In this study, a titanium dioxide/carbon dots (TiO₂/CDs) hydrophilic nanocomposite photocatalyst with different contents was embedded in the polyamide layer of reverse osmosis (RO) membrane via interfacial polymerization to increase desalination performance and antifouling properties. The modified membranes showed smoother surfaces with reduced contact angles, causing to improve membrane fouling resistance. TiO₂/CDs nanocomposite, due to its photocatalytic activity, showed more flux recovery ratio (FRR) after irradiation of UV light during the washing process. The FRR was enhanced from 94.4 to 97.1% for 0.01 wt% TiO₂/CDs RO membrane by UV irradiation. The hydrophilic functional groups with negative charge increased the desalination efficiency of the modified membranes (99.2% NaCl rejection for 0.01 wt% TiO₂/CDs membrane). The membrane containing 0.01 wt% TiO₂/CDs presented the highest pure water and NaCl solution flux of (59.6 and 54.6 L·m⁻²·h⁻¹) at 15 bar, respectively. In addition, the used nanoparticles improved the chlorine resistance of the membranes. As a result, TiO₂/CDs nanocomposite with little amounts could be applied as a suitable nanofiller to increase the permeability, antifouling properties, and chlorine resistance for RO membrane modification.

在本研究中，通过界面聚合将不同含量的二氧化钛/碳点（TiO ₂ /CDs）亲水性纳米复合光催化剂嵌入反渗透（RO）膜的聚酰胺层中，以提高脱盐性能和防污性能。改性后的膜表面更光滑，接触角减小，从而提高了膜的抗污染性。TiO ₂ /CDs纳米复合材料由于其光催化活性，在洗涤过程中紫外线照射后表现出更高的通量恢复率（FRR）。对于 0.01 wt% TiO ₂，FRR从 94.4% 提高到 97.1%/CDs RO 膜通过紫外线照射。带负电荷的亲水性官能团提高了改性膜的脱盐效率（0.01 wt% TiO ₂ /CDs 膜的NaCl 截留率为 99.2% ）。含有 0.01 wt% TiO ₂ /CDs的膜在 15 bar 下表现出最高的纯水和 NaCl 溶液通量（59.6 和 54.6 L·m ^-2 ·h ^-1）。此外，使用的纳米颗粒提高了膜的耐氯性。因此，少量的TiO ₂ /CDs 纳米复合材料可作为合适的纳米填料用于提高 RO 膜改性的渗透性、防污性和耐氯性。