将离子液体（IL）1-乙基-3-甲基咪六氟磷酸盐（[EMIM]PF₆）、氧化石墨烯（GO）、聚乙烯吡咯烷酮K30（PVP）、聚偏氟乙烯（PVDF）、二甲基甲酰胺（DMF）共混制备IL/GO/PVP/PVDF改性超滤膜。以IL/GO复合添加剂为变量，测试了膜对Cd²⁺、Pb²⁺、Hg²⁺ 3种重金属离子的截留率和抗污染率，并探究了离子浓度和pH对膜截留性能的影响。结果表明，IL/GO的添加降低了超滤膜接触角，有效提高了膜表面的亲水性。当IL/GO复合添加剂质量分数为4%/0.6%时膜的综合性能最佳，对Cd²⁺、Pb²⁺、Hg²⁺的截留率可达96.31%、97.72%、96.47%，受污染后通量恢复率为79.24%、85.70%、82.28%。

IL/GO/PVP/PVDF modified ultrafiltration membrane is obtained by blending ionic liquid (IL) 1-ethyl-3-methyl imipene hexafluorophosphate ([EMIM]PF₆),graphene oxide (GO),polyvinylpyrrolidone K30 (PVP),polyvinylidene fluoride (PVDF) and dimethylformamide (DMF).With IL/GO compound additive as a variable,the membrane's rejection rate and anti-fouling rate to Cd²⁺,Pb²⁺ and Hg²⁺ are tested,and the influence of ion concentration and pH on the rejection performance of membrane is explored.The results identify that the addition of IL/GO reduces the contact angle of the ultrafiltration membrane and effectively improves the hydrophilicity of the membrane surface.When the content of IL/GO composite additive is 4%/0.6%,the overall performance of the membrane is the best,by which the rejection rates of Cd²⁺,Pb²⁺ and Hg²⁺ can reach 96.31%,97.72% and 96.47%,respectively and the flux recovery rates after pollution are 79.24%,85.70% and 82.28%,respectively.

房平(1975-),男,博士,副教授,研究方向为水处理膜材料与技术,469493@qq.com;杜明山(1998-),男,硕士研究生,研究方向为水处理膜材料与技术,通讯联系人,1159736613@qq.com。