膜科学与技术

水中Fe3+与蛋白质共存时的膜污染机理研究

作者：吴颜，王磊，黄丹曦，王旭东，吕永涛，黄松，贾世发

单位：西安建筑科技大学环境与市政工程学院，陕西西安，710055

关键词：超滤膜；铁离子；牛血清蛋白（BSA）；膜污染；AFM

出版年,卷(期):页码： 2016,36(4):38-45

摘要：

本文利用BSA与FeCl3等配制的混合溶液模拟污水进行膜过滤实验，研究超滤膜中金属离子铁（Fe3+）与蛋白质（BSA）共存时对膜污染的影响。研究发现，在pH为3时，向BSA混合溶液中添加Fe3+会在一定程度上影响其对膜的污染程度。BSA与Fe3+之间存在静电相互作用从而形成胶体态物质是其产生影响的原因之一，在相同BSA浓度下，随着FeCl3浓度的增加，当FeCl3浓度达到20 mg/l时，膜污染最为严重.而在相同BSA与FeCl3浓度条件下，随着pH值的增加，当pH为7时，膜污染最为严重，这是由于此时BSA带负电，被带正电的铁离子沉淀层所吸附，在膜表面形成BSA/铁的聚合物。

In this work, we studied the effects of the coexisting metal ions of iron and protein fouling of ultrafiltration membranes, using BSA with a mixed solution of FeCl3 as simulated wastewater. The results show that the addition of Fe3+ into the BSA solution would cause more severe fouling at pH 3. And, at the same BSA concentration, the membrane exhibited a most sharply flux decline with 20 mg/l FeCl3 .However, membrane fouling behavior became more severely with pH increasing, the flux decline of the membrane was highest at pH 7.Because the BSA was adsorbed by the positively charged iron precipitate layer,which can easily interacted with Fe3+ and ferric compounds. Therefore, BSA/iron can more easily deposited onto the surface of the membrane.

第一作者简介：吴颜（1990.06-），女，河北承德，主要从事超滤膜水处理技术研究，*通讯联系人，王磊，wl0178@126.com.

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