Catechol-amine co-deposition membranes have garnered significant interest in enzyme immobilization, yet the deposited coating leads to excessive mass transfer resistance, negatively impacting membrane filtration performance. This work adjusts polyphenol deposition by utilizing the co-deposition structure with tannic acid (TA) and 3-aminopropyltriethoxysilane (APTES) with glycerol to enhance the filtration capability while maintaining enzyme activity. The glycerol addition has brought in a structural transition from dense nanosphere stacking to the loose flaky structure of greater bulkiness. Consequently, the resulting membrane showed a 69% of permeability improvement along with improved enzyme activity post-adjustment. In oil-water separation cycle tests, the biocatalytic membrane enabled the clarification of oil emulsions and facilitates offline self-cleaning, maintaining high permeability and recovery even after five cycles of heavy oil (4 g/L) filtration, showing great application potential in edible oil-water separation. The biocatalytic membrane of this work, derived from biomass and characterized by its facile preparation and minimal mass transfer resistance, presents a promising avenue for the integration of biocatalysis with filtration technologies within industrial production processes.

中文翻译：

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一种用于食用油水分离的具有可调节多酚沉积的自清洁生物催化膜


儿茶酚胺共沉积膜在酶固定化方面引起了极大的兴趣，但沉积的涂层会导致过大的传质阻力，从而对膜过滤性能产生负面影响。本研究利用与单宁酸 （TA） 和 3-氨基丙基三乙氧基硅烷 （APTES） 与甘油的共沉积结构来调整多酚沉积，以增强过滤能力，同时保持酶活性。甘油的添加带来了从致密纳米球堆叠到更大体积的松散片状结构的结构转变。因此，所得膜的通透性提高了 69%，调整后酶活性也得到了改善。在油水分离循环测试中，生物催化膜能够澄清油乳并促进离线自清洁，即使在重油 （4 g/L） 过滤 5 次循环后仍保持高渗透性和回收率，在食用油水分离中显示出巨大的应用潜力。这项工作的生物催化膜来源于生物质，其特点是制备简单且传质阻力小，为在工业生产过程中将生物催化与过滤技术相结合提供了一条有前途的途径。