Peng Hao, Guo Jing, Wang Bingqing
College of Chemistry and Chemical Engineering, Yangtze Normal University, Chongqing 408100, China E-mail:
Changshou Economic and Technological Development Area Development Investment Group Co., Ltd, Chongqing 408100, China.
Water Sci Technol. 2020 Nov;82(9):1848-1857. doi: 10.2166/wst.2020.455.
This paper focused on the adsorption behavior of Fe (III) in aqueous solution on melamine. The effects of experimental conditions including dosage of melamine, reaction time and reaction temperature were investigated. The results showed that nearly 99% Fe (III) was adsorbed under the optimal conditions: melamine dosage (mole ratio) at n(CHN)/n(Fe) = 3.5:1, reaction time of 60 min and reaction temperature of 90 °C. The optimal processing factors were obtained from response surface methodology and the effects of processing parameters on the removal efficiency of Fe (III) followed the order: mole ratio (n(CNH):n(Fe)) > reaction temperature > reaction time. The adsorption kinetics behavior was fitted well with the pseudo-second-order model. The thermodynamic study showed that the adsorption process was unspontaneous and endothermic. The value of free energy change and standard enthalpy change disclosed that the mechanism of adsorption onto melamine was physisorption. The results will be useful for further applications of system design in the treatment of practical waste effluents.
本文聚焦于水溶液中Fe(III)在三聚氰胺上的吸附行为。研究了三聚氰胺用量、反应时间和反应温度等实验条件的影响。结果表明，在最佳条件下：三聚氰胺用量（摩尔比）为n(CHN)/n(Fe)=3.5:1、反应时间为60分钟、反应温度为90℃时，近99%的Fe(III)被吸附。通过响应面法获得了最佳工艺因素，工艺参数对Fe(III)去除效率的影响顺序为：摩尔比（n(CNH):n(Fe)）>反应温度>反应时间。吸附动力学行为与准二级模型拟合良好。热力学研究表明，吸附过程是非自发的且吸热的。自由能变化值和标准焓变表明，三聚氰胺吸附的机制是物理吸附。研究结果将有助于系统设计在实际废水处理中的进一步应用。
