Hong Song, Wen Cheng, He Jing, Gan Fuxing, Ho Yuh-Shan
School of Resource and Environmental Science, Wuhan University, Wuhan, People's Republic of China.
J Hazard Mater. 2009 Aug 15;167(1-3):630-3. doi: 10.1016/j.jhazmat.2009.01.014. Epub 2009 Jan 16.
The effect of temperature on the equilibrium adsorption of Methylene Blue dye from aqueous solution using bentonite was investigated. The equilibrium adsorption data were analyzed using three widely applied isotherms: Langmuir, Freundlich, and Redlich-Peterson. A non-linear method was used for comparing the best fit of the isotherms. Best fit was found to be Redlich-Peterson isotherm. Thermodynamic parameters, such as DeltaG degrees, DeltaH degrees, and DeltaS degrees were calculated using adsorption equilibrium constant obtained from the Langmuir isotherm. Results suggested that the Methylene Blue adsorption on bentonite was a spontaneous and endothermic process.
研究了温度对使用膨润土从水溶液中平衡吸附亚甲基蓝染料的影响。使用三种广泛应用的等温线对平衡吸附数据进行了分析：朗缪尔等温线、弗伦德利希等温线和雷德利希-彼得森等温线。采用非线性方法比较等温线的最佳拟合情况。发现雷德利希-彼得森等温线拟合效果最佳。利用从朗缪尔等温线获得的吸附平衡常数计算了诸如吉布斯自由能变（ΔG°）、焓变（ΔH°）和熵变（ΔS°）等热力学参数。结果表明，膨润土对亚甲基蓝的吸附是一个自发的吸热过程。
