The photocatalytic efficiency of conventional blending photocatalytic membranes suffers a significant reduction due to effective photocatalyst embedded in membrane matrix. Therefore, in this study, inspired by the bioadhesive technology of polydopamine (pDA), a novel Ti doped bismuth oxyiodide (BiOI)-polydopamine (pDA)-coated cellulose acetate (CA) (Ti/BiOI-pDA/CA) photocatalytic nanocomposite membranes were successfully developed for effective removal of tetracycline (TC). The Ti/BiOI-pDA/CA nanocomposite membranes displayed very high photocatalytic activity toward TC (about 98% after 120 min) under visible light irradiation and superior photodegradation kinetics (k=0.03214 min⁻¹). The removal rate of Ti/BiOI/-pDA/CA nanocomposite membranes under dynamic cyclic degradation system could be further improved, giving TC removal efficiency of 91% in 60min. Remarkably, the permeate flux, flux recovery ratio (FRR), reversible fouling (Rr), irreversible fouling (Rir) and the total fouling ratio (Rt) revealed the Ti/BiOI-pDA/CA nanocomposite membranes had excellent antifouling performance. In addition, the Ti/BiOI-pDA/CA nanocomposite membranes exhibited excellent stability and reusability. Therefore, this work gives insight into the effective removal of TC wastewater and has a great potential for new generation of high-performance photocatalytic membranes for practical wastewater treatment in the future.

常规混合光催化膜的光催化效率由于嵌入在膜基质中的有效光催化剂而显着降低。因此，在这项研究中，受聚多巴胺（pDA）的生物粘附技术的启发，一种新型的Ti掺杂的碘氧化铋（BiOI）-聚多巴胺（pDA）涂覆的醋酸纤维素（CA）（Ti / BiOI-pDA / CA）光催化纳米复合膜成功开发出可有效去除四环素（TC）的产品。Ti / BiOI-pDA / CA纳米复合膜在可见光照射下表现出对TC的很高的光催化活性（120分钟后约98％），并且具有优异的光降解动力学（k = 0.03214 min ^-1）。在动态循环降解系统下，Ti / BiOI / -pDA / CA纳米复合膜的去除率可以进一步提高，在60min内TC去除率达到91％。值得注意的是，渗透通量，通量回收率（FRR），可逆结垢（Rr），不可逆结垢（Rir）和总结垢率（Rt）表明Ti / BiOI-pDA / CA纳米复合膜具有出色的防污性能。此外，Ti / BiOI-pDA / CA纳米复合膜表现出出色的稳定性和可重复使用性。因此，这项工作为有效去除TC废水提供了见识，并为将来用于实际废水处理的新一代高性能光催化膜具有巨大潜力。