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<p>Designing a suitable photocatalytic heterojunction with low degree of photocarriers recombination and high visible light sensitivity is an effective approach to enhance the photocatalytic activity towards rapid and efficient pollutant degradation. Herein, we fabricated Bi<sub>2</sub>S<sub>3</sub> (BS) nanoflowers over Bi-doped g-C<sub>3</sub>N<sub>4</sub> (BCN) in different percentages (BS percentages were from 20wt% to 60wt%) to obtain an optimum composite heterojunction for visible-light-prompted degradation of selected fluoroquinolone antibiotic (lomefloxacin (LFX)). Noticeably, 40wt%-BS/BCN hybrid achieved superb photocatalytic performance (97.7% LFX degradation within 60&#xa0;min), achieving degradation rate nearly 4 and 7 times higher than that of BCN and BS, respectively. The advanced visible-light absorption properties of g-C<sub>3</sub>N<sub>4</sub> due to the Bi doping and the high separation rate of photo-prompted e<sup>−</sup>/h<sup>+</sup> pairs at the heterojunction interface of type-II were the main reasons for the this achievement. The trapping studies showed that mainly <sup>•</sup>O<sub>2</sub><sup>−</sup> and secondary h<sup>+</sup> were the key species in the LFX decomposition. According to the stability analysis, the degradation efficiency of 93.4% was still obtained after five rounds (i.e. ≤ 4% reduction), signifying the strength of constructed BS/BCN heterojunction. The present work presents a noteworthy insight and explanations for photocatalytically decomposing antibiotics in wastewater.</p> Graphical Abstract <p></p>

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Exploring the Photocatalytic Efficiency of Bi-Doped g-C3N4 Decorated with Bi2S3 Nanoflowers as Efficient and Recyclable Heterojunctions

  • 期刊论文

  • 发表日期：

    2026年6月23日

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  • Fatima D. Ali,
  • Saad H. Ammar,
  • Nada D. Ali,
  • Ruaa F. Shafi,
  • Hanan H. Abed

摘要

Designing a suitable photocatalytic heterojunction with low degree of photocarriers recombination and high visible light sensitivity is an effective approach to enhance the photocatalytic activity towards rapid and efficient pollutant degradation. Herein, we fabricated Bi2S3 (BS) nanoflowers over Bi-doped g-C3N4 (BCN) in different percentages (BS percentages were from 20wt% to 60wt%) to obtain an optimum composite heterojunction for visible-light-prompted degradation of selected fluoroquinolone antibiotic (lomefloxacin (LFX)). Noticeably, 40wt%-BS/BCN hybrid achieved superb photocatalytic performance (97.7% LFX degradation within 60 min), achieving degradation rate nearly 4 and 7 times higher than that of BCN and BS, respectively. The advanced visible-light absorption properties of g-C3N4 due to the Bi doping and the high separation rate of photo-prompted e−/h+ pairs at the heterojunction interface of type-II were the main reasons for the this achievement. The trapping studies showed that mainly •O2− and secondary h+ were the key species in the LFX decomposition. According to the stability analysis, the degradation efficiency of 93.4% was still obtained after five rounds (i.e. ≤ 4% reduction), signifying the strength of constructed BS/BCN heterojunction. The present work presents a noteworthy insight and explanations for photocatalytically decomposing antibiotics in wastewater.

Graphical Abstract