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以戊二醛为交联剂、用硫脲进行接枝改性合成了交联壳聚糖树脂,研究其对Au(Ⅲ)的吸附特性,考察了pH值、吸附温度、吸附时间等因素对吸附过程的影响。结果表明:溶液pH值对吸附影响较大,最佳pH值在5.0左右;在实验浓度和温度范围内,树脂对Au(Ⅲ)的等温吸附数据与Freundlich模型拟合较好;吸附过程宏观表现为吸热过程;吸附动力学符合准二级动力学方程,表观活化能为41.12kJ/mol,吸附过程主要为化学吸附控制。
Using glutaraldehyde as cross-linking agent, the cross-linked chitosan resin was synthesized by grafting with thiourea to study the adsorption properties of Au (Ⅲ). The effects of pH value, adsorption temperature, adsorption time and other factors Effect of adsorption process. The results show that the pH value of the solution has a great influence on the adsorption, and the optimal pH value is around 5.0. The isothermal adsorption data of Au (Ⅲ) in the experimental concentration and temperature range are better fitted to the Freundlich model. The macroscopic adsorption process For the endothermic process; adsorption kinetics consistent with quasi-second-order kinetic equation, the apparent activation energy was 41. 12kJ / mol, the adsorption process is mainly controlled by chemical adsorption.