蛋白质及无机离子对纳滤膜去除PFOS的影响  

Effects of protein and inorganic ions on the removal of PFOS by nanofiltration membrane

作　　者：岳向雷 王磊[1] 王佳璇 梁童 吕永涛[1] YUE Xiang-lei;WANG Lei;WANG Jia-xuan;LIANG Tong;Lü Yong-tao(Shaanxi Key Laboratory of Membrane Separation,Shaanxi Membrane Separation Technology Research Institute,School of Environmental and Municipal Engineering,Xi’an University of Architecture and Technology,Xi′an 710055,China;School of Architecture and Civil Engineering,Xi′an University of Science and Technology,Xi′an 710054,China)

机构地区：[1]西安建筑科技大学环境与市政工程学院陕西省膜分离重点实验室陕西省膜分离技术研究院,陕西西安710055 [2]西安科技大学建筑与土木工程学院,陕西西安710054

出　　处：《中国环境科学》2019年第5期2007-2013,共7页China Environmental Science

基　　金：陕西省重点科技创新团队计划(2017KCT-19-01);陕西省重点产业链(群)项目(2017ZDCXL-GY-07-01);国家自然科学基金资助青年项目(51808442);西安科技大学博士启动基金资助项目(2018QDJ023)

摘　　要：以全氟辛烷磺酸(PFOS)为目标去除物,选取牛血清蛋白(BSA)为典型蛋白质类有机物,考察了BSA及其浓度,以及BSA与无机离子共存时,离子强度、离子种类对聚酰胺纳滤膜去除水中PFOS的影响.研究发现,原液中存在BSA时,PFOS的去除率有显著提高,而且BSA浓度越高,PFOS的去除率越高;当BSA与无机离子共存时,离子强度越大, PFOS去除率越高.这可能是因为BSA不但会吸附一部分PFOS,还会造成膜污染, BSA浓度越大,膜污染越严重,膜的筛分能力越强,且膜面与PFOS之间的静电排斥力越大,从而提高了PFOS的截留率.而无机离子的存在减小了BSA分子之间及与膜面之间的静电排斥力,使BSA污染层更加厚实,进一步增强了膜的筛分能力.此外, Ca^(2+)提高PFOS去除率的能力优于Na^+.With perfluorooctane sulfonate(PFOS) as the targeted matter and Bovine serum albumin(BSA) as the typical organic protein, we investigated the effects of BSA and its concentration, as well as ionic strength and ionic types when BSA coexisting with inorganic ions in feed water on PFOS removal by polyamide nanofiltration membrane in this study. The results showed that a significant improvement in PFOS removal rate was observed in the presence of BSA. The higher the concentration of BSA, the higher PFOS removal rate was. When BSA and inorganic ions coexisted in the feed solution, PFOS removal rate increased with the increase of ionic strength. This may be because BSA would not only absorb some PFOS, but also cause membrane fouling. The higher the BSA concentration, the more serious membrane fouling was. Consequently, the screening ability of fouled membrane and the electrostatic repulsion force between the membrane surface and PFOS were enhanced. Thus, the removal rate of PFOS increased.The existence of ions reduced the electrostatic repulsion force between BSA and the membrane surface, which resulted in thicker BSA fouling layers and enhanced membrane sieving capacity. Additionally, our experiments showed that the ability of Ca^2+ to improve PFOS rejection was better than that of Na^+.

关 键 词：全氟辛烷磺酸 纳滤膜 蛋白质 无机离子 

分 类 号：X131.2[环境科学与工程—环境科学]