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摘要:
用KH560在碱性条件下修饰β-CD制得β-CD聚合物（KACD)，再将聚合物负载到蛭石上，制备β-CD改性蛭石复合材料(KACDS)。SEM和FTIR表征结果表明β-环糊精成功负载在蛭石表面，且KACDS的比表面积比原蛭石的大。以KACDS对亚甲基蓝吸附性能为指标，通过单因素法确定β-环糊精改性蛭石的较佳制备工艺为：酸化蛭石与KACD的质量比为1∶4，改性温度为65 ℃，改性时间为12 h。探究KACDS吸附亚甲基蓝(MB）和龙胆紫（GV）实验结果表明，复合材料吸附性能受体系pH值的影响最显著，在pH值为9时，KACDS对MB的吸附率较高为99%，在pH=7时，复合材料对初始浓度为8 mg/L的GV溶液吸附48 min时的吸附吸除率较高为93.19%，且复合材料对MB、GV的吸附性能优于原蛭石。分析吸附动力学实验拟合的模型可知，交联材料对GV的吸附过程与二级动力学模型较为吻合，归属化学吸附过程，且受到温度影响较小。
Abstract:β-Cd polymer (KACD) was prepared by modifying β-Cd with KH560 at alkaline conditions, and then the polymer was loaded onto vermiculite to prepare β-Cd modified vermiculite composite (KACDS). Based on the adsorption capacity of methylene blue by KACDS, the optimum preparation process of β-cyclodextrin modified vermiculite was determined by single factor method: the mass ratio of acidified vermiculite to KACD was 1∶4, the modification temperature was 65 ℃, and the modification time was 12 h. Test results of adsorption of methylene blue (MB) and Gentian violet (GV) by KACDS showed that the adsorption performance of the composite is most significantly affected by the pH value of the system. When the pH value is 9, the adsorption rate of KACDS on MB is the highest 99%, and when the pH value is 7, the adsorption rate of the composite on the GV solution with the initial concentration of 8 mg/L for 48 min is the highest 93.19%. The adsorption properties of MB and GV are better than those of vermiculite. By analyzing the model fitted by the adsorption kinetics experiment, it can be seen that the adsorption process of GV by the cross-linked material is consistent with the second-order kinetic model, which belongs to the chemical adsorption process and is less affected by temperature.
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表 1 不同温度下KACDS吸附龙胆紫动力学参数对比
Table 1. Comparison of kinetic parameters of Gentian violet adsorption by KACDS at different temperatures
T/K qe0/
(mg/g)一阶动力学参数 二阶动力学参数 K1 qe R2 K2 qe R2 288 0.950 2 0.093 6 0.085 4 0.887 0 2.418 2 0.957 4 0.999 96 298 0.917 0 0.092 9 0.156 6 0.799 0 1.125 7 0.932 3 0.999 71 308 0.950 6 0.102 4 0.099 4 0.846 6 2.246 7 0.958 7 0.999 95 
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