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为研究生物陶对酸性品红的吸附行为,对不同温度下(298、303、308、313、318 K)的吸附数据分别用Langmuir、Freundlich和Dubinin-Radushkevish方程进行拟合以确定其吸附模式,用准一级动力学方程和准二级动力学方程拟合了生物陶对酸性品红的吸附动力学过程,采用Web-Morris模型对吸附动力学机制进行探讨,并计算了其Gibbs自由能变(!G0)、焓变(!H0)和熵变(!S0)等热力学函数.结果表明,生物陶对酸性品红吸附能力随着温度的升高而升高;Langmuir方程更适合描述其吸附行为.Gibbs自由能变(!G0)小于0,焓变(!H0)和熵变(!S0)均大于0,说明此吸附过程为自发、吸热、且趋于无序.伪二级动力学方程可描述生物陶对酸性品红的吸附动力学过程,速率系数k2为0.089 g·mg-1·min-1.Web-Morris模型可很好地解释吸附动力学机制.
In order to study the adsorption behavior of biogold on acid fuchsine, the adsorption data of different temperature (298,303,308,313,318 K) were fitted by Langmuir, Freundlich and Dubinin-Radushkevish equations to determine the adsorption mode, The adsorption kinetics of biogas to acid fuchsin was fitted by quasi-first-order kinetic equation and quasi-second-order kinetic equation, and the adsorption kinetics was discussed by Web-Morris model. The Gibbs free energy change (! G0), enthalpy change (! H0) and entropy change (! S0) .The results showed that the adsorption capacity of biotite to acid fuchsin increased with the increase of temperature; Langmuir equation was more suitable to describe the adsorption Behavior.Gibbs free energy change (! G0) is less than 0, enthalpy change (! H0) and entropy change (! S0) are greater than 0, indicating that the adsorption process is spontaneous, endothermic and tends to disorder. The kinetic equation describes the adsorption kinetics of biogas for acid fuchsin, with a rate coefficient k2 of 0.089 g · mg-1 · min-1. The Web-Morris model can well explain the adsorption kinetics.