Mitigation of membrane fouling is an important problem to be solved in the application of membrane technology. In this research, we synthesised a kind of Cu-MOF-74 by a facile and environmentally friendly method at room temperature. This kind of Cu-MOF-74 was firstly and successfully coated on poly (vinylidene fluoride) (PVDF) membranes for improving their anti-biofouling performance. The experimental results show that Cu-MOF-74 increases the hydrophilicity and roughness of the PVDF membrane surface, and the antibacterial efficiency of the modified membrane was as high as 97.7% at 4 h. Moreover, we found that the Cu-MOF-74 could sustainably release Cu²⁺ for one week, the maximum Cu²⁺ release concentration of PVDF membrane coated by 0.025 g Cu-MOF-74 reached 0.42 mg/L, and the generation of Cu²⁺ played a significant role in suppressing E. coli. In the meantime, this kind of Cu-MOF-74 can release OH, which will lead to the accumulation of reactive oxygen species (ROS) in bacterial cells. The ·OH can oxidise and destroy bacterial cells, which will be in favour of enhancing the anti-biofouling performance. This novel PVDF membrane surface modified by green synthetic Cu-MOF-74 has a strong antibacterial property and high application potential for water treatment.

减轻膜污染是膜技术应用中要解决的重要问题。在这项研究中，我们在室温下通过一种简便且环保的方法合成了一种Cu-MOF-74。这种Cu-MOF-74首次成功地涂覆在聚偏二氟乙烯（PVDF）膜上，以提高其抗生物结垢性能。实验结果表明，Cu-MOF-74提高了PVDF膜表面的亲水性和粗糙度，改性膜在4 h的抑菌率高达97.7％。此外，我们发现Cu-MOF-74可以持续释放Cu ²⁺一星期，最大Cu ²⁺0.025 g Cu-MOF-74包覆的PVDF膜的释放浓度达到0.42 mg / L，Cu ²⁺的产生在抑制大肠杆菌中起重要作用。同时，这种Cu-MOF-74可以释放OH，这将导致细菌细胞中活性氧（ROS）的积累。·OH可以氧化并破坏细菌细胞，这将有利于增强抗生物污垢性能。经绿色合成Cu-MOF-74改性的新型PVDF膜表面具有很强的抗菌性能，在水处理中具有很高的应用潜力。