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<p>Due to the increasing deterioration of the aqueous environment caused by various organic dyes, the development of highly efficient novel photocatalysts has become urgent. This study designed a novel UV/layered double oxides (LDO)/thiourea dioxide (TD) system based on UV-assisted advanced reduction processes to achieve efficient and cost-effective degradation of methyl orange (MO). The experimental results exhibited that 99.7% of 50&#xa0;mg/L MO was completely degraded in UV/LDO/TD within 20&#xa0;min at 25&#xa0;°C and pH 10. During the decomposition of TD, highly reductive e<sub>aq</sub><sup>−</sup>, SO<sub>2</sub><sup>2−</sup> and H· were generated, and in the presence of dissolved oxygen simultaneously produced oxidizing species such as O<sub>2</sub><sup>·−</sup>, OH·, and <sup>1</sup>O<sub>2</sub>. Oxygen vacancies of LDO not only activated TD but also acted as an electron shuttle to transfer electrons from TD to MO. Non-radical degradation pathways, including <sup>1</sup>O<sub>2</sub> and electron transfer process, dominated the degradation of MO. The degradation efficiency of MO remained at 93.2% after 5 cycles, demonstrating the excellent reusability of LDO in the UV/LDO/TD system. This study provided new insights into LDO-activated TD under UV irradiation for environmental remediation. It highlighted the commercial potential of the UV/LDO/TD system for sustainable, scalable removal of organic dyes from industrial wastewater.</p>

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Oxygen vacancies mediated electrons transfer for the degradation of organic pollutants in UV/layered double oxides/thiourea dioxide

  • 期刊论文

  • 发表日期：

    2025年4月20日

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  • Mengxia Dai,
  • Chaoyang Wang,
  • Yashan Wang,
  • Ran Zhang,
  • Feifei Chen

摘要

Due to the increasing deterioration of the aqueous environment caused by various organic dyes, the development of highly efficient novel photocatalysts has become urgent. This study designed a novel UV/layered double oxides (LDO)/thiourea dioxide (TD) system based on UV-assisted advanced reduction processes to achieve efficient and cost-effective degradation of methyl orange (MO). The experimental results exhibited that 99.7% of 50 mg/L MO was completely degraded in UV/LDO/TD within 20 min at 25 °C and pH 10. During the decomposition of TD, highly reductive eaq−, SO22− and H· were generated, and in the presence of dissolved oxygen simultaneously produced oxidizing species such as O2·−, OH·, and 1O2. Oxygen vacancies of LDO not only activated TD but also acted as an electron shuttle to transfer electrons from TD to MO. Non-radical degradation pathways, including 1O2 and electron transfer process, dominated the degradation of MO. The degradation efficiency of MO remained at 93.2% after 5 cycles, demonstrating the excellent reusability of LDO in the UV/LDO/TD system. This study provided new insights into LDO-activated TD under UV irradiation for environmental remediation. It highlighted the commercial potential of the UV/LDO/TD system for sustainable, scalable removal of organic dyes from industrial wastewater.