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首页> 外文期刊>RSC Advances >New insights into the organic fouling mechanism of an in situ Ca2+ modified thin film composite forward osmosis membrane
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New insights into the organic fouling mechanism of an in situ Ca2+ modified thin film composite forward osmosis membrane

机译：原位Ca2 +修饰的薄膜复合正渗透膜有机结垢机理的新见解

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In this study, the effect of organic substances on the fouling behavior of a thin film composite (TFC) membrane with in situ Ca ~(2+) addition (TFC-Ca membrane) was evaluated. Bovine serum albumin (BSA), humic acid (HA) and sodium alginate (SA) were used as surrogate foulants for protein, natural organic substances and polysaccharides, respectively, thus enabling the analysis of foulant–membrane interaction in the membrane fouling process. Fouling experiments were carried out and the fouling mechanism was investigated by extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory. SEM-EDX, ICP-OES and TOC analysis were applied to characterize the fouled TFC-Ca membrane. Results suggested that the interfacial free energies obtained from advanced contact angle measurements were correlated strongly with the rates of membrane fouling. In situ Ca ~(2+) addition in the TFC membrane resulted in the decrease of the interfacial adhesion free energy ( i.e. , foulant–membrane interaction) and thus the mitigation of membrane fouling. The permeate flux of TFC-Ca FO membrane after organic fouling could be fully restored by simple physical cleaning. The antifouling mechanism of Ca ~(2+) pre-binding carboxyl groups in the TFC-Ca FO membrane was demonstrated, which provides new insights into the development of antifouling TFC membranes in the future.
机译：在这项研究中，评估了有机物质对原位添加Ca〜（2+）的薄膜复合材料（TFC-Ca膜）的结垢行为的影响。牛血清白蛋白（BSA），腐殖酸（HA）和海藻酸钠（SA）分别用作蛋白质，天然有机物质和多糖的替代污垢剂，因此可以分析膜污垢过程中的污垢-膜相互作用。进行了结垢实验，并通过扩展的Derjaguin–Landau–Verwey–Overbeek（XDLVO）理论研究了结垢机理。 SEM-EDX，ICP-OES和TOC分析用于表征结垢的TFC-Ca膜。结果表明，从先进的接触角测量获得的界面自由能与膜污染的速率密切相关。在TFC膜中原位添加Ca〜（2+）导致界面粘附自由能的降低（即污垢与膜的相互作用），从而减轻了膜的结垢。通过简单的物理清洁就可以完全恢复有机污垢后TFC-Ca FO膜的渗透通量。证明了TFC-Ca FO膜中Ca〜（2+）预结合羧基的防污机理，为今后防污TFC膜的发展提供了新的见识。

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