摘要
通过吸附实验,研究了经冷冻干燥-加热处理(变温处理)的凹凸棒石黏土对Cu2+的吸附动力学和热力学特性。结果表明,在298 K下,变温处理后的凹凸棒石黏土吸附Cu2+符合拟二级动力学方程。当温度在298~318 K之间时,吸附等温线更好地符合Langmuir方程,饱和吸附量为54.64~71.94 mg/g。热力学计算表明,摩尔吉布斯自由能变为-21.32^-26.82kJ/mol,摩尔焓变为60.46 kJ/mol,摩尔熵变为273.77J/(mol.K),表明变温处理后凹凸棒石黏土对Cu2+的吸附是自发吸热过程,以化学吸附为主。
Adsorption kinetics and thermodynamics of Cu2＋ on a new type of attapulgite, which was treated with procedures of freeze-drying and heating（change temperature treating） was studied. The experimental results indicated that the adsorption processes conformed to pseudo-second order equation at 298 K. In the temperature range of 298 - 318 K, the adsorption isotherms followed the Langmuir isothermal equation more exactly, and the maximum adsorption quantity was in the range of 54.64-71.94 mg/g. According to the measured thermodynamic parameters, the adsorption enthalpy, the Gibbs free energy and the entropy could be calculated, and they were 60.46 kJ/mol, -21.32--26.82 kJ/mol and 273.77 J/（mol.K）, respectively. These results indicated that the adsorption of Cu2＋ on the treated attapulgite was spontaneous and endothermic, and the adsorption was mainly dominated by chemical adsorption.
出处
《非金属矿》
CAS
CSCD
北大核心
2012年第5期58-61,共4页
Non-Metallic Mines
基金
国家自然科学基金资助项目(51174096)
淮安市工业支撑项目(HAG2010013)
关键词
凹凸棒石黏土
变温处理
铜离子
吸附
attapulgite change temperature treating Cu2＋ adsorption
