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<p>A FeWO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> heterojunction photocatalyst was synthesized via a controlled hydrothermal method to improve visible-light-driven removal of antibiotic pollutants. In this system, FeWO<sub>4</sub> nanoparticles were uniformly decorated on Bi<sub>2</sub>WO<sub>6</sub> nanoplates to promote strong interfacial contact and efficient charge separation. The structural and physicochemical properties of the composites were systematically characterized using FESEM, pXRD, HR-TEM, XPS, UV–Vis diffuse reflectance spectroscopy, electrochemical impedance spectroscopy, and photoluminescence analysis, confirming successful heterojunction formation and enhanced interfacial charge-transfer behaviour. The photocatalytic performance was evaluated for the degradation of two widely detected antibiotics, tetracycline (20&#xa0;mg L⁻1) and ciprofloxacin (10&#xa0;mg L⁻1), under natural sunlight irradiation. The optimized 0.10FeWO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> composite exhibited superior activity, achieving 96% degradation of tetracycline with a rate constant of 0.030&#xa0;min⁻1 and 91% degradation of ciprofloxacin with a rate constant of 0.018&#xa0;min⁻1 within 105&#xa0;min. These degradation rates are approximately six and 4.5 times higher, respectively, than those of pristine Bi<sub>2</sub>WO<sub>6</sub> under identical conditions. The enhanced performance is attributed to broadened visible-light absorption, a Z-scheme-like charge-transfer mechanism, suppressed recombination of photogenerated electron–hole pairs, and efficient generation of reactive oxygen species. This study provides a systematic comparative evaluation of two structurally different antibiotics under identical experimental conditions, offering insight into pollutant-dependent degradation kinetics and mechanistic pathways. The results demonstrate that rational interfacial engineering of FeWO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> heterostructures can substantially enhance solar-driven photocatalytic efficiency, underscoring their potential for practical and sustainable wastewater treatment applications.</p> Graphical Abstract <p></p>

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Construction of Z-Scheme FeWO4/Bi2WO6 Heterojunction for Efficient Degradation of Antibiotics in Aqueous Medium

  • 期刊论文

  • 发表日期：

    2026年4月6日

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  • Krishana Kumar Sharma,
  • Ajay Kumar Upadhyay,
  • Abhishek Maurya,
  • Karunamay Majee,
  • Gajendra Kumar

摘要

A FeWO4/Bi2WO6 heterojunction photocatalyst was synthesized via a controlled hydrothermal method to improve visible-light-driven removal of antibiotic pollutants. In this system, FeWO4 nanoparticles were uniformly decorated on Bi2WO6 nanoplates to promote strong interfacial contact and efficient charge separation. The structural and physicochemical properties of the composites were systematically characterized using FESEM, pXRD, HR-TEM, XPS, UV–Vis diffuse reflectance spectroscopy, electrochemical impedance spectroscopy, and photoluminescence analysis, confirming successful heterojunction formation and enhanced interfacial charge-transfer behaviour. The photocatalytic performance was evaluated for the degradation of two widely detected antibiotics, tetracycline (20 mg L⁻1) and ciprofloxacin (10 mg L⁻1), under natural sunlight irradiation. The optimized 0.10FeWO4/Bi2WO6 composite exhibited superior activity, achieving 96% degradation of tetracycline with a rate constant of 0.030 min⁻1 and 91% degradation of ciprofloxacin with a rate constant of 0.018 min⁻1 within 105 min. These degradation rates are approximately six and 4.5 times higher, respectively, than those of pristine Bi2WO6 under identical conditions. The enhanced performance is attributed to broadened visible-light absorption, a Z-scheme-like charge-transfer mechanism, suppressed recombination of photogenerated electron–hole pairs, and efficient generation of reactive oxygen species. This study provides a systematic comparative evaluation of two structurally different antibiotics under identical experimental conditions, offering insight into pollutant-dependent degradation kinetics and mechanistic pathways. The results demonstrate that rational interfacial engineering of FeWO4/Bi2WO6 heterostructures can substantially enhance solar-driven photocatalytic efficiency, underscoring their potential for practical and sustainable wastewater treatment applications.

Graphical Abstract