有机改性凹凸棒土的制备表征及其对4-氯苯酚的吸附  

Preparation and characterization of modified attapulgite and its adsorption to 4-chlorophenol

作　　者：宋燕[1] 王海玲[1] 朱兆连[1] 孙进[1] 

机构地区：[1]南京工业大学环境学院,江苏省工业节水减排重点实验室,南京210009

出　　处：《环境工程学报》2012年第12期4481-4486,共6页Chinese Journal of Environmental Engineering

基　　金：江苏省高校自然科学研究项目(09KJB610002,10KJB610004);南京工业大学青年教师学术基金资助项目

摘　　要：利用十六烷基三甲基溴化铵(HDTMA)对凹凸棒土进行有机改性,并通过SEM、XRD、FT-IR、表面积及孔径分析对改性前后的凹凸棒土进行结构表征,结果表明,利用HDTMA对凹凸棒土改性仅是表面的负载修饰,并未改变凹凸棒土的内部结构;改性凹土对4-氯苯酚的吸附实验表明,吸附速率很快,30 min即达到吸附平衡,吸附符合准二级动力学方程,吸附等温线符合H型吸附等温方程,在pH为中性的环境下有利于吸附。The attapulgite was modified by hexadecyl trimethylammonium bromide （HDTMA）. The modified attapulgite was characterized by SEM, XRD,FT-IR, specific surface area and pore size distribution. The results showed that HDTMA was loaded on the surface of attpulgite and didn＇t change its crystal structure. The adsorption results indicated that adsorption equilibrium of 4-chlorophenols onto the modified attapulgite was achieved within 30 minutes. The adsorption fitted well with the pseudo-second-order kinetic model. The fitted isotherm equation of the adsorption accorded with the Henry absorption model and it is better for adsorption under pH = 6.7.

关 键 词：改性凹凸棒土 十六烷基三甲基溴化铵 4-氯苯酚 吸附等温线 吸附动力学 

分 类 号：X786[环境科学与工程—环境工程]