氧化石墨烯修饰MoS_(2)-PAN吸附膜对铜离子吸附性能的影响

Adsorption performance of GO-MoS_(2) PAN membrane toward copper ions

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。

Molybdenum sulfide(MoS_(2))-polyacrylonitrile(PAN)was modified by GO,and GO-MoS_(2)-PAN modified adsorbent membrane was prepared by phase inversion method for Cu^(2+)adsorption from aqueous solution.The adsorbents were characterized by scanning electron microscopy(SEM),Fourier transformed infrared spectroscopy(FTIR)and contact angle test.The effects of different GO solid content on the porosity,pure water flux and contact angle of GO-MoS_(2)-PAN modified adsorbent membrane were investigated.When the pH of solution was 5 and the mass concentration of Cu^(2+)was 100 mg·L^(-1),the maximum equilibrium adsorption capacity of the modified adsorption membrane with 0.03%solid content of GO toward Cu^(2+)was 224.28 mg·g^(-1),and its desorption rate was 84%.The adsorption kinetic data fitted well to the pseudo-second-order model,and the isothermal adsorption data fitted well to Frenudlich isotherm model.The thermodynamic analysis indicated that the adsorption process was spontaneous and endothermic.