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以哌嗪(PIP)和均三苯甲酰氯(TMC)为两相单体,在聚醚砜(PES)基膜表面进行界面聚合反应得到TFC膜,进而通过添加2-氯-1-甲基吡啶鎓碘化物活化接枝树状大分子改性制备了荷正电聚酰胺复合纳滤膜(G-TFC)。研究了3种膜的结构和性质,以及G-TFC膜对3种重金属离子的去除情况。结果表明,改性后的G-TFC膜亲水性增加,接触角由75.0°±2.0°降至46.9°±3.5°,且等电点提高至9.9 m V。G-TFC膜对质量浓度50~500 mg/L的单一Cu~(2+)、Ni~(2+)和Pb~(2+)离子溶液的通量在25~30 L/(m~2·h),截留率均>90%,且满足Cu~(2+)>Ni~(2+)>Pb~(2+)的规律;对混合Cu~(2+)、Ni~(2+)和Pb~(2+)溶液的通量为30.6 L/(m~2·h),对Cu~(2+)和Pb~(2+)的截留率>96%。
An interfacial polymerization reaction of PIP and TMC on the surface of polyethersulfone (PES) membrane resulted in the formation of TFC membrane, which was further purified by adding 2-chloro-1-methyl Pyridinium iodide activated grafted dendrimer modified positively charged polyamide composite nanofiltration membrane (G-TFC). The structure and properties of three membranes were studied, and the removal of three kinds of heavy metal ions by G-TFC membrane was also studied. The results showed that the hydrophilicity of the modified G-TFC membrane increased, the contact angle decreased from 75.0 ° ± 2.0 ° to 46.9 ° ± 3.5 °, and the isoelectric point increased to 9.9 mV. The flux of single Cu 2+, Ni 2+ and Pb 2+ ions in the concentration range of 50 ~ 500 mg / L was 25 ~ 30 L / (m 2 · H), the rejection rates were both> 90%, and the rules of Cu 2+> Ni 2+> Pb 2+ were satisfied. For Cu 2 +, Ni 2+, ) And Pb 2+ solution was 30.6 L / (m ~ 2 · h) and the retention of Cu 2+ and Pb 2+ was> 96%.