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<p>In this paper, direct Z-type BiPO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> heterojunctions were successfully prepared by a two-step solvothermal method using bismuth nitrate, disodium hydrogen phosphate, and sodium tungstate as precursors. The photocatalytic degradation capabilities of the composites for the antibiotic ciprofloxacin (CIP) were examined in circumstances that mimicked sunlight. The composites all showed high adsorption-catalytic properties compared with the monomer materials. Among them, 10&#xa0;wt% BiPO<sub>4</sub>/Bi<sub>2</sub>WO<sub>6</sub> showed the highest degradation rate of 94.51% for CIP (20&#xa0;mg/L) in 2&#xa0;h. The composites were also found to be suitable for the photocatalytic degradation of ciprofloxacin antibiotic. This was attributed to the composite construction of Z-type heterojunction by BiPO<sub>4</sub> and Bi<sub>2</sub>WO<sub>6</sub>, which enhanced its redox capacity and consequently the degradation of CIP. In the meanwhile, XRD, FTIR, XPS, SEM, TEM, EIS, N<sub>2</sub> adsorption–desorption, and UV–vis DRS were used to characterize the composites’ structure and photoelectric characteristics. The synthesized materials had good stability and great purity, according to the results. Furthermore, EPR and free radical trapping tests demonstrated that the primary active ingredients for CIP degradation were h<sup>+</sup> and ·O<sub>2</sub><sup>−</sup>. The final degradation products of CIP were detected by LC–MS, and it was determined that the degradation products were small molecules, and thus their degradation pathways were analyzed.</p>

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BiPO4/Bi2WO6 construction of direct Z-type heterojunction for efficient degradation of ciprofloxacin

  • 期刊论文

  • 发表日期：

    2025年12月19日

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  • Yuanbo Zhang,
  • Cailian Yu,
  • Fen Li,
  • Kuitao Zhao,
  • Yu Wang,
  • Chi Ma,
  • Baoyi Li

摘要

In this paper, direct Z-type BiPO4/Bi2WO6 heterojunctions were successfully prepared by a two-step solvothermal method using bismuth nitrate, disodium hydrogen phosphate, and sodium tungstate as precursors. The photocatalytic degradation capabilities of the composites for the antibiotic ciprofloxacin (CIP) were examined in circumstances that mimicked sunlight. The composites all showed high adsorption-catalytic properties compared with the monomer materials. Among them, 10 wt% BiPO4/Bi2WO6 showed the highest degradation rate of 94.51% for CIP (20 mg/L) in 2 h. The composites were also found to be suitable for the photocatalytic degradation of ciprofloxacin antibiotic. This was attributed to the composite construction of Z-type heterojunction by BiPO4 and Bi2WO6, which enhanced its redox capacity and consequently the degradation of CIP. In the meanwhile, XRD, FTIR, XPS, SEM, TEM, EIS, N2 adsorption–desorption, and UV–vis DRS were used to characterize the composites’ structure and photoelectric characteristics. The synthesized materials had good stability and great purity, according to the results. Furthermore, EPR and free radical trapping tests demonstrated that the primary active ingredients for CIP degradation were h+ and ·O2−. The final degradation products of CIP were detected by LC–MS, and it was determined that the degradation products were small molecules, and thus their degradation pathways were analyzed.