氧化石墨烯修饰MoS_(2)-PAN吸附膜对铜离子吸附性能的影响

通过氧化石墨烯(GO)对硫化钼(MoS_(2))-聚丙烯腈(PAN)进行改性处理,采用相转化法成功制备了对水溶液中Cu^(2+)进行吸附的GO-MoS_(2)-PAN改性吸附膜。通过扫描电镜(SEM)、傅里叶变换红外光谱(FTIR)及接触角测试对该吸附剂材料进行了表征。探究了不同GO固含量对GO-MoS_(2)-PAN改性吸附膜的孔隙率、纯水通量以及接触角的影响。在pH为5、Cu^(2+)质量浓度为100 mg·L^(-1)的溶液中,GO固含量为0.03%的改性吸附膜对Cu^(2+)的最大平衡吸附量达到224.28 mg·g^(-1),且其脱附率为84%。结果表明,改性吸附膜对溶液中Cu^(2+)的吸附动力学符合准二级动力学模型,等温吸附过程符合Freundlich等温吸附模型,热力学分析结果表明该吸附过程为自发吸热过程。

Recovery Properties of Polysulfone Hollow Fiber Chelating Membrane Modified with Thiourea for Mercury (Ⅱ)

The adsorption isotherms of the polysulfone hollow fiber chelating membrane modified with thionrea as chelating groups for Hg^2＋ were determined. The effects of mobile phase conditions and the operating parameters on removal performance of the chelating membrane for Hg^2＋ were also investigated. The recovery of Hg^2＋ decreased at low pH and the optimum range of pH was from 6 to 7. The feed concentration effected on recovery of Hg^2＋ at the specified loading amount of Hg^2＋. The Hg^2＋ could be removed from different concentration feed solution by chelating membrane. The increase of feed flow rate led to slight decrease of recovery of Hg^2＋ at the specified loading amount of Hg^2＋. The chelating membrane could be operated at height feed flow rate and a large-scale removal of H^2＋ could be realized. With the increase of load amount, Hg^2＋ recovery decreased, but the saturation degree of chelating membrane increased. According to required recovery of H^2＋ and the saturation degree of chelating membrane, the optimum loading amount of Hg^2＋ should be selected in the actual removal of H^2＋.