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<p>Rapid industrial development has exacerbated pollution, particularly heavy metal Cr(VI). In this study, mulberry-like BiVO<sub>4</sub> was prepared via a hydrothermal method, and BiVO<sub>4</sub>/Bi<sub>2</sub>S<sub>3</sub> heterojunctions were prepared by an in-situ solvothermal method. By controlling the sulfurization time (3, 6, 9, 12&#xa0;h), the structure, morphology and properties of the heterojunctions were systematically investigated using techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV–vis DRS). The photocatalytic reduction of Cr(VI) was performed to evaluate catalytic performance. The sample sulfurized for 6&#xa0;h (6BVBS) exhibited reduced bandgap of 1.83&#xa0;eV and significantly enhanced visible light absorption. It demonstrated remarkable photocatalytic performance, achieving reduction efficiency of 80% for Cr(VI) (30&#xa0;mg/L) within 100&#xa0;min. Its reduction efficiency was 4.3 times than that of BiVO<sub>4</sub>. Combined with Density Functional Theory (DFT) study, a possible Z-scheme charge transfer pathway was revealed. This work provides a novel photocatalytic material and technical approach for reducing high-concentration Cr(VI).</p>

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In-situ constructed of mulberry-like BiVO4/Bi2S3 heterojunction for enhanced photocatalytic Cr(VI) reduction: experimental and DFT study

  • 期刊论文

  • 发表日期：

    2026年2月25日

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  • Pengyu Zhang,
  • Huanhuan Lu,
  • Jinping Zhang,
  • Yuan Cheng,
  • Hongwei Wang,
  • Xinli Li

摘要

Rapid industrial development has exacerbated pollution, particularly heavy metal Cr(VI). In this study, mulberry-like BiVO4 was prepared via a hydrothermal method, and BiVO4/Bi2S3 heterojunctions were prepared by an in-situ solvothermal method. By controlling the sulfurization time (3, 6, 9, 12 h), the structure, morphology and properties of the heterojunctions were systematically investigated using techniques such as X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and Ultraviolet–Visible Diffuse Reflectance Spectroscopy (UV–vis DRS). The photocatalytic reduction of Cr(VI) was performed to evaluate catalytic performance. The sample sulfurized for 6 h (6BVBS) exhibited reduced bandgap of 1.83 eV and significantly enhanced visible light absorption. It demonstrated remarkable photocatalytic performance, achieving reduction efficiency of 80% for Cr(VI) (30 mg/L) within 100 min. Its reduction efficiency was 4.3 times than that of BiVO4. Combined with Density Functional Theory (DFT) study, a possible Z-scheme charge transfer pathway was revealed. This work provides a novel photocatalytic material and technical approach for reducing high-concentration Cr(VI).