State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China.
Water Res. 2022 Jul 15;220:118710. doi: 10.1016/j.watres.2022.118710. Epub 2022 Jun 3.
Endowing ceramic membrane (CM) catalytic reactivity can enhance membrane fouling control in the aid of in situ oxidation process. Peracetic acid (PAA) oxidant holds great prospect to integrate with CM for membrane fouling control, owing to the prominent advantages of high oxidation efficacy and easy activation. Herein, this study, for the first time, presented a PAA/CM catalytic filtration system achieving highly-efficient protein fouling alleviation. A FeOCl functionalized CM (FeOCl-CM) was synthesized, possessing high hydrophilicity, low surface roughness, and highly-efficient activation towards PAA oxidation. Using bovine serum albumin (BSA) as the model protein foulant, the PAA/FeOCl-CM catalytic filtration notably alleviated fouling occurring in both membrane pores and surface, and halved the flux reduction degree as compared with the conventional CM filtration. The PAA/FeOCl-CM catalytic oxidation allows quick and complete disintegration of BSA particles, via the breakage of the amide I and II bands and the ring opening of the aromatic amino acids (e.g., Tryptophan, Tyrosine). In-depth investigation revealed that the in situ generated OH and O were the key reactive species towards BSA degradation during catalytic filtration, while the organic radical oxidation and the direct electron transfer pathway from BSA to PAA via FeOCl-CM played minor roles. Overall, our findings highlight a new PAA/CM catalytic filtration strategy for achieving highly-efficient membrane fouling control and provide an understanding of the integrated PAA catalytic oxidation - membrane filtration behaviors.
赋予陶瓷膜（CM）催化活性可以增强原位氧化过程辅助下的膜污染控制。过氧乙酸（PAA）氧化剂由于具有高氧化效率和易于活化的突出优势，在与 CM 集成用于膜污染控制方面具有广阔的前景。在此，本研究首次提出了一种 PAA/CM 催化过滤系统，可实现高效的蛋白质污染缓解。合成了具有高亲水性、低表面粗糙度和高效 PAA 氧化活化能力的 FeOCl 功能化 CM（FeOCl-CM）。以牛血清白蛋白（BSA）为模型蛋白污染物，PAA/FeOCl-CM 催化过滤显著减轻了膜孔和表面发生的污染，通量降低程度比传统 CM 过滤降低了一半。与传统 CM 过滤相比，PAA/FeOCl-CM 催化氧化可快速且完全地使 BSA 颗粒解体，通过酰胺 I 和 II 带的断裂以及芳香族氨基酸（如色氨酸、酪氨酸）的环开裂。深入研究表明，在催化过滤过程中，原位生成的 OH 和 O 是 BSA 降解的关键活性物质，而有机自由基氧化和 FeOCl-CM 从 BSA 到 PAA 的直接电子转移途径则起到次要作用。总的来说，我们的研究结果强调了一种新的 PAA/CM 催化过滤策略，可实现高效的膜污染控制，并深入了解了集成 PAA 催化氧化-膜过滤行为。
