行了表征。研究了KHATT对模拟水样中Cr(Ⅵ)的吸附性能,系统考察了模拟水样中Cr(Ⅵ)的初始浓度、pH值、吸附时间及KHATT用量等因素对Cr(Ⅳ)去除率的影响。结果表明,在KHATT用量为3 g/L、吸附时间为40 min、pH值为5.5的条件下,KHATT对Cr(Ⅵ)的去除率最高,达85.15%;且KHATT经再生后第4次的吸附量仍可达到第1次吸附量的90%以上。对吸附的过程和机理进行了初步探讨。Attapulgite（ATT） modified by the hydrochloric acid （HATY） was grafted by amino-silane coupling agent KH-792 （N-beta-（ aminoethyl ）-gamma-aminopropyl-trimethoxysilane ）. Thermal behavior and the structure of the grafted HArIT（KHATr） were characterized by FTIR, TGA, DSC, XRD and BET. The results showed that the KH-792 molecules were successfully grafted onto the HATT surface. The adsorption of Cr（ VI ） onto KHATF in stimulative water was also investigated. The results showed that removal rate of Cr （ VI ） in water was relatively high（85. 15% ） when the loading of KHATT is 3 g/L, pH of the water is 5.5 and the adsorption time of the KHATT is 40 min. The adsorption capacity of KHATr after four times regeneration retained at least 90% of the initial one, showing a high application value. In addition, an adsorption mechanism of KHArfT for Cr（ VI ） was proposed.

关 键 词：凹凸棒土 硅烷偶联剂 改性 吸附 再生 

分 类 号：O635.2[理学—高分子化学]