紫外接枝改性聚偏氟乙烯膜及处理含酚废水研究

Study on PVDF Membrane Modification by UV-Induced Grafting for Phenol-Containing Wastewater Treatment

为提高支撑液膜萃取体系的稳定性,以苯乙烯为接枝单体、二苯甲酮(BP)为光引发剂,通过紫外接枝的方法对支撑体聚偏氟乙烯(PVDF)膜进行疏水改性,研究了制备改性膜的优化实验条件,对改性前后的PVDF膜的官能团、微观形貌和接触角进行了表征,并考察了原膜与改性膜构建的支撑液膜萃取体系处理含酚废水的能力。结果表明,制备改性膜的优化条件为:紫外光照时间15 min,反应温度30℃,接枝单体苯乙烯的质量分数4%,引发剂BP浓度0.3 mol/L。改性后的PVDF膜的接触角提高了76%,疏水性能显著提高。连续运行5次后,处理含酚废水改性膜除酚率比改性前提高了47%,体系运行更稳定。

In order to improve the stability of the SLM(support liquid membrane)extraction system,the support body polyvinylidene fluoride(PVDF)membrane was hydrophobically modified by UV-induced grafting method with styrene as the grafting monomer and BP as the photoinitiator.And the optimal experimental conditions for the production were determined,the functional groups,microcosmic morphology and contact angles of PVDF membrane before and after modification were analyzed,the ability of SLM extraction systems to treat phenol-containing wastewater using pristine membrane and modified membrane was investigated.The results showed that the optimal experimental conditions for the production were the reaction time of UVinduced grafting was 15 min,the system temperature was 30℃,the mass fraction of graft monomer styrene was 4%,the concentration of benzophenone was 0.3 mol/L.After modification,the contact angle of PVDF increased by 76%and the hydrophobicity of PVDF membrane was significantly increased.After running 5 times continuously,the phenol removal rate of the SLM extraction system constructed was 47%higher than that before the modification,the stability of the system could be significantly improved.