使用壳聚糖二维蒙脱石多孔水凝胶从水中去除 Pb(II)。
Pb(ΙΙ) removal from water using porous hydrogel of chitosan-2D montmorillonite.
机构信息
School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China.
School of Resources and Environmental Engineering, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China; Hubei Key Laboratory of Mineral Resources Processing and Environment, Wuhan University of Technology, Luoshi Road 122, Wuhan, Hubei 430070, China.
出版信息
Int J Biol Macromol. 2019 May 1;128:85-93. doi: 10.1016/j.ijbiomac.2019.01.098. Epub 2019 Jan 23.
An eco-friendly chitosan-2D montmorillonite (CTS/2DMMT) hydrogel with the characteristics of high surface area, porous structure and easy separation as a new type of adsorbent was investigated. Hydrogel was prepared via self-assembling 2DMMT and CTS. 2DMMT and hydrogel were characterized by particle size analysis, SEM and AFM, respectively. The results showed the 2DMMT was well exfoliated and the porosity of hydrogel's structure could be adjusted by the CTS/2DMMT ratio. The effect of pH, adsorption kinetics and adsorption isotherm of Pb(ΙΙ) from aqueous solution onto hydrogels were investigated. Adsorption could proceed without the pH adjustment and hydrogel with a looser structure has better adsorption effectiveness. The Pseudo-first-order kinetics model and Freundlich isotherm model could fit well with the Pb(ΙΙ) adsorption process onto hydrogel. The adsorption mechanism was the ion-exchange according to the analysis of XPS and EDS.
一种环保的壳聚糖二维蒙脱石（CTS/2DMMT）水凝胶，具有高比表面积、多孔结构和易于分离的特点，被用作新型吸附剂。水凝胶是通过 2DMMT 和 CTS 的自组装制备的。通过粒度分析、SEM 和 AFM 分别对 2DMMT 和水凝胶进行了表征。结果表明，2DMMT 得到了很好的剥离，并且水凝胶结构的孔隙率可以通过 CTS/2DMMT 比例进行调节。考察了 pH 值、吸附动力学和水溶液中 Pb(Ⅱ)在水凝胶上的吸附等温线。吸附过程无需调节 pH 值，结构较疏松的水凝胶具有更好的吸附效果。准一级动力学模型和 Freundlich 等温线模型可以很好地拟合 Pb(Ⅱ)在水凝胶上的吸附过程。根据 XPS 和 EDS 的分析，吸附机制是离子交换。
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