New insights into the organic fouling mechanism of an in situ Ca(2+) modified thin film composite forward osmosis membrane.
New insights into the organic fouling mechanism of an in situ Ca(2+) modified thin film composite forward osmosis membrane.
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原位Ca2改性薄膜复合正渗透膜有机污染机理的新见解
DOI：
10.1039/c9ra06272f
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发表时间：
2019-11-19
期刊：
影响因子：
3.9
通讯作者：
Cui, Fuyi
中科院分区：
文献类型：
--
作者：
Hao, Xiujuan;Gao, Shanshan;Tian, Jiayu;Wang, Songxue;Zhang, Huizhong;Sun, Yan;Shi, Wenxin;Cui, Fuyi
在这项研究中，有机物对薄膜复合（TFC）膜与原位钙添加（TFC-Ca膜）的污染行为的影响进行了评价。以牛血清白蛋白（BSA）、腐殖酸（HA）和海藻酸钠（SA）分别作为蛋白质、天然有机物和多糖的污染物替代物，研究了膜污染过程中污染物与膜的相互作用。进行了结垢实验，并采用扩展的Derjaguin-Landau-Verwey-Overbeek（XDLVO）理论研究了结垢机理。采用SEM-EDX、ICP-OES和TOC分析等方法对污染的TFC-Ca膜进行表征。结果表明，从先进的接触角测量得到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-膜相互作用），从而减轻膜污垢。TFC-Ca FO膜有机污染后的渗透通量可通过简单的物理清洗得到完全恢复。初步探讨了TFC-Ca FO膜中Ca 2+预结合羧基的脱钙机理，为TFC-Ca FO膜的研究提供了新的思路。
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.
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