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<p>As a traditional photocatalyst, UV-responsive TiO<sub>2</sub> has been widely favored, but its light energy utilization is lower than that of g-C<sub>3</sub>N<sub>4</sub> with a visible light response. However, the photogenerated carriers of g-C<sub>3</sub>N<sub>4</sub> have a low separation efficiency. In this study, SiO<sub>2</sub> was utilized as a carrier to compound with TiO<sub>2</sub> and g-C<sub>3</sub>N<sub>4</sub> to ameliorate these flaws and advance their photocatalytic function. FT-IR, SEM, AFM, UV–Vis DRS, and PL were used to examine the optical performance, surface structure, and appearance of the composites. Taking the compounding ratio of SiO<sub>2</sub> and photocatalysts as a variable, NO purification rate as the evaluation index of photocatalyst pollution purification effect, and water and oil contact angle as the evaluation index of hydrophobicity and oleophobicity of photocatalytic coatings, the photocatalysts of SiO<sub>2</sub>:TiO<sub>2</sub> = 3:1 and SiO<sub>2</sub>:g-C<sub>3</sub>N<sub>4</sub> = 5:1 were discovered to have the best photocatalytic effect among the same series of materials, with the latter having the greatest impact.&#xa0;The coatings of SiO<sub>2</sub>:TiO<sub>2</sub> = 5:1 and SiO<sub>2</sub>:g-C<sub>3</sub>N<sub>4</sub> = 5:1 combined with PDMS exhibited the best hydrophobicity and oleophobicity of the same series of coatings, with the latter having the greatest effect. By varying the PDMS percentage in the SiO<sub>2</sub>:g-C<sub>3</sub>N<sub>4</sub> = 5:1/PDMS coatings, the optimal SCN5-1/P coating with 75% PDMS content was finally obtained, which had NO purification rate of 38.43%, and water and oil contact angles of 131.86° and 135.16°. This work provides a preparation method for producing high-efficiency photocatalytic self-cleaning coatings, which will aid in the advancement of photocatalytic self-cleaning technology.</p>

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An innovative g-C3N4/SiO2/PDMS composite coating with photocatalytic NO purification and self-cleaning functions

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Siyu Wu,
  • Xiaoyu Yang,
  • Xuejuan Cao,
  • Xiangyu Wang,
  • Mingxuan Huang,
  • Lei Deng

摘要

As a traditional photocatalyst, UV-responsive TiO2 has been widely favored, but its light energy utilization is lower than that of g-C3N4 with a visible light response. However, the photogenerated carriers of g-C3N4 have a low separation efficiency. In this study, SiO2 was utilized as a carrier to compound with TiO2 and g-C3N4 to ameliorate these flaws and advance their photocatalytic function. FT-IR, SEM, AFM, UV–Vis DRS, and PL were used to examine the optical performance, surface structure, and appearance of the composites. Taking the compounding ratio of SiO2 and photocatalysts as a variable, NO purification rate as the evaluation index of photocatalyst pollution purification effect, and water and oil contact angle as the evaluation index of hydrophobicity and oleophobicity of photocatalytic coatings, the photocatalysts of SiO2:TiO2 = 3:1 and SiO2:g-C3N4 = 5:1 were discovered to have the best photocatalytic effect among the same series of materials, with the latter having the greatest impact. The coatings of SiO2:TiO2 = 5:1 and SiO2:g-C3N4 = 5:1 combined with PDMS exhibited the best hydrophobicity and oleophobicity of the same series of coatings, with the latter having the greatest effect. By varying the PDMS percentage in the SiO2:g-C3N4 = 5:1/PDMS coatings, the optimal SCN5-1/P coating with 75% PDMS content was finally obtained, which had NO purification rate of 38.43%, and water and oil contact angles of 131.86° and 135.16°. This work provides a preparation method for producing high-efficiency photocatalytic self-cleaning coatings, which will aid in the advancement of photocatalytic self-cleaning technology.