本文合成了β-环糊精功能化的石墨烯纳米材料(3-CD-GNs),考察了其作为一种新型高效吸附剂对水中酸性大红G(ASG)和橙黄Ⅱ(OrangeⅡ)的吸附性能.该材料结合了石墨烯和β-环糊精的特性,表现出对所述两种染料良好的吸附性能,吸附平衡时间小于3 min,吸附率达90％以上,β-CD-GNs对ASG和橙黄Ⅱ的最大吸附量为622.2 mg·g-1和534.7 mg·g-1.另外,考察了β-CD-GNs用量、溶液pH、反应温度对吸附效果的影响.结果表明,当溶液pH值为6.0,β-CD-GNs浓度达到25 mg·L-1时,吸附率最大,而且吸附率随反应温度升高而降低.通过对吸附数据进行线性拟合发现,3-CD-GNs对ASG和橙黄Ⅱ的吸附等温线符合Langmuir吸附等温式.该材料在印染废水的处理领域有潜在的应用价值.
In textile industry,azo dyes and degradation products can be released into environment via wastewater during the dying process.They are toxic,mutagenic or carcinogenic,which pose a threat to human health.This paper describes the synthesis of β-cyclodextrin functionalized graphene nanosheets (β-CD-GNs) and investigation on the removal of dye pollutants.By coupling the distinctive properties of graphene and β-cyclodextrin,β-CD-GNs exhibited excellent adsorption properties for Acid Scarlet G (ASG) and Orange Ⅱ.The adsorption equilibrium time was less than 3 rmin and the adsorption rate was more than 90％.Moreover,β-CD-GNs show high adsorption ability for both ASG and Orange Ⅱ.The adsorption capacities for ASG and Orange Ⅱ were 622.2 and 534.7 mg·g-1,respectively.The effect of pH and temperature were also investigated.The results indicated that the optimal amount ofβ-CD-GNs was 25 mg·L-1 and the optimal pH was 6.0.The adsorption behaviors of ASG and Orange Ⅱ on β-CD-GNs conformed to the Langrnuir isotherms model.
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