Preparation, characterization and dye adsorption properties of γ-Fe2O3/SiO2/chitosan composite
Preparation, characterization and dye adsorption properties of γ-Fe2O3/SiO2/chitosan composite
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DOI：
10.1016/j.apsusc.2011.09.045
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发表时间：
2011-12
影响因子：
6.7
通讯作者：
Hua-yue Zhu;R. Jiang;Yongqian Fu;Jinhua Jiang;Ling Xiao;G. Zeng
中科院分区：
文献类型：
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作者：
Hua-yue Zhu;R. Jiang;Yongqian Fu;Jinhua Jiang;Ling Xiao;G. Zeng
采用油包水乳化法制备了γ-Fe 2 O3/SiO2/壳聚糖复合材料，并采用X射线衍射（XRD）、扫描电镜（SEM）等手段对复合材料进行了表征。通过静态吸附实验，研究了吸附剂用量、染料初始浓度、溶液pH值和竞争阴离子等因素对复合材料吸附水中甲基橙（橙子）的影响。吸附动力学遵循准二级动力学模型，颗粒内扩散与吸附有关，但不是唯一的速率控制步骤。Freundlich等温吸附模型能很好地描述吸附平衡数据。热力学参数ΔG°、ΔH°和ΔS°的评估表明，吸附过程是自然可行的、自发的和放热的。该复合材料被证明是有效的，适用和有前途的去除水溶液中的甲基橙子，因为它具有相对较高的吸附容量比其他低成本的吸附剂。
A γ-Fe2O3/SiO2/chitosan composite was prepared by water-in-oil emulsification, and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM). Effects of various factors, including adsorbent dosage, initial dye concentration, solution pH, and competing anions, on the adsorption of methyl orange from aqueous solutions by the resulting composite were studied by batch adsorption experiments. The adsorption kinetics was found to follow the pseudo-second-order kinetic model, and intraparticle diffusion was related to the adsorption, but not as a sole rate-controlling step. The equilibrium adsorption data were well described by the Freundlich isotherm model. Evaluation of the thermodynamic parameters ΔG°, ΔH°, and ΔS° revealed that the adsorption process was naturally feasible, spontaneous, and exothermic. The composite was proven to be efficient, suitable and promising for the removal of methyl orange from aqueous solutions since it has a relatively higher adsorption capacity than other low-cost adsorbents.