交联壳聚糖/聚羟基铝改性蒙脱土的制备及其对水中Cu^(2+)的吸附性能研究  

Preparation of Cross-linked Chitosan/montmorillonite in the Presence of Hydroxy-aluminum Oligomeric Cations and its Adsorption to Cu^(2+) in Aqueous Solutions

作　　者：胡宁[1] 段炼[1] 张建明[1] 李静[1] 孟磊[1] 谢鲜梅[1] 

机构地区：[1]太原理工大学化学化工学院,山西太原030024

出　　处：《山西大学学报（自然科学版）》2014年第1期98-105,共8页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(21301126);山西省青年科技研究基金(2013021009-3);山西省科技发展计划工业攻关项目(20130321033-02);太原市科技项目(120238);太原理工大学2012年校青年基金(2012L018);太原理工大学2012年校青年基金(2012L062)

摘　　要：用交联壳聚糖和Al13柱化剂共同改性蒙脱土,制得交联壳聚糖/聚羟基铝改性蒙脱土。X-射线衍射数据表明,改性蒙脱土层间距明显增大,达2.09nm.研究了改性蒙脱土对水中Cu2+的吸附性能,结果表明:环氧氯丙烷交联壳聚糖单元体分子物质的量与聚羟基铝柱撑蒙脱土阳离子交换量比例为0.45∶1,25℃,吸附时间为4h,投加量为10g/L,pH 6.5条件下,改性蒙脱土对Cu2+的去除率为96%;吸附动力学过程符合准二级反应方程的描述;内部扩散方程表明膜扩散和颗粒内扩散联合控制吸附过程;吸附热力学过程符合Freundlich等温吸附模型。热力学参数ΔG<0,ΔH<0,ΔS<0.The montmorillonite was modified by cross-linked chitosan and hydroxy-aluminum oligomeric cat- ions and its structure was characterized by XRD （X-ray diffraction）. The d001 value of the montmorillonite reached 2.09 nm. For the cross-linked chitosan/Alla-pillared montmorillonite= 0. 45 = 1 ratio,when the ad- sorption time was for 4 h,and the dosage was 10 g/L,at 25 ℃（pH=6.5）,the removal rate of 100 mg/L Cue＋ solution reached 96%. The dynamic experiments suggested that the adsorption followed the pseudo second order kinetic equation. The pore diffusion equation indicated that the adsorption was controlled by the intrapaticle diffusion and the surface diffusion together. The adsorption isotherm for Cu2＋ ion corre- sponds with Freundlich equation. The value of the thermodynamic parameters,such as △G,△H and △S was also provided.

关 键 词：交联壳聚糖 聚羟基铝离子 蒙脱土 CU^2+ 吸附 

分 类 号：O647.3[理学—物理化学]