硅酸盐通报2017，Vol.36Issue(4)：1159-1163,1168,6.
改性膨润土对刚果红的吸附动力学及热力学研究
Kinetics and Thermodynamics Study on Congo Red Adsorption by CTAB Modified Bentonite
摘要
Abstract
The modified bentonite was prepared using bentonite modified with cetyltrimethyl ammonium bromide (CTAB).The structure of this modified bentonite was characterized by fourier transform infrared spectra (FTIR) and XRD.The effects of the dosage and pH value on the adsorption of Congo red from water were studied.The thermodynamics and kinetics of Congo red adsorption on the modified bentonite was stuied also.It is shown that the CTAB could be inserted into the interlayer of bentonite with the removal rate as high as 97.15% when the dosage is 4 g/L and pH is 4.The adsorption process of Congo red on the modified bentonite followed the pseudo-second order kinetic equation and the adsorption behavior fited with the Langmuir sorption isotherm equation.The results of thermodynamic analysis are:enthalpy (ΔH)< 0,Gibbs free energy (ΔG)<0,and entropy (ΔS)<0,which suggest that the sorption is an exothermic, spontaneous and decreasing entropy process.关键词
CTAB/膨润土/刚果红/吸附/动力学/热力学Key words
CTAB/bentonite/Congo red/adsorption/kinetics/thermodynamics分类
资源环境引用本文复制引用
孙志勇,严彪,王爱民,白妮..改性膨润土对刚果红的吸附动力学及热力学研究[J].硅酸盐通报,2017,36(4):1159-1163,1168,6.基金项目
国家自然科学基金(21543016) （21543016）
陕西省科技厅项目(2016SF-451) （2016SF-451）
榆林市科技计划项目(Gy13-03) （Gy13-03）
