两种有机物改性膨润土对Cu^(2+)和Zn^(2+)的吸附-解吸研究  

ADSORPTION AND DESORPTION OF Cu(Ⅱ) AND Zn(Ⅱ) ON NA-BENTONITE MODIFIED BY HEXADECYL TRIMETHYL AMMONIUM BROMIDE AND DEGRADATION PRODUCTS OF PIG DEJECTA

作　　者：成杰民[1] 赵丛[1] 解敏丽[2] 

机构地区：[1]山东师范大学人口资源与环境学院,济南250014 [2]山东省环境监测中心站,济南250013

出　　处：《离子交换与吸附》2012年第2期126-134,共9页Ion Exchange and Adsorption

基　　金：国家重大科技支撑计划(2008BAB38B05)

摘　　要：选用天然有机物料(猪粪降解液)和有机化学试剂[十六烷基三甲基溴化胺(HDTMA)]对钠基膨润土进行表面改性,比较了膨润土对两类有机物的吸附特性,以及两种有机物改性膨润土对Cu2+、Zn2+吸附-解吸性能的差异。结果表明,膨润土对HDTMA和猪粪降解液是优惠吸附,且前者最大吸附量为382.4mg/g,是后者的4.19倍。HDTMA改性膨润土对Cu2+、Zn2+的最大吸附量均大于猪粪降解液改性膨润土,前者分别为后者的1.12倍(Cu2+)和1.09倍(Zn2+),且两种吸附剂对Cu2+的最大吸附量和吸附速率均大于Zn2+。Zn2+在两种改性膨润土上的解吸率均高于Cu2+,且Cu2+、Zn2+在猪粪改性膨润土上的解吸率均要高于在HDTMA改性膨润土的。两种有机物改性的钠基膨润土对重金属离子具有良好的吸附性能,可以用于含重金属废水的处理和重金属污染土壤的钝化修复,而猪粪降解液改性膨润土是环境友好的重金属钝化剂。The Na-bentonite modified with hexadecyl trimethyl ammonium bromide （I-IDTMA） and degradation products of pig dejecta were used as sorbents for Cu2＋ and Zn2＋. The difference of adsorption-desorption of Cu2＋ and Zn2＋ on Na-bentonite modified by two organics were investigated by the experiments of adsorption kinetics, adsorption isotherms and desorption isotherms. Batch experiments showed that HDTMA and degradation products of pig dejecta were preferentially adsorbed on Na-bentonite. The maximum adsorption capacity of HDTMA on Na-bentonite was 382.4mg/g and 4.19 times than that of degradation products of pig dejecta. The maximum adsorption capacities of Cu2＋ and Zn2＋ on Na-bentonite modified by HDTMA were higher than them by degradation products of pig dejecta, and the desorption quantity was lower. The maximum adsorption capacities of Cu2＋ on Na-bentonite modified by two organics were higher than them of Zn2＋, and adsorption quantity was lower. It could be concluded that the two sorbents had very good adsorption properties for the metal ions, and could be applied in the purification of wastewater containing such metal ions and the passivation of heavy metals in contaminated soil; however the Na-bentonite modified by degradation products of pig dejecta was an economic, environment-friendly heavy metal adsorbent.

关 键 词：膨润土 猪粪降解液 十六烷基三甲基溴化胺 表面改性 CU2+ Zn2+ 吸附-解吸 

分 类 号：X53[环境科学与工程—环境工程] O647.3[理学—物理化学]