【作者】 秦振平； 耿常乐； 刘燕； 纪树兰； 郭红霞；

【Author】 QIN Zhenping;GENG Changle;LIU Yan;JI Shulan;GUO Hongxia;College of Environnental and Energy Engineering;Beijing Key Laboratory for Green Catalysis and Separation;Shijiazhuang CSD E.P.facilities operating Ltd.Co.;Beijing Ketaixingda High Technology Ltd.Co.;College of Materials Science and Engineering,Beijing University of Technology;

【机构】 北京工业大学环境与能源工程学院； 北京市绿色催化与分离重点实验室； 石家庄中持环保设施运营有限公司； 北京科泰兴达高新技术有限公司； 北京工业大学材料科学与工程学院；

【摘要】 采用戊二醛（GA）为交联剂,硫酸（H₂SO₄）为催化剂,对层层自组装（LbL）制备的（PEI/PSS）_4.5-PAN复合纳滤膜进行交联改性,红外光谱（FTIR）和热分析（DCS）表征了交联前后复合膜的结构,研究了交联前后的复合膜纳滤截留Ni²⁺性能变化.结果表明,交联度增大,聚电解质的热稳定性越大;当交联剂浓度为5.0wt%,催化剂浓度为0.50wt%,30℃交联24 h后,交联改性复合膜对500 mg/LNiCl₂溶液的截留率为98.8%,单位压力下通量为24.6 L/（m²·h）;与未交联改性复合纳滤膜相比,复合膜的截留率有所提高,同时还保持较高的通量,并显示良好的长期运行稳定性.更多还原

【Abstract】 The（PEI/PSS）_4.5-PAN composite membrane prepared by layer-by-layer self-assembly method was cross-linked using glutaraldehyde（GA） as crosslinking agent and sulfuric acid（H₂SO₄） as catalyst.The structure of the membrane was characterized by FTIR and DCS,and the nanofiltration retention of Ni²⁺ was also investigated.The results showed that the thermos stability of the membrane increased with increasing crosslinking degree.When the concentration of GA was 5.0wt%,and the concentration of H₂SO₄ was 0.50wt%,cross-linking at 30 ℃ for 24 h,the obtained cross-linked（PEI/PSS）_4.- PAN composite membrane showed 98.8%retention ratio for 500 mg/L of Ni²⁺ solution,along with the flux of24.6 L/（m² · h · MPa）.Compared to the uncrosslinked pristine membrane,the crosslinked composite nanofiltration membrane showed an improved rejection ratio and flux,with a long-term running stability.更多还原