Breakthrough in Nanotechnology: Novel Magnetic Photocatalyst for Effective Tetracycline Removal

Research from Central South University of Forestry and Technology has led to the development of a novel magnetic photocatalyst that shows promise in removing tetracycline from aquatic environments. The photocatalyst, synthesized by loading FeO and CuWO onto biochar, demonstrates a high specific surface area, enabling efficient capture of tetracycline with an adsorption rate of 81.19% and a Langmuir-derived maximum capacity of 225.28 mg/g at 35°C. This breakthrough has significant implications for sustainable antibiotic removal in wastewater treatment.

Key Takeaways:

• The novel magnetic photocatalyst (MCB) was synthesized by loading FeO and CuWO onto biochar, exhibiting a high specific surface area (117.70 m²/g) and efficient tetracycline capture.
• The adsorption rate of tetracycline was found to be 81.19%, with a Langmuir-derived maximum capacity of 225.28 mg/g at 35°C, indicating strong adsorption performance.
• The incorporation of biochar introduces additional electron transfer-active sites, enhancing charge transport rate and promoting photogenerated charge carrier separation.
• The Z-scheme heterojunction formed between CuWO and FeO effectively promotes charge carrier separation and enhances redox potential, facilitating the production of reactive species.
• Electron spin resonance and scavenger experiments verified h*OH and O* as the dominant oxidative agents, highlighting the environmental safety and practical applicability of 0.6-MCB.
• The research demonstrated significant mineralization performance, with a total tetracycline removal efficiency of 92.83% and a TOC removal rate of 85.57%.
• The photocatalyst maintained 79.45% removal efficiency after five cycles, showcasing good recyclability and structural stability.
• Toxicity analysis revealed significantly reduced toxicity and teratogenicity of tetracycline and its intermediates, underscoring the environmental safety and practical applicability of 0.6-MCB.

Statistics:

• Adsorption rate of tetracycline: 81.19%
• Langmuir-derived maximum capacity: 225.28 mg/g at 35°C
• TOC removal rate: 85.57%
• Total tetracycline removal efficiency: 92.83%
• Recyclability retention rate after five cycles: 79.45%

Sources:

• Synergistic adsorption and photocatalytic degradation of tetracycline by a functionalized Fe3O4/CuWO4/biochar Z-scheme composite. Environmental Research, 2025;285:122299.
• Central South University of Forestry and Technology Reports Findings in Photocatalytics (Synergistic adsorption and photocatalytic degradation of tetracycline by a functionalized Fe3O4/CuWO4/biochar Z-scheme composite). Nanotechnology Weekly. July 21, 2025; p 261.