二硫化钼
吸附
朗缪尔吸附模型
石墨烯
吸热过程
水溶液
钼
X射线光电子能谱
朗缪尔
动力学
疏水效应
材料科学
化学
化学工程
无机化学
纳米技术
物理化学
有机化学
物理
工程类
量子力学
作者
Yanhong Chao,Wenshuai Zhu,Xiangyang Wu,Fangfang Hou,Suhang Xun,Peiwen Wu,Haiyan Ji,Hui Xu,Huaming Li
标识
DOI:10.1016/j.cej.2013.12.048
摘要
Graphene-like layered molybdenum disulfide (g-MoS2) was prepared by hydrothermal synthesis method, which was characterized by atomic force microscopy (AFM), X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS). The performance of using g-MoS2 as an adsorbent for removal of doxycycline (DC) antibiotic from aqueous solution was investigated. The adsorption kinetics, isotherms, thermodynamics and effects of solution pH, ions strength on the adsorption were evaluated in batch adsorption experiments. Compared with the purchased commercial MoS2, g-MoS2 showed higher adsorption capacity around 310 mg g−1 in the range of pH 4–9. Although both pseudo-first and second order equation described the adsorption kinetics rationally, pseudo-second-order model showed better fit with high R2. Langmuir model provided the best fit to the equilibrium data and the Langmuir maximum adsorption capacity was found to be 556 mg g−1 at pH 6. The adsorption was a spontaneous and endothermic process deduced by the thermodynamic analysis. With Na+ in the solution could promote the adsorption. The adsorption mechanism was probably π–π interaction, hydrophobic effect and electrostatic interaction. All these results indicated that the prepared g-MoS2 was a potential adsorbent for the removal of DC antibiotic from aqueous solution.
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