还原态氧化石墨烯对Zn(Ⅱ)的吸附动力学与热力学

doi:10.3724/SP.J.1095.2014.40065

摘要/Abstract

摘要： 以乙二胺(EDA)还原氧化石墨烯(GO)制得一种吸附材料，即还原态氧化石墨烯(RGO)。采用批量平衡法研究了RGO对Zn(Ⅱ)的吸附动力学与热力学，利用Lagergren准一级及准二级动力学方程、Langmuir和Freundlich等温方程对实验数据进行了拟合分析。研究结果表明，Lagergren准二级吸附动力学模型能够较好地描述实验结果，表明该吸附过程以化学吸附为主。 RGO的吸附在所研究的Zn(Ⅱ)浓度范围内更符合Langmuir等温吸附经验式，ΔH0=-21.60 kJ/mol，吸附焓变小于零，表明该吸附为放热过程；吸附吉布斯自由能变化ΔG0为正值，表明该吸附是一个非自发的过程。

关键词: Zn(II), 氧化石墨烯, 吸附, 动力学, 热力学

Abstract: Reduced graphene oxide(RGO) was prepared by reducing graphene oxide(GO) with ethylenediamine(EDA). The adsorption kinetics and thermodynamics of Zn(Ⅱ) onto RGO were investigated with a batch method. The Lagergren pseudo-first-order and pseudo-second-order kinetic model, Langmuir and Freundlich isotherm models were applied to simulate the experimental data. The results show that the experimental data are well described with the Lagergren pseudo-second-order model, indicating that the adsorption process is chemisorption mainly. The adsorption isothermal process fits well with the Langmuir model. The enthalpy change is -21.60 kJ/mol and the Gibbs free energy is positive, which indicates that the adsorption of Zn(Ⅱ) is exothermic and non-spontaneous, respectively.

Key words: Zn(II), graphene oxide, adsorption, kinetics, thermodynamics

中图分类号:

O647.3

黄福, 张帆, 王波, 孙华菊. 还原态氧化石墨烯对Zn(Ⅱ)的吸附动力学与热力学[J]. 应用化学, DOI: 10.3724/SP.J.1095.2014.40065.

HUANG Fu, ZHANG Fan*, WANG Bo, SUN Huaju. Kinetics and Thermodynamics of Adsorption of Zn(Ⅱ) on Reduced Graphene Oxide[J]. Chinese Journal of Applied Chemistry, DOI: 10.3724/SP.J.1095.2014.40065.

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