针对超滤膜在处理含油污水过程中膜污染严重的问题,采用自由基聚合法结合机械搅拌制备P(MAAc-co-MAAm)多氢键自组装凝胶微球,并通过分子间多氢键的作用沉积于羧基化的聚偏氟乙烯(PVDF)膜表面,制备凝胶微球改性PVDF超滤膜;通过动态光散...针对超滤膜在处理含油污水过程中膜污染严重的问题,采用自由基聚合法结合机械搅拌制备P(MAAc-co-MAAm)多氢键自组装凝胶微球,并通过分子间多氢键的作用沉积于羧基化的聚偏氟乙烯(PVDF)膜表面,制备凝胶微球改性PVDF超滤膜;通过动态光散射粒度分析仪测试微球粒径,采用场发射扫描电子显微镜及原子力显微镜观察膜表面形貌,并通过接触角、水下油滴粘附和油水乳液过滤等测试方法表征膜的性能。结果表明:微球平均粒径约248 nm,改性膜的水接触角最低可达25.4°±1.5°,且具有优异的水下抗油滴粘附性能。由40 mL P(MAAc-co-MAAm)凝胶微球悬浮液改性的PVDF膜对平均粒径为220 nm的正己烷水包油乳液的截留率高达99.8%,4次油水乳液循环测试后,通量恢复率高达85.2%,而原膜的通量恢复率仅为41.5%,说明凝胶微球改性膜具有优异的抗污染能力,同时保证了改性膜优异的分离性能。展开更多
A high performance composite membrane was prepared under the inspiration of bioadhesion principles for pervaporative dehydration of ethanol.Chitosan(CS)and polyacrylonitrile(PAN)ultrafiltration membranes were used as ...A high performance composite membrane was prepared under the inspiration of bioadhesion principles for pervaporative dehydration of ethanol.Chitosan(CS)and polyacrylonitrile(PAN)ultrafiltration membranes were used as the active layer and the support layer,respectively.Guar gum(GG),a natural bioadhesive,was introduced as the intermediate bonding layer to improve the separation performance and stability of the fabricated CS/GG/PAN composite membranes.The contact angle of the GG layer was just between those of the CS layer and the PAN layer,minimizing the difference of hydrophilicity between the active layer and the support layer.The peeling strength of the composite membrane was significantly enhanced after the introduction of the GG layer.The effects of preparation conditions and operation conditions including GG concentration,operating temperature and ethanol concentration in feed on the pervaporation performance were investigated.The as-fabricated CS/GG/PAN composite membrane showed the optimum performance with a permeation flux of up to804 g·m-2·h-1and a separation factor higher than 1900.Besides,the composite membranes exhibited a desirable long-term operational stability.展开更多
文摘针对超滤膜在处理含油污水过程中膜污染严重的问题,采用自由基聚合法结合机械搅拌制备P(MAAc-co-MAAm)多氢键自组装凝胶微球,并通过分子间多氢键的作用沉积于羧基化的聚偏氟乙烯(PVDF)膜表面,制备凝胶微球改性PVDF超滤膜;通过动态光散射粒度分析仪测试微球粒径,采用场发射扫描电子显微镜及原子力显微镜观察膜表面形貌,并通过接触角、水下油滴粘附和油水乳液过滤等测试方法表征膜的性能。结果表明:微球平均粒径约248 nm,改性膜的水接触角最低可达25.4°±1.5°,且具有优异的水下抗油滴粘附性能。由40 mL P(MAAc-co-MAAm)凝胶微球悬浮液改性的PVDF膜对平均粒径为220 nm的正己烷水包油乳液的截留率高达99.8%,4次油水乳液循环测试后,通量恢复率高达85.2%,而原膜的通量恢复率仅为41.5%,说明凝胶微球改性膜具有优异的抗污染能力,同时保证了改性膜优异的分离性能。
基金Supported by the New Century Excellent Talents in University(NCET-10-0623)the National Natural Science Foundation for Distinguished Young Scholars(21125627)+1 种基金the National Basic Research Program of China(2009CB623404)State Key Laboratory for Modification of Chemical Fibers and Polymer Materials(Dong Hua University)
文摘A high performance composite membrane was prepared under the inspiration of bioadhesion principles for pervaporative dehydration of ethanol.Chitosan(CS)and polyacrylonitrile(PAN)ultrafiltration membranes were used as the active layer and the support layer,respectively.Guar gum(GG),a natural bioadhesive,was introduced as the intermediate bonding layer to improve the separation performance and stability of the fabricated CS/GG/PAN composite membranes.The contact angle of the GG layer was just between those of the CS layer and the PAN layer,minimizing the difference of hydrophilicity between the active layer and the support layer.The peeling strength of the composite membrane was significantly enhanced after the introduction of the GG layer.The effects of preparation conditions and operation conditions including GG concentration,operating temperature and ethanol concentration in feed on the pervaporation performance were investigated.The as-fabricated CS/GG/PAN composite membrane showed the optimum performance with a permeation flux of up to804 g·m-2·h-1and a separation factor higher than 1900.Besides,the composite membranes exhibited a desirable long-term operational stability.
