利用牛血清蛋白(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Fd+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质量浓度达到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的增加,当pH为7时,膜污染最严重,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.
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