Effective removal of hexavalent chromium from aqueous solutions by adsorption on mesoporous carbon microspheres

吸附 吸热过程 化学 六价铬 水溶液 介孔材料 弗伦德利希方程 解吸 朗缪尔吸附模型 化学工程 核化学 有机化学 热力学 催化作用 物理 工程类
作者
Jianguo Zhou,Yuefeng Wang,Jitong Wang,Wenming Qiao,Donghui Long,Licheng Ling
出处
期刊:Journal of Colloid and Interface Science [Elsevier BV]
卷期号:462: 200-207 被引量:136
标识
DOI:10.1016/j.jcis.2015.10.001
摘要

High-surface-area mesoporous carbon microspheres were successfully synthesized by a spraying method with the purpose of removing Cr(VI) from waste water. Various factors influencing the adsorption of Cr(VI), including pH, adsorption temperature, and contact time were studied. As the adsorption process was pH dependent, it showed maximum removal efficiency of Cr(VI) at pH 3.0. Pseudo-second-order model was found to best represent the kinetics of Cr(VI) adsorption. The adsorption parameters were determined using both Langmuir and Freundlich isotherm models, and Qm value was as high as 165.3mg/g. The thermodynamic parameters including standard Gibb's free energy (ΔG(0)), standard enthalpy (ΔH(0)) and standard entropy (ΔS(0)) were investigated for predicting the nature of adsorption, which suggested the adsorption was an endothermic and a spontaneous thermodynamically process. Furthermore, Fe3O4-loaded MCMs were prepared to rapidly separate the adsorbent from the solution by a simple magnetic process. Fe3O4-loaded MCMs had a high adsorption capacity of 156.3mg/g, and a good regeneration ability with a capacity of 123.9mg/g for the fifth adsorption-desorption cycle.
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