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以正硅酸乙酯(TEOS)为无机前驱体,季铵化聚乙烯醇(QPVA)为有机基质,采用溶胶-凝胶法制备QPVA/TEOS有机/无机杂化膜,并将其作为吸附材料用于脱除水溶液中的Cr(Ⅵ)离子。结果表明,具有较好吸附效果的膜为TEOS质量分数为15%的有机/无机杂化膜。在Cr(Ⅵ)离子初始浓度为90mg/L的条件下,复合膜的最优吸附工作条件为吸附时间为100min,pH=3。此时计算得到的最佳吸附容量为20mg/g。动力学研究表明,实验数据符合拟二级吸附动力学模型,等温吸附遵循Freundlich曲线。热力学数据表明,该吸附反应为吸热的自发过程。
QPVA / TEOS organic / inorganic hybrid films were prepared by sol-gel method using tetraethylorthosilicate (TEOS) as inorganic precursor and quaternized polyvinyl alcohol (QPVA) as organic matrix. For removal of Cr (VI) ions in aqueous solution. The results show that the membrane with good adsorption effect is an organic / inorganic hybrid membrane with TEOS mass fraction of 15%. Under the initial Cr (Ⅵ) concentration of 90mg / L, the optimum adsorption conditions for the composite membrane were adsorption time 100min, pH = 3. The optimal adsorption capacity calculated at this time was 20 mg / g. Kinetic studies show that the experimental data are in accordance with the quasi-second-order adsorption kinetics model and isotherm adsorption follows the Freundlich curve. Thermodynamic data show that the adsorption reaction is spontaneous endothermic process.