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<p>To explore high value-added utilization pathways of fly ash, the mesoporous structure of silicon dioxide extracted from fly ash (FA-SiO<sub>2</sub>) was utilized to restrict the dicyandiamide (DCDA) thermal degradation process. This produced chemically bonded interacting composite photocatalysts of FA-SiO<sub>2</sub> and graphitic-phase carbon nitride (g-C<sub>3</sub>N<sub>4</sub>). Compared with the spherical silicon dioxide prepared using tetraethyl orthosilicate (TEOS-SiO<sub>2</sub>), the mesoporous structure of FA-SiO<sub>2</sub> allowed DCDA to react in a smaller space, which facilitated the transformation of DCDA to melamine by the thermal degradation kinetics of FA-SiO<sub>2</sub>/DCDA. This ultimately boosted the formation of an N-atom-removed triazine ring structure and a multistage structure combining lumps and rods in the composite photocatalysts of g-C<sub>3</sub>N<sub>4</sub> and FA-SiO<sub>2</sub>, which led to a higher visible-light utilization efficiency, a suitable valence-band position, and the photocatalytic activity for methylene blue reaching 3.56 times that of g-C<sub>3</sub>N<sub>4</sub>. The findings indicate that mesoporous FA-SiO<sub>2</sub> has the potential to improve the structural and photocatalytic properties of g-C<sub>3</sub>N<sub>4</sub>-based materials.</p>

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Effect of mesoporous FA-SiO2 extracted from fly ash on the structural and photocatalytic properties of g-C3N4-based materials

  • 期刊论文

  • 发表日期：

    2025年6月27日

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  • Xianhua Li,
  • Qingbo Yu

摘要

To explore high value-added utilization pathways of fly ash, the mesoporous structure of silicon dioxide extracted from fly ash (FA-SiO2) was utilized to restrict the dicyandiamide (DCDA) thermal degradation process. This produced chemically bonded interacting composite photocatalysts of FA-SiO2 and graphitic-phase carbon nitride (g-C3N4). Compared with the spherical silicon dioxide prepared using tetraethyl orthosilicate (TEOS-SiO2), the mesoporous structure of FA-SiO2 allowed DCDA to react in a smaller space, which facilitated the transformation of DCDA to melamine by the thermal degradation kinetics of FA-SiO2/DCDA. This ultimately boosted the formation of an N-atom-removed triazine ring structure and a multistage structure combining lumps and rods in the composite photocatalysts of g-C3N4 and FA-SiO2, which led to a higher visible-light utilization efficiency, a suitable valence-band position, and the photocatalytic activity for methylene blue reaching 3.56 times that of g-C3N4. The findings indicate that mesoporous FA-SiO2 has the potential to improve the structural and photocatalytic properties of g-C3N4-based materials.