Kinetic models of sorption: a theoretical analysis
Kinetic models of sorption: a theoretical analysis
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DOI：
10.1016/j.jcis.2004.03.048
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发表时间：
2004-08-01
影响因子：
9.9
通讯作者：
Azizian, S
中科院分区：
文献类型：
--
作者：
Azizian, S
从理论上探讨了吸附剂从溶液中吸附的动力学。得到了两种情况下的一般解析解。它已被证明，在高初始浓度的溶质（山梨酸盐）的一般方程转换为伪一阶模型，并在较低的初始浓度的溶质，它转换为伪二阶模型。在较高的溶质初始浓度下，吸附过程符合准一级动力学模型，而在较低的溶质初始浓度下，吸附过程符合准二级动力学模型。理论结果（推导方程）表明，伪一级和伪二级模型的速率常数是吸附和解吸速率常数以及溶质初始浓度的组合。得到的理论方程用于相关的实验数据的吸附动力学的一些溶质在各种吸附剂。理论预测与实验数据非常吻合。(C)2004年爱思唯尔公司All rights reserved.
The kinetics of sorption from a solution onto an adsorbent has been explored theoretically. The general analytical solution was obtained for two cases. It has been shown that at high initial concentration of solute (sorbate) the general equation converts to a pseudo-first-order model and at lower initial concentration of solute it converts to a pseudo-second-order model. In other words, the sorption process obeys pseudo-first-order kinetics at high initial concentration of solute, while it obeys pseudo-second-order kinetics model at lower initial concentration of solute. The theoretical results (derived equations) show that the observed rate constants of pseudo-first-order and pseudo-second-order models are combinations of adsorption and desorption rate constants and also initial concentration of solute. The obtained theoretical equations are used to correlate experimental data for sorption kinetics of some solutes on various sorbents. The predictions of the theory are in excellent agreement with the experimental data. (C) 2004 Elsevier Inc. All rights reserved.