吸附剂浓度效应下高岭土对Cu^(2+)的吸附特性

Adsorption Characteristic of Cu^(2+) on Kaolinite Under Adsorbent Concentration Effect

选取重金属Cu^(2+)为吸附质,土壤中典型的黏土矿物高岭土为吸附剂,研究了吸附剂浓度效应对重金属Cu^(2+)在高岭土上吸附特性的影响,通过平衡吸附试验对几种经典等温吸附模型以及吸附剂浓度效应模型进行了验证.试验结果表明,吸附等温线以及平衡吸附量qe随着吸附剂浓度CS的增大而降低;在三种经典的等温吸附模型中,Freundlich模型最适于描述重金属Cu^(2+)在高岭土上的吸附规律,但仍无法解释吸附剂浓度效应;高岭土吸附Cu^(2+)以物理吸附为主,反应极易进行且几乎不具有可逆性;在三种吸附剂浓度效应模型中,幂函数模型的拟合效果较为理想.

This paper selected the heavy metal Cu2＋ and the the adsorption characteristics of Cu2＋ on kaolinite under typical clay minerals Kaolinite as absorption, and studied the influence of adsorbent concentration effect. Some isothermal adsorption experiments were conducted, and the data is used to verify the applicabilities of several classical adsorption isotherms and several kinds of sorbent effect models. The study results indicated the adsorption isotherm and the balance of adsorption density qe decreased when the sorbent concentration Cs increased. Among the three kinds of typical adsorption isotherms, Freundlich equation was the most suitable model for describing the adsorption of Cu2＋ on kaolinite, but it wasn＇ t able to describe the adsorbent concentration effect. Kaolinite adsorption was the mainly physical adsorption, and it was very easy to carry on. Among the three adsorbent concentration effect models, the fitting effect of the power function model was ideal.