摘要
采用动态吸附法研究三聚磷酸二氢铝吸附锌离子的动力学行为并进行吸附机理的探索。结果表明:当消除内外扩散影响时,三聚磷酸二氢铝对锌离子的吸附符合二级反应动力学方程,吸附速率常数k与温度T之间的关系符合阿累尼乌斯方程式,吸附的活化能Ea=31.01 kJ.mol-1,吸附的频率因子A=147.68 L.mg-1.min-1,ln(k/T)与1/T之间的关系符合Eyring公式,其活化焓ΔH=28.46 kJ.mol-1,活化熵ΔS=-211.90 J.mol-1.K-1,其吸附机理是三聚磷酸二氢铝中的质子氢与其表面吸附的锌离子发生离子交换。
Dynamics of adsorption for zinc ion using aluminum dihydrogen tripolyphosphate is studied by dynamic absorption method.The adsorption mechanism of this process is discussed.The results show that the absorption of zinc ion on aluminum dihydrogen tripolyphosphate is a second order reaction kinetics equation when the internal or external diffusion is eliminated.The relationship between reaction rate constant k and temperature T accords with Arrhenius Equation,and the activation energy of absorption Ea is 31.01 kJ·mol-1 and frequency factor A is 147.68 L·mg-1·min-1.The relationship between ln（k/T） and 1/T accords with Eyring Equation,and the activation enthalpy of absorption ΔH is 28.46 kJ·mol-1 and the activation entropy of absorption ΔS is-211.90 J·mol-1·K-1.The main forms of aluminum dihydrogen tripolyphosphate for Zn2＋ adsorption are both surface adsorption and ion exchange with proton hydrogen.
出处
《桂林工学院学报》
北大核心
2009年第3期338-342,共5页
Journal of Guilin University of Technology
基金
国家自然科学基金资助项目(20566003)
广西民族大学博士启动基金资助项目
关键词
三聚磷酸二氢铝
锌离子
吸附
动力学
aluminum dihydrogen tripolyphosphate
zinc ion
absorption
kinetics
