有机改性凹凸棒石吸附活性艳蓝KN-R的动力学研究

摘要

By static adsorption experiments, the adsorption dynamics of organic modified attapulgite on reactive brilliant blue KN-R was studied. The results indicate that the adsorption of KN-R by organic modified attapulgite follows the pseudo-second order kinetic model. The amount of KN-R adsorbed at equilibrium(q2) increases with the increasing of initial mass concentration for KN-R, agitation speed and temperature. The results also show that KN-R is mainly adsorbed on the external surface of organic modified attapulgite, the adsorption activation energy is 39. 2 kJ/ mol. It means that the adsorption is a process combinated by physical and chemical adsorption, and the adsorption rate is controlled by not only chemical adsorption but also physical adsorption.%通过静态吸附实验方法,研究了有机改性凹凸棒石吸附活性艳蓝KN-R的动力学行为.研究结果表明:准二级动力学模型能很好地描述活性艳蓝KN-R在有机改性凹凸棒石上的动力学行为,平衡吸附量q2随着KN-R初始浓度、振荡速度、温度的增加而增加.有机改性凹凸棒石吸附活性艳蓝KN-R主要是外表面吸附,吸附活化能为39.2 kJ/mol,说明其为物理吸附、化学吸附综合作用的过程,其速率由化学过程与外扩散共同控制.