(1.中南工業(yè)大學(xué)化學(xué)系，長(zhǎng)沙410083；
2.長(zhǎng)沙大學(xué)化學(xué)系一長(zhǎng)沙410004)
摘 要: 研究了用高嶺上制備A型沸石及有關(guān)工藝過(guò)程，得出了最佳工藝條件，并對(duì)產(chǎn)品進(jìn)行了X射線衍射及電鏡掃描的測(cè)定。制備出對(duì)鈣離子吸附能力高的A型沸石，研究了其對(duì)濟(jì)液中Ca2+離子的吸附機(jī)理，討論了溫度和溶液濃度變化對(duì)A型沸石吸附Ca2+離子動(dòng)力學(xué)的影響。實(shí)驗(yàn)結(jié)果表明：A型沸石對(duì)Ca2+的吸附可分為兩個(gè)階段:在反應(yīng)的初期(t≤10min)，反應(yīng)進(jìn)行非常之快，影響因素復(fù)雜，動(dòng)力學(xué)方程呈曲線關(guān)系；在反應(yīng)的后期(t > 10 min)滿足方程dC/dt= -k·G。經(jīng)過(guò)計(jì)算，得出該吸附反應(yīng)的活化能E=17. 07 kJ/mol，吸附頻率因子A=202.4 s-1。
關(guān)鍵字: A型沸石 制備 鈣離子 吸附機(jī)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
