水洗和酸洗蛭石样本的离子吸附性能比较分析-中南林业科技大学学报.PDFVIP

第32 卷 第12 期 中 南 林 业 科 技 大 学 学 报 Vol. 32 No. 12 2012 年 12 月 Journal of Central South University of Forestry Technology Dec. 2012 水洗和酸洗蛭石样本的离子吸附性能比较分析 彭 婧，吴晓芙，李 芸，姚咏歌，刘毅霖 ( 中南林业科技大学环境科学与工程研究中心, 湖南长沙4 10004 ） 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。 关键词：蛭石；水洗；酸洗；Pb2+ ；Cd2+ ；Zn2+ ；人工湿地；填料 中图分类号：S719 文献标志码：A 文章编号：1673-923X(2012) 12-0078-05 Ion adsorption characteristics of water-rinsed and acid-rinsed vermiculite samples PENG Jing, WU Xiao-fu, LI Yun, YAO Yong-ge, LIU Yi-lin (Institute of Environmental Science and Engineering, Central South University of Forestry Technology, Changsha 410004, Hunan, China) Abstract: The experiments were conducted to compare the differences in adsorption of Pb2+, Cd2+ and Zn2+ ions from aqueous solution onto water-rinsed and acid-rinsed swelling vermiculite samples in aqueous solutions. The results show that the ion adsorption of water- rinsed 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 amoun