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目的研究交联壳聚糖膜固载纳米MnO2对水中汞的去除性能。方法采用溶液共混法制备壳聚糖负载纳米MnO2膜,研究了其在不同pH值(2～12)、不同吸附时间(5～120 min)和温度(25～45℃)下对汞的去除效果,并拟合了吸附动力学模型。结果在本实验条件下,壳聚糖负载纳米MnO2膜去除汞的最佳条件为pH 6,吸附时间为30 min,温度为25℃,对初始浓度为2 mg/L的汞溶液吸附平衡后去除率为96.8%。该复合膜对汞的吸附动力学符合准二级模型,相关系数为1。结论壳聚糖负载纳米MnO2是去除含汞废水的有效材料,并解决了纳米MnO2不易与水分离的难题。
Objective To study the removal of mercury from water by cross-linked chitosan membrane immobilized nano-MnO2. Methods The nanocomposite MnO2 membranes were prepared by solution blending method. The removal of mercury at different pH values (2 ~ 12), different adsorption time (5 ~ 120 min) and temperature (25 ~ 45 ℃) Effect, and fit the adsorption kinetics model. Results Under the experimental conditions, the optimal conditions for the removal of mercury from chitosan nanofilms were pH 6, the adsorption time was 30 min, the temperature was 25 ℃, and the mercury solution with the initial concentration of 2 mg / L was adsorbed and equilibrated. The rate is 96.8%. The adsorption kinetics of mercury on the composite membrane accords with the quasi - second order model with a correlation coefficient of 1. Conclusion Chitosan loaded nano-MnO2 is an effective material to remove mercury-containing wastewater and solve the problem that nano-MnO2 is not easily separated from water.