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<p>Fly ash, as the primary solid waste discharged from coal-fired power plants, has seen its annual production continuously rise while its comprehensive utilization rate remains low. Achieving its high-value utilization has become a current research hotspot in academia. Given fly ash’s excellent adsorption properties, using it as a raw material to prepare low-cost zeolite molecular sieves is one of the important pathways for its high-value utilization. TiO<sub>2</sub>, as a commonly used photocatalyst, suffers from drawbacks such as poor dispersibility and difficulty in recovery due to its fine particle size and light weight. Loading TiO<sub>2</sub> onto fly ash-based zeolite can effectively address these issues. This study synthesized an X zeolite-TiO<sub>2</sub> composite catalyst from fly ash using a one-step hydrothermal method. The photocatalytic degradation performance of methylene blue simulated wastewater was tested and calculated using visible spectrophotometry. The results showed that for a simulated wastewater with an initial methylene blue concentration of 30&#xa0;mg/L, when the catalyst dosage was 0.36&#xa0;g/L, dark adsorption lasted 30&#xa0;min, photocatalytic reaction proceeded for 100&#xa0;min, and ultrasonic dispersion was applied for 30&#xa0;min, the methylene blue removal rate reached 98.36%.</p>

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Fly Ash-based X Zeolite-TiO2 Composite Catalysts in Photocatalytic Performance

  • 期刊论文

  • 发表日期：

    2025年8月25日

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  • Haiyue Xue,
  • Guozhi Lv,
  • Ting-an Zhang

摘要

Fly ash, as the primary solid waste discharged from coal-fired power plants, has seen its annual production continuously rise while its comprehensive utilization rate remains low. Achieving its high-value utilization has become a current research hotspot in academia. Given fly ash’s excellent adsorption properties, using it as a raw material to prepare low-cost zeolite molecular sieves is one of the important pathways for its high-value utilization. TiO2, as a commonly used photocatalyst, suffers from drawbacks such as poor dispersibility and difficulty in recovery due to its fine particle size and light weight. Loading TiO2 onto fly ash-based zeolite can effectively address these issues. This study synthesized an X zeolite-TiO2 composite catalyst from fly ash using a one-step hydrothermal method. The photocatalytic degradation performance of methylene blue simulated wastewater was tested and calculated using visible spectrophotometry. The results showed that for a simulated wastewater with an initial methylene blue concentration of 30 mg/L, when the catalyst dosage was 0.36 g/L, dark adsorption lasted 30 min, photocatalytic reaction proceeded for 100 min, and ultrasonic dispersion was applied for 30 min, the methylene blue removal rate reached 98.36%.