(1.中南工业大学化学系，长沙410083；
2.长沙大学化学系一长沙410004)
摘 要: 研究了用高岭上制备A型沸石及有关工艺过程，得出了最佳工艺条件，并对产品进行了X射线衍射及电镜扫描的测定。制备出对钙离子吸附能力高的A型沸石，研究了其对济液中Ca2+离子的吸附机理，讨论了温度和溶液浓度变化对A型沸石吸附Ca2+离子动力学的影响。实验结果表明：A型沸石对Ca2+的吸附可分为两个阶段:在反应的初期(t≤10min)，反应进行非常之快，影响因素复杂，动力学方程呈曲线关系；在反应的后期(t > 10 min)满足方程dC/dt= -k·G。经过计算，得出该吸附反应的活化能E=17. 07 kJ/mol，吸附频率因子A=202.4 s-1。
关键字: A型沸石 制备 钙离子 吸附机理
ADSORPTION MECHANISM TO CALCIUM ION
（1.Department of Chemistry, Central South University of Technology, Changsha 410083
2．Department of Chemistry, Changsha University, Changsha 410004）
Abstract:The process of using kaolinite from Leiyang county, Hunan Province to prepare zeolite A was reported.The best technical condition for preparing zeolite A has been obtained. The X-ray diffraction analysis and scanning electron microscope observation of the product were carried out. The kinetics of zeolite A adsorbing Ca2+in aqueous solution was described,and the influences of temperature and the original concentration of Ca2+were emphatically studied. The results showed that there are two stages in this adsorption reaction. In the first stage (t≤10 min), the reaction is very quick and the kinetics relation is complex; in the second stage (t>10 min), the reaction becomes slow, which accords with the equation of lnC=-kt+b. The relationship between the adsorption velocity constant and the temperature in the later stage accords with the Arrhenius equation; the activation energyE=17.07 kJ/mol, and the adsorption frequency factor A=202.4 s-1.
Key words: zeolite A preparation calcium ion adsorption mechanism
