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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：进入原位CA2 +改性薄膜复合前渗透膜的有机污垢机制的新见解

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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 Ca2+ 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 Ca2+ 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 Ca2+ 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：在该研究中，评价有机物质对薄膜复合（TFC）膜与原位CA2 +添加（TFC-CA膜）的污垢行为的影响。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，从而能够分析膜污垢过程中的污垢膜相互作用。进行了污染实验，并通过延长Derjaguin-Landau-Verwey-verwey-verwey-verwey-verwey-verwey-verwey-verwey-verwey-hypek（xdlvo）理论进行了结垢机制。应用SEM-EDX，ICP-OES和TOC分析来表征污染的TFC-CA膜。结果表明，从先进的接触角测量获得的界面自由能量与膜污垢的速率强烈相关。原位CA2 +加入TFC膜导致界面粘合能量（即，污垢 - 膜相互作用）的降低，从而减轻膜污染。通过简单的物理清洁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Ca2 +预结合羧基的防污机制，为未来的防污TFC膜的开发提供了新的洞察。

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    《RSC Advances》 |2019年第65期|共8页
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  • 正文语种 eng
  • 中图分类 化学;
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