水洗和酸洗蛭石样本的离子吸附性能比较分析  

Ion adsorption characteristics of water-rinsed and acid-rinsed vermiculite samples

作　　者：彭婧[1] 吴晓芙[1] 李芸[1] 姚咏歌[1] 刘毅霖[1] 

机构地区：[1]中南林业科技大学环境科学与工程研究中心,湖南长沙410004

出　　处：《中南林业科技大学学报》2012年第12期78-82,共5页Journal of Central South University of Forestry & Technology

基　　金：国家林业科技推广项目[2010-43];国家十二五科技支撑项目(2012BAC09B03-4);湖南省环境科学与工程重点学科与重点实验室基金

摘　　要：分析比较了水洗蛭石和酸洗蛭石样本吸附Pb2+、Cd2+、Zn2+的差异。试验结果表明,水洗和酸洗样本中测试离子的吸附存在明显的离子浓度和吸附剂浓度效应。水洗样本测试离子的吸附量显著高于酸洗样本的吸附量,其原因是酸洗样本体系存在大量的H+离子参与吸附竞争,降低了吸附剂的离子吸附容量。在水洗和酸洗蛭石体系中,测试离子被吸附的毫克量差异显著,顺序为Pb2+>Cd2+≥Zn2+。水洗蛭石体系中所有测试离子的去除率都很高,说明水洗蛭石样本可作为构建人工湿地吸附缓冲系统的基质填料。The experiments were conducted to compare the differences in adsorption of Pb^2＋, Cd^2＋ and Zn^2＋ ions from aqueous solution onto water-rinsed and acid-rinsed swelling vermiculite samples in aqueous solutions. The results show that the ion adsorption of waterrinsed sample was significantly higher than that of acid-rinsed sample, the reason was that there were a large amount of H^＋ ions in the acid-rinsed sample system, which participated in the adsorptive competition, so the adsorption capacity of the acid-rinsed sample was lowered; in the water-rinsed and acid-rinsed swelling vermiculite system, among the tested ionic samples there were marked differences of milligram amount, the descending order was： Pb^2＋〉Cd^2＋≥Zn^2＋. The removals rates of all tested metal ions by water-rinsed samples were very high, thus indicating that the water-rinsed swelling vermiculite samples can be used as a buffer filler in a wetland system.

关 键 词：蛭石 水洗 酸洗 PB^2+ CD^2+ ZN^2+ 人工湿地 填料 

分 类 号：S719[农业科学—林学]