天然蛭石对结晶紫的吸附性能研究  

Study on adsorptive property of natural vermiculite to crystal violet

作　　者：巩林[1] 刘勇[2] 任小蓉[1] 庞国伟[1] 李晖[1] 

机构地区：[1]四川大学化学工程学院,四川成都610065 [2]四川大学分析测试中心,四川成都610064

出　　处：《化学研究与应用》2010年第1期115-119,共5页Chemical Research and Application

摘　　要：研究了蛭石对结晶紫的吸附特性,考察了溶液pH值、吸附剂用量、搅拌时间、结晶紫浓度、温度对吸附平衡的影响。结果表明,室温下溶液pH=6,蛭石用量为0.2000 g时蛭石对结晶紫的吸附效果最佳,吸附率超过94%。拟二级速率方程能很好地描述蛭石对结晶紫的吸附动力学,相关系数(R2)达到0.9996。不同温度下蛭石对结晶紫的吸附等温线均符合Langmuir方程,相关系数(R2)都在0.9898以上。吉布斯自由能变化△G<0,且随着温度升高,吸附量增大,表明该反应是自发进行的吸热反应。The adsorptive property of Crystal Violet （CV） on vermiculite was studied, the effect of its adsorption equilibrium was investigated under different conditions. The results showed that the best adsorption conditions are pH = 6 of solution and 0.2000 g vermiculite at room temperature,and the adsorption ratio of CV on the vermiculite is more than 94%. Pseudo second order model can best describe the reaction rate with 0. 9996 of the correlation coefficient （R^2 ）. The adsorption isotherms for CV follow Langmiur isotherm medel,which R^2 is over 0. 9898. The change of Gibbs free energy below zero, and the equilibrium adsorption capacity increases with increasing temperaure from 25 ℃ to 55 ℃,indicating that the adsorption process is spontaneous and endothermic.

关 键 词：蛭石 结晶紫 吸附 动力学 热力学 

分 类 号：O658.1[理学—分析化学]