Degradation of tetracycline wastewater by Fe-TiO2/Bi2MoO6/PTFE photocatalytic composite membrane

• Published in: Applied surface science Vol. 669; p. 160500
• Main Authors: Wang, Zijing, Chen, Wenhui, Zhang, Mai, Zhang, Manying, Fu, Xiaofei, Gao, Yong
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.10.2024
• Subjects: Bi2MoO6; Fe-doped titanium dioxide; Membrane; Photocatalysis; PTFE; Membrane; Bi2MoO6; Fe-doped titanium dioxide; Photocatalysis; PTFE
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2024.160500

[Display omitted] •Hydrothermal synthesis of photocatalyst nanoparticles for a novable photocatalytic composite membrane by vacuum filtration and used to remove TCH wastewater.•Use synergistic action of adsorption, filtration and photocatalysis to remove TCH wastewater.•The introduction of Fe3+ leads to a significant dispersion of Bi2MoO6 aggregation and enhances the hydrophilic properties of the composite membrane. A Fe-TiO2/Bi2MoO6/PTFE photocatalytic composite membrane was innovatively fabricated for TCH wastewater treatment. It was characterized by XRD, SEM-EDS, FT-IR, BET, XPS, UV–vis, water contact angle, membrane flux, and BSA adsorption. The Fe-TiO2/Bi2MoO6 particles were securely adhered to the PTFE membrane, confirmed by repeated tests, exhibiting remarkable stability. The addition of Fe3+ and the incorporation of TiO2 increased the surface area, while the formation of the Fe-TiO2/Bi2MoO6 heterojunction facilitated the efficient separation of photogenerated electron-hole pairs. Furthermore, the doping of Fe3+ simultaneously disperses TiO2 and Bi2MoO6, enhancing their interactions. This leads to a close bonding between TiO2, Bi2MoO6, and Fe3+, further enhancing the hydrophilicity of the composite membrane. Treating TCH wastewater for 2 h with Fe-TiO2/Bi2MoO6/PTFE composite membrane under UV light achieved 87.4 % TCH removal and up to 76.1 % TOC reduction. The presence of inorganic anions (Cl−, CO32−, and NO3−) and humic acid (HA) have an inhibitory effect on the removal of TCH. The free radical trapping experiment identifies ·O2− as the primary reactive species. The E. coli colony assay shows no notable antibacterial activity in the treated effluent. LC-MS analysis reveals possible TCH degradation pathways in wastewater at different times.