具有半互穿网络结构的PDMS/PVDF超滤膜处理水包油型废水研究

Disposal of Oil-in-Water Wastewater by PDMS/PVDF Ultrafiltration Membrane with Semi-IPN Structure

以聚二甲基硅氧烷(PDMS)和聚偏氟乙烯(PVDF)共混,正硅酸乙酯(TEOS)交联PDMS,采用浸没沉淀相转化法(NIPs),制备出具有半互穿聚合物网络(semi-IPN)结构的PDMS/PVDF微孔膜,并用于水包油(O/W)型乳化废水的处理。研究了TEOS用量、料液压力、料液温度及料液浓度对膜分离性能的影响。结果表明,膜通量随着TEOS用量的增加,通量变小,油去除率增大;随着料液压力、料液温度以及料液浓度的增加,通量增加;膜通量最高可达31.93 L/m^2·h;油去除率最高可达60.3%。

In this paper,a semi-interpenetrating(IPN)structural polydimethylsiloxane(PDMS)/polyvinylidene fluoride(PVDF)microporous membrane was prepared by a non-solvent induced phase separation method with tetraethyl orthosilicate(TEOS)as a crosslinking agent and then applied for the disposal of oil-in-water-type emulsified wastewater.The effect of operation conditions such as feed pressure,feed temperature and feed concentration on the separation performance of the membrane were studied.The experimental results indicated that the flux decreased with an increase of TEOS dosage,and however the oil removal efficiency was enhanced.Moreover,the flux was also improved with the increase of feed pressure,temperature and concentration,and the membrane achieved a maximum value of 31.93 L/m^2·h in flux.The membrane exhibited an opposite trend in oil removal efficiency with the membrane flux,and its maximum efficiency reached 60.3%.