Wastewater discharged from the textile industry contains large amounts of dyes and salts, causing serious pollution to the environment. Loose nanofiltration (LNF) membranes offer a promising solution for dye/salt separation. However, membrane fouling is a critical issue affecting the membrane performance. Here, polyether amine (PEA) is used as the aqueous monomer for interfacial polymerization to prepare a polyamide (PA) LNF membrane, and peroxidase-like Cu-FeTCPP nanosheets are embedded into the PA layer to develop the Nanozyme@PA membrane. The nanozyme-incorporated membrane has a thinner and enhanced porous active layer than PA membrane, resulting in higher water permeance (maximum of 80.7 L·m⁻²·h⁻²·bar⁻¹), notable rejection of dyes (CR, >99.2 %) but low rejection of inorganic ions (NaCl, <6.4 %). The optimum dye/salt separation factor of Nanozyme@PA reaches 218.7. The loaded nanozyme can catalyze the degradation of dyes adsorbed on the membrane surface in the presence of hydrogen peroxide within 10 min, without the need for special operation, enabling the recovery of water permeance. This nanozyme functionalized LNF membrane with good permeability, selectivity and self-cleaning offers an efficient approach to dye wastewater treatment as well as an insight for membrane fabrication assisted by two-dimensional nanozyme.

中文翻译：

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二维 Cu-FeTCPP 纳米酶掺入具有自清洁特性的松散纳滤膜，用于染料/盐分离


纺织工业排放的废水中含有大量的染料和盐类，对环境造成严重污染。松散纳滤 （LNF） 膜为染料/盐分离提供了一种很有前途的解决方案。然而，膜污染是影响膜性能的关键问题。在这里，聚醚胺 （PEA） 用作界面聚合的水性单体以制备聚酰胺 （PA） LNF 膜，并将过氧化物酶样 Cu-FeTCPP 纳米片嵌入 PA 层以显影Nanozyme@PA膜。纳米酶掺入的膜具有比 PA 膜更薄且增强的多孔活性层，导致更高的透水性（最大值为 80.7 L·m⁻²·h⁻²·bar⁻¹），对染料的明显排斥（CR，>99.2%），但对无机离子的排斥率低（NaCl，<6.4%）。Nanozyme@PA 的最佳染料/盐分离因子达到 218.7。负载的纳米酶可在过氧化氢存在下 10 分钟内催化吸附在膜表面的染料降解，无需特殊操作，能够恢复透水性。这种纳米酶功能化的 LNF 膜具有良好的渗透性、选择性和自清洁性，为染料废水处理提供了一种有效的方法，并为二维纳米酶辅助的膜制造提供了见解。