The ternary composite catalyst Bi2O2CO3/g-C3N4/Bi2O3 (CN/BCO) demonstrates superior performance in photocatalysis, but its preparation is relatively complex. This study employs a one-step thermal polymerization method using dicyandiamide and bismuth nitrate pentahydrate as raw materials to synthesize the Bi2O2CO3/g-C3N4/Bi2O3 (CN/BCO) composite nanomaterial. Characterization techniques including scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to examine its morphology and performance. Additionally, the effects of catalyst composite ratio and initial reaction solution pH on photocatalytic efficiency were investigated. Multiple experiments demonstrated optimal performance at a bismuth cyanate/dicyandiamide doping ratio of 1:15%. The composite was synthesized by heating the ground mixture in a muffle furnace at 550 °C for four hours. After 90 min of photoreaction (400-W ultraviolet lamp), the degradation efficiency of ciprofloxacin (CIP) reached 81.2%. Quenching experiments revealed that <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$\cdot {\text{O}}_{2}^{ - }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>·</mo> <msubsup> <mtext>O</mtext> <mrow> <mn>2</mn> </mrow> <mo>-</mo> </msubsup> </mrow> </math></EquationSource> </InlineEquation>, ·h⁺, and ·OH radicals all contribute to the photocatalytic reaction, with <InlineEquation ID="IEq2"> <EquationSource Format="TEX">$\cdot {\text{O}}_{2}^{ - }$</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo>·</mo> <msubsup> <mtext>O</mtext> <mrow> <mn>2</mn> </mrow> <mo>-</mo> </msubsup> </mrow> </math></EquationSource> </InlineEquation> playing the most significant role. Thus, the composite catalyst developed in this study, due to its ease of preparation and high efficiency in degrading CIP, represents a promising material for wastewater treatment.

Study on the degradation of CIP by Bi₂O₂CO₃/g-C₃N₃/Bi₂O₃ composites prepared by one-step method

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发表日期：

2026年1月6日

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Qingkang Zhang,
Xian Liu,
Yu Pan,
Yongfeng He,
Lei Zhu,
Xun Wang

摘要

The ternary composite catalyst Bi₂O₂CO₃/g-C₃N₄/Bi₂O₃ (CN/BCO) demonstrates superior performance in photocatalysis, but its preparation is relatively complex. This study employs a one-step thermal polymerization method using dicyandiamide and bismuth nitrate pentahydrate as raw materials to synthesize the Bi₂O₂CO₃/g-C₃N₄/Bi₂O₃ (CN/BCO) composite nanomaterial. Characterization techniques including scanning electron microscopy (SEM) and X-ray diffraction (XRD) were employed to examine its morphology and performance. Additionally, the effects of catalyst composite ratio and initial reaction solution pH on photocatalytic efficiency were investigated. Multiple experiments demonstrated optimal performance at a bismuth cyanate/dicyandiamide doping ratio of 1:15%. The composite was synthesized by heating the ground mixture in a muffle furnace at 550 °C for four hours. After 90 min of photoreaction (400-W ultraviolet lamp), the degradation efficiency of ciprofloxacin (CIP) reached 81.2%. Quenching experiments revealed that $\cdot {\text{O}}_{2}^{ - }$ $\cdot O_{2}^{-}$ , ·h⁺, and ·OH radicals all contribute to the photocatalytic reaction, with $\cdot {\text{O}}_{2}^{ - }$ $\cdot O_{2}^{-}$ playing the most significant role. Thus, the composite catalyst developed in this study, due to its ease of preparation and high efficiency in degrading CIP, represents a promising material for wastewater treatment.

Study on the degradation of CIP by Bi2O2CO3/g-C3N3/Bi2O3 composites prepared by one-step method

摘要

Study on the degradation of CIP by Bi₂O₂CO₃/g-C₃N₃/Bi₂O₃ composites prepared by one-step method