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<p>The combination of photocatalyst and biochar can play a synergistic role in the process of photocatalysis. In this study, using agricultural waste peanut shell as biochar precursor, peanut shell biochar-supported Ag<sub>3</sub>PO<sub>4</sub>/ZnO catalyst (BC/Ag<sub>3</sub>PO<sub>4</sub>/ZnO) was constructed for synergistic adsorption and photodegradation of Congo red (CR). Results displayed that the CR removal rate by BC/Ag<sub>3</sub>PO<sub>4</sub>/ZnO reached 99.1% after 30&#xa0;min of adsorption and 80&#xa0;min of irradiation. The apparent rate constant was 0.0312&#xa0;min<sup>−1</sup>, which is 14.18, 9.45, and 3.47 times higher than that of Ag<sub>3</sub>PO<sub>4</sub>, ZnO, and Ag<sub>3</sub>PO<sub>4</sub>/ZnO, respectively. It is suggested that the synergistic effect of adsorption of biochar and photocatalytic activity of Ag<sub>3</sub>PO<sub>4</sub>/ZnO leads to high degradation efficiency. Moreover, ⋅O<sub>2</sub><sup>−</sup> and⋅OH are the main active groups for CR degradation by BC/Ag<sub>3</sub>PO<sub>4</sub>/ZnO, and a possible photodegradation mechanism combined with photoelectric properties is proposed. Due to its excellent photocatalytic activity and excellent stability, BC/Ag<sub>3</sub>PO<sub>4</sub>/ZnO has become an economical, rapid, and efficient composite for the removal of dye. It can be inferred that the introduction of biochar and the construction of heterojunction reduce the band gap energy of BC/Ag<sub>3</sub>PO<sub>4</sub>/ZnO composites, accelerate the separation and migration of photogenerated carriers, and effectively inhibit the recombination of photogenerated electron holes.</p>

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Fabrication of peanut shell biochar-supported Ag3PO4/ZnO for the enhanced photodegradation activity of Congo red: performance and mechanism

  • 期刊论文

  • 发表日期：

    2025年12月29日

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  • Xiao-fang Li,
  • Jing Yan,
  • Xiao-qiang Feng

摘要

The combination of photocatalyst and biochar can play a synergistic role in the process of photocatalysis. In this study, using agricultural waste peanut shell as biochar precursor, peanut shell biochar-supported Ag3PO4/ZnO catalyst (BC/Ag3PO4/ZnO) was constructed for synergistic adsorption and photodegradation of Congo red (CR). Results displayed that the CR removal rate by BC/Ag3PO4/ZnO reached 99.1% after 30 min of adsorption and 80 min of irradiation. The apparent rate constant was 0.0312 min−1, which is 14.18, 9.45, and 3.47 times higher than that of Ag3PO4, ZnO, and Ag3PO4/ZnO, respectively. It is suggested that the synergistic effect of adsorption of biochar and photocatalytic activity of Ag3PO4/ZnO leads to high degradation efficiency. Moreover, ⋅O2− and⋅OH are the main active groups for CR degradation by BC/Ag3PO4/ZnO, and a possible photodegradation mechanism combined with photoelectric properties is proposed. Due to its excellent photocatalytic activity and excellent stability, BC/Ag3PO4/ZnO has become an economical, rapid, and efficient composite for the removal of dye. It can be inferred that the introduction of biochar and the construction of heterojunction reduce the band gap energy of BC/Ag3PO4/ZnO composites, accelerate the separation and migration of photogenerated carriers, and effectively inhibit the recombination of photogenerated electron holes.