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采用溶液共混法制备了壳聚糖/氧化石墨烯(CS/GO)复合材料,探讨了GO含量、pH值、CS/GO投加量、时间以及U(Ⅵ)初始浓度等对CS/GO吸附U(Ⅵ)效果的影响.试验结果表明,GO质量分数为40%,pH值为5时吸附效果最好,吸附在5 h达到平衡.准二级动力学模型和Langmuir等温吸附方程可较好地拟合其吸附过程,30℃时饱和吸附量为227.3 mg·g-1.CS/GO对U(Ⅵ)的吸附是自发的吸热反应.SEM、FTIR和XRD分析结果表明,CS/GO表面凹凸不平,羟基和氨基是U(Ⅵ)的主要结合位点.解吸试验结果表明CS/GO具有良好的重复使用性能.
The chitosan / graphene oxide (CS / GO) composites were prepared by solution blending method. The effects of the content of GO, pH, the dosage of CS / GO, the time and the initial concentration of U (Ⅵ) Adsorption on the effect of U (¢ ö) .The results showed that the adsorption was the best when the mass fraction of GO was 40% and the adsorption was at 5 h, and the adsorption equilibrium reached at 5 h.The quasi-second-order kinetic model and the Langmuir isotherm equation The adsorption of U (Ⅵ) by CS / GO was a spontaneous endothermic reaction, and the results of SEM, FTIR and XRD showed that the adsorption of CS / The surface of GO was uneven, and the hydroxyl and amino groups were the main binding sites of U (Ⅵ) .The desorption results showed that CS / GO had good reusability.