液/固离子吸附体系中的强度因子  

Intensity Factor in Liquid/Solid Ion Adsorption Systems

作　　者：赵芳[1] 吴晓芙[1] 黄中子[1] 雷电[1] 芦鹏[1] 于旭彪[1] 张艳丽[1] 赵崇[1] 周海兰[1] 

机构地区：[1]中南林业科技大学,湖南长沙410004

出　　处：《中南林业科技大学学报》2007年第1期109-117,共9页Journal of Central South University of Forestry & Technology

基　　金：948项目[2005-02]"水环境保护中的湿地技术";湖南省教育厅产业化推广项目[湘教发2003-101]

摘　　要：在离子质量浓度25～500mg·L^-1和吸附剂（蛭石）质量浓度10～150g·L^-1范围内分析测试了平衡固液体系中Zn、Cd离子等温吸附量．试验数据表明：平衡离子吸附密度qe（离子吸附量与吸附剂量的比值）唯一由C0/W0（起始点液相离子浓度C0与吸附剂浓度W0的比值）与Ce/W0（平衡液相离子浓度Ce与W0的比值）的差异来决定，与离子、吸附剂的浓度及吸附反应过程无关．重复测试证实：给定C0/W0时，qe与C0/W0具有唯一对应的值．指出液／固相离子吸附体系中的强度因子不是离子的浓度而是离子量与吸附剂量的比值．离子吸附反应的方向与速率取决于系统中离子量与吸附剂量的相对水平，离子吸附反应达到平衡的条件是离子与吸附剂化学势之和在液、固相之间的差异为0．Experiments of Zn^2＋ and Cd^2＋ adsorption on vermiculite in aqueous solutions were carried out in ion concentration range 25 500 mg/L and adsorbent concentration range 10～150 g/L at a constant temperature of 25 ℃. Results obtained from the tests indicate that the equilibrium adsorption density qe（the ratio of adsorption quantity to adsorbent quantity） was uniquely determined by the difference between C0/W0（the ratio of initial ion concentration C0 to adsorbent concentration W0） and Ce/W0（the ratio of the equilibrium ion concentration in liquid phase Ceto W0）, independent of ion and adsorbent concentration and process history. Repeated tests have confirmed that given C0/W0, qe corresponded to a unique C0/W0. The argument presented here is that the intensity factor in a liquid/solid ion adsorption system is not the volume-based ion concentration but rather the ratio of ion quantity to adsorbent quantity as it is the relative level of ion quantity to adsorbent quantity that determines both the direction and rate of the ion adsorption. Ion adsorption arrives at equilibrium only when the difference in sum of ion and adsorbent chemical potentials between liquid and solid phases is zero.

关 键 词：环境工程 离子吸附 液/固体系 强度因子 ZN^2+ CD^2+ 蛭石 

分 类 号：X131[环境科学与工程—环境科学]