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<p>In this study, a nZVI/g-C<sub>3</sub>N<sub>4</sub> photocatalyst was successfully prepared, effectively reducing the recombination of photogenerated e<sup>–</sup>-h<sup>+</sup> pairs. Using tetracycline hydrochloride (TC) as the target pollutant, factors such as catalyst ratio, catalyst dosage, and PS concentration were optimized to enhance the TC removal under the illumination of LED lights. The highest removal of TC reached 88.2% at pH 7, and the TOC removal reached 78.2%. Additionally, various operational conditions that may arise in practical applications were investigated, including pH, pollutant concentration, and light intensity. To explore the degradation mechanism of TC, quenching experiments and electron spin resonance (ESR) were employed to detect reactive oxygen species, revealing that •OH and •SO– 4 played a dominant role in removing TC. Density functional theory (DFT) calculations were used to analyze the active sites of TC molecules and the possible degradation pathways of TC molecules during the reaction process were proposed. Ultimately, the theoretical toxicity of the TC molecules after degradation was significantly reduced. This study provides new insights and references for the effective removal of TC by the photocatalytic activation of PS under neutral pH conditions.</p>

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Photocatalytic Activation of Persulfate by nZVI/g-C3N4 for Tetracycline Degradation: Performance and Reaction Mechanism

  • 期刊论文

  • 发表日期：

    2025年12月20日

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  • Hanyu Zhang,
  • Yanzhi Cui,
  • Yongzhen He,
  • Jinqiu Qi,
  • Ruixue Jiang,
  • Ming Li,
  • Xiaochen Li

摘要

In this study, a nZVI/g-C3N4 photocatalyst was successfully prepared, effectively reducing the recombination of photogenerated e–-h+ pairs. Using tetracycline hydrochloride (TC) as the target pollutant, factors such as catalyst ratio, catalyst dosage, and PS concentration were optimized to enhance the TC removal under the illumination of LED lights. The highest removal of TC reached 88.2% at pH 7, and the TOC removal reached 78.2%. Additionally, various operational conditions that may arise in practical applications were investigated, including pH, pollutant concentration, and light intensity. To explore the degradation mechanism of TC, quenching experiments and electron spin resonance (ESR) were employed to detect reactive oxygen species, revealing that •OH and •SO– 4 played a dominant role in removing TC. Density functional theory (DFT) calculations were used to analyze the active sites of TC molecules and the possible degradation pathways of TC molecules during the reaction process were proposed. Ultimately, the theoretical toxicity of the TC molecules after degradation was significantly reduced. This study provides new insights and references for the effective removal of TC by the photocatalytic activation of PS under neutral pH conditions.