High Efficiency Removal Performance of Tetracycline by Magnetic CoFe 2 O 4 /NaBiO 3 Photocatalytic Synergistic Persulfate Technology

• Published in: Molecules (Basel, Switzerland) Vol. 29; no. 17
• Main Authors: Zhang, Juanxiang, Zhang, Shengnan, Bian, Xiuqi, Yin, Yaoshan, Huang, Weixiong, Liu, Chong, Liang, Xinqiang, Li, Fayong
• Format: Journal Article
• Language: English
• Published: Switzerland 27.08.2024
• Subjects: Anti-Bacterial Agents - chemistry; Catalysis; Cobalt - chemistry; Ferric Compounds - chemistry; Light; Oxidation-Reduction; Peroxides; Photolysis; Sodium Compounds; Sulfates - chemistry; Tetracycline - chemistry; Wastewater - chemistry; Water Pollutants, Chemical - chemistry; Water Purification - methods; bismuth nitrate; peroxymonosulfate; property; cobalt ferrite; photocatalysis; antibiotics
• ISSN: 1420-3049

The widespread environmental contamination resulting from the misuse of tetracycline antibiotics (TCs) has garnered significant attention and study by scholars. Photocatalytic technology is one of the environmentally friendly advanced oxidation processes (AOPs) that can effectively solve the problem of residue of TCs in the water environment. This study involved the synthesis of the heterogeneous magnetic photocatalytic material of CoFe O /NaBiO via the solvothermal method, and it was characterized using different characterization techniques. Then, the photocatalytic system under visible light (Vis) was coupled with peroxymonosulfate (PMS) to explore the performance and mechanism of degradation of tetracycline hydrochloride (TCH) in the wastewater. The characterization results revealed that CoFe O /NaBiO effectively alleviated the agglomeration phenomenon of CoFe O particles, increased the specific surface area, effectively narrowed the band gap, expanded the visible light absorption spectrum, and inhibited recombination of photogenerated electron-hole pairs. In the Vis+CoFe O /NaBiO +PMS system, CoFe O /NaBiO effectively activated PMS to produce hydroxyl radicals (·OH) and sulfate radicals (SO ). Under the conditions of a TCH concentration of 10 mg/L , a catalyst concentration of 1 g/L and a PMS concentration of 100 mg/L , the degradation efficiency of TCH reached 94% after 100 min illumination. The degradation of TCH was enhanced with the increase in the CoFe O /NaBiO and PMS dosage. The solution pH and organic matter had a significant impact on TCH degradation. Notably, the TCH degradation efficiency decreased inversely with increasing values of these parameters. The quenching experiments indicated that the free radicals contributing to the Vis+CoFe O /NaBiO +PMS system were ·OH followed by SO , hole (h ), and the superoxide radical (O ). The main mechanism of PMS was based on the cycle of Co and Co , as well as Fe and Fe . The cyclic tests and characterization by XRD and FT-IR revealed that CoFe O /NaBiO had good degradation stability. The experimental findings can serve as a reference for the complete removal of antibiotics from wastewater.