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<p>Layered double hydroxides (LDHs) present advantages in photocatalytic degradation of organic pollutants due to excellent adsorption capacity, special layered structure, robust responsiveness to ultraviolet and visible light, and so on. In order to improve the utilization efficiency of photo-generated charges, in this work, we combined basic bismuth nitrates (BBN) with CuCr-Cl-LDH to fabricate a heterojunction composite. The target heterojunction was synthesized by hydrothermal method and characterized by techniques such as XRD, XPS, SEM, TEM, UV–vis DRS, BET and electrochemical performance test. The results showed that the combination of BBN and CuCr-Cl-LDH formed the S-scheme heterojunction, promoting the separation of electrons and holes and remarkably improving the photocatalytic activity of CuCr-Cl-LDH. The composite that prepared by combination of 7.95&#xa0;g of Bi (NO<sub>3</sub>)<sub>3</sub>·5H<sub>2</sub>O with 1&#xa0;g of CuCr-Cl-LDH presented the optimal photocatalytic degradation efficiency of 96% after 2&#xa0;h irradiation by visible-light at condition as photocatalyst dosage of 0.5&#xa0;g&#xa0;L<sup>–1</sup> and initial tetracycline (TC) concentration of 20&#xa0;mg&#xa0;L<sup>–1</sup>. During the photocatalytic degradation process, the main active radicals were h<sup>+</sup>, followed by •O<sub>2</sub><sup>–</sup>, and •OH took a relative weak role. After use of 3 cycles, the heterojunction remained the photocatalytic efficiency of 82%, showing a preliminary feasibility to application in wastewater treatment.</p> Graphical abstract <p></p>

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Construction of the heterojunction with basic bismuth nitrates and CuCr-Cl-LDH for enhanced photocatalytic degradation of tetracycline under visible-light

  • 期刊论文

  • 发表日期：

    2025年5月19日

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  • Yinyan Dou,
  • Yanming Shen,
  • Junhua Wen,
  • Lei Yang

摘要

Layered double hydroxides (LDHs) present advantages in photocatalytic degradation of organic pollutants due to excellent adsorption capacity, special layered structure, robust responsiveness to ultraviolet and visible light, and so on. In order to improve the utilization efficiency of photo-generated charges, in this work, we combined basic bismuth nitrates (BBN) with CuCr-Cl-LDH to fabricate a heterojunction composite. The target heterojunction was synthesized by hydrothermal method and characterized by techniques such as XRD, XPS, SEM, TEM, UV–vis DRS, BET and electrochemical performance test. The results showed that the combination of BBN and CuCr-Cl-LDH formed the S-scheme heterojunction, promoting the separation of electrons and holes and remarkably improving the photocatalytic activity of CuCr-Cl-LDH. The composite that prepared by combination of 7.95 g of Bi (NO3)3·5H2O with 1 g of CuCr-Cl-LDH presented the optimal photocatalytic degradation efficiency of 96% after 2 h irradiation by visible-light at condition as photocatalyst dosage of 0.5 g L–1 and initial tetracycline (TC) concentration of 20 mg L–1. During the photocatalytic degradation process, the main active radicals were h+, followed by •O2–, and •OH took a relative weak role. After use of 3 cycles, the heterojunction remained the photocatalytic efficiency of 82%, showing a preliminary feasibility to application in wastewater treatment.

Graphical abstract