Jun Dukwoo, Xiao Minhao, Honda Ryo, Mahendra Shaily, Kaner Richard B, Hoek Eric M V
Division of Climate Technology Cooperation Green Technology Center Korea (GTCK), 17th fl. Namsan Square Bldg, 173, Toegye-ro, Jung-gu, Seoul 04554, Republic of Korea.
Department of Civil & Environmental Engineering, University of California, Los Angeles (UCLA), Los Angeles, California 90095, United States.
ACS Appl Mater Interfaces. 2024 Feb 28;16(8):10845-10855. doi: 10.1021/acsami.3c15488. Epub 2024 Feb 15.
This study set out to uncover which interfacial properties have the greatest impact on membrane organic fouling, biofouling, and fouling resistance. A relatively simple manipulation of the basic equations used in determining Lifshitz-van der Waals (LW) and Lewis acid-base (AB) surface tensions for solid materials reveals that the high electron accepticity of water makes the electron donicity of membrane and biofouling materials the key component governing their interfacial free energy of adhesion (Δ), which defines the favorability (or unfavorability) of one material (1) adhering to another (2) when immersed in a liquid (3). Various biofoulant and membrane LW and AB surface tensions were systematically characterized. Static bacterial adhesion, alginic acid filtration, and wastewater filtration tests were conducted to determine the fouling propensities of three different polymeric membrane materials. Experimental results of microbial adhesion, alginate fouling, and biofouling tests all correlated well with membrane electron density, where higher electron density produced less organic fouling or biofouling. These combined theoretical and experimental results confirm the importance of surface electron donicity in determining the fouling propensity of polymeric membranes.
本研究旨在揭示哪些界面性质对膜的有机污染、生物污染及抗污染性能影响最大。对用于确定固体材料的 Lifshitz - van der Waals（LW）和 Lewis 酸碱（AB）表面张力的基本方程进行相对简单的处理后发现，水的高电子接受性使得膜和生物污染材料的电子给予性成为决定其界面粘附自由能（Δ）的关键因素，该界面粘附自由能定义了一种材料（1）在浸入液体（3）时附着于另一种材料（2）的有利程度（或不利程度）。系统地表征了各种生物污染物以及膜的 LW 和 AB 表面张力。进行了静态细菌粘附、海藻酸过滤及废水过滤试验，以确定三种不同聚合物膜材料的污染倾向。微生物粘附、海藻酸盐污染及生物污染试验的实验结果均与膜电子密度密切相关，电子密度越高，有机污染或生物污染越少。这些理论与实验相结合的结果证实了表面电子给予性在决定聚合物膜污染倾向方面的重要性。
