NH2-MIL-88B(Fe)/TiO2/PAN electrostatically spun nanofiber membrane for photocatalytic degradation of tetracycline and oil-water separation

Excessive discharge of tetracycline (TC) poses a threat to the environment and human health, and finding a costeffective treatment method to remove TC from water remains a challenge. In this study, NH2-MIL-88B(Fe)/TiO2/ PAN (NMTP) electrostatically spun nanofibrous membranes (ENMs) were prepared, and the NMTP nanofibrous membranes were characterized by water contact angle test, UV-vis and other characterization methods. The results showed that the introduction of NH2-MIL-88B(Fe) expanded the light response range of ENMs, accelerated the production of active substances (center dot O2- and center dot OH) and improved the hydrophilicity of the membranes, which resulted in the excellent photocatalytic performance and oil-water separation ability of NMTP ENMs. Among them, the degradation efficiencies of NMTP-4 ENMs for tetracycline (TC), chlortetracycline (CTC), and oxytetracycline (OTC) were up to 93.0 %, 94.9 %, and 86.5 % and the removal rate of TC was still maintained at about 80 % after four photocatalytic regenerations. In addition, the NMTP ENMs exhibited excellent separation performance and high throughput for oil-in-water emulsions, with separation efficiencies of 98.15 %, 97.43 % and 84.87 % for toluene-in-water, n-heptane-in-water and n-hexane-in-water emulsions. Based on the above results, this study provides a new idea for the development of an efficient and stable simultaneous catalytic separation technology for oil-in-water emulsions.