研究报告
孙凯祥,杜春慧,李静,吴春金,朱娇红.聚离子液体修饰荷电超滤复合膜的构建及其抗污染性分析[J].环境科学学报,2016,36(3):834-841
聚离子液体修饰荷电超滤复合膜的构建及其抗污染性分析
- Fabrication and anti-fouling properties of positively charged composite ultrafiltration membranes modified by poly(ionic liquids)
- 基金项目：国家自然科学基金青年基金(No.51103130);浙江省自然科学基金(No.LY15B040001)
- 作者
- 单位
- 孙凯祥
- 浙江工商大学环境科学与工程学院, 杭州 310018
- 杜春慧
- 浙江工商大学环境科学与工程学院, 杭州 310018
- 李静
- 浙江工商大学环境科学与工程学院, 杭州 310018
- 吴春金
- 浙江工商大学环境科学与工程学院, 杭州 310018
- 朱娇红
- 浙江工商大学环境科学与工程学院, 杭州 310018
- 摘要：以氯化-1-烯丙基-3-乙烯基咪唑离子液体为反应单体,偶氮二异丁腈(AIBN)为引发剂,通过自由基聚合先合成聚离子液体预聚物,并将其与聚偏氟乙烯(PVDF)、聚乙二醇(PEG)进一步共混反应,以制备聚离子液体/PVDF共混铸膜液.然后将该铸膜液在聚丙烯(PP)微孔膜表面进行涂覆成膜,以制备具有互穿网络结构的聚离子液体/PVDF荷电复合膜.采用红外光谱、扫描电镜、Zeta电位计等对复合膜表面的化学结构、形貌及荷电性能等进行分析,并采用水通量测定仪对复合膜的纯水通量及蛋白质和染料的分离性能等进行了研究.结果表明,该复合膜表面具有较好的荷电性能,且随聚离子液体的加入可以有效提高膜的亲水性和抗污染性,复合膜M2的纯水通量可达到101.7 L·m-2·h-1,该膜对溶菌酶和染料罗丹明6G的截留率分别为88.0%和94.1%,该分离膜经清水反冲洗后通量恢复率分别达到72.5%和91.8%.
- Abstract：Poly (ionic liquid) prepolymer was synthesized through radical polymerization using 1-allyl-3-vinylimidazolium chloride as the reactive monomer and AIBN as the initiator. The prepolymer, polyvinylidene fluoride(PVDF) and pore forming agent PEG2000 were blended to prepare poly(ionic liquid)/PVDF reactive blends. Then, the reactive blends were casted onto the surface of PP microporous membrane to fabricate the cross-linking poly(ionic liquid)/PVDF charged composite membrane. Fourier transform infrared spectrometer (FTIR), scanning electron microscope (SEM) and zeta potential instrument were all applied to investigate the chemical structure, morphology and surface charged properties of the membranes. The water flux and separation property for lysozyme(LYZ) and rhodamine 6G solutions were all evaluated using an ultrafiltration device. The results indicate that the membrane surface was well charged. The highest water flux of M2 membrane was 101.7 L·m-2·h-1, the rejection of M2 to LYZ and rhodamine 6G were 88.0% and 94.1%, respectively. After being backwashed by pure water, their flux recovery ratios reached to 72.5% and 91.8%, respectively. These results all exhibite that the composite membrane had good water flux and anti-fouling properties.
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