Cu2+、Pb2+在高岭土中的顺序竞争吸附动力学研究

本文以吸附动力学实验为基础，结合动力学模型对典型的重金属Cu2+ 、Pb2+在高岭土中的顺序竞争吸附动力学特性进行了深入的研究，重点考察了离子的初始浓度、两种重金属离子进入土壤的先后顺序及时间节点对吸附过程和结果的影响。结果表明：高岭土中存在两种类型的吸附位点；高岭土对同时竞争时两种重金属的吸附总量大于顺序竞争时的吸附总量，且进入高岭土的时间点对吸附结果也有很大的影响；此外伪一级动力学方程仅适用于反应的初始阶段，而伪二级动力学方程则可以较好的拟合整个竞争吸附过程。

Study on adsorption kinetics of Cu2+and Pb2+ in kaolinite by sequential competitive adsorption

Based on the adsorption kinetics experiments, kinetic model was used to study the sequential competitive adsorption kinetics of typical heavy metals Cu2 + and Pb2 + in kaolin. The initial concentration of ions, the two heavy metal ions entering the soil The sequence and time of nodes on the adsorption process and the results. The results show that there are two types of adsorption sites in kaolin: the total amount of two heavy metals adsorbed by kaolin at the same time is greater than that in sequential competition, and the time of entry into kaolin also has a great influence on the adsorption results. In addition, the pseudo-first-order kinetic equation is only applicable to the initial stage of the reaction, while the pseudo-second-order kinetic equation can better fit the entire competitive adsorption process.