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<p>Carbon nitride is a good inorganic non-metallic material, and is widely used in the photocatalysis. However, its photocatalytic performance is significantly related to its morphological characteristics, especially its nanosheet-like morphology has recently attracted keen interest. In this paper, a soluble salt-assisted route is adopted. By ball milling melamine and Na<sub>2</sub>SO<sub>4</sub> powder, the precursor can be evenly distributed over the surface of Na<sub>2</sub>SO<sub>4</sub> particulates. Then through the thermal decomposition reaction, and finally by washing Na<sub>2</sub>SO<sub>4</sub> with water, a large amount of carbon nitride nanosheet powders can be obtained. After the examinations by XRD, SEM, XPS, PL, and BET, the results show that the product has a hexagonal phase C<sub>3</sub>N<sub>4</sub> structure, sheet-like morphology with two-dimensional sizes of several micrometers and a thickness of ten nanometers, a large surface area of 23.89 m<sup>2</sup>/g and a low PL intensity centered at 450&#xa0;nm when compared with the bulk C<sub>3</sub>N<sub>4</sub> powders, well known for enhancing its photocatalytic efficiency. According to expectation, the dye photocatalytic degradation rate over the C<sub>3</sub>N<sub>4</sub> nanosheets is 90% in 30&#xa0;min, but only 60% in the same time on bulk C<sub>3</sub>N<sub>4</sub>. Moreover the photocatalytic degradation reactions follow pseudo-first-order reaction kinetics, and the former rate constant is more than twice that the latter.</p> Graphical abstract <p></p>

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Synthesis of large surface area C3N4 nanosheets by the soluble salt-assisted route, and their good photocatalytic degradation of dye

  • 期刊论文

  • 发表日期：

    2025年1月17日

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  • Yingying Lv,
  • Ping Huang,
  • Tingting Ming,
  • Liusai Yang,
  • Leshu Yu

摘要

Carbon nitride is a good inorganic non-metallic material, and is widely used in the photocatalysis. However, its photocatalytic performance is significantly related to its morphological characteristics, especially its nanosheet-like morphology has recently attracted keen interest. In this paper, a soluble salt-assisted route is adopted. By ball milling melamine and Na2SO4 powder, the precursor can be evenly distributed over the surface of Na2SO4 particulates. Then through the thermal decomposition reaction, and finally by washing Na2SO4 with water, a large amount of carbon nitride nanosheet powders can be obtained. After the examinations by XRD, SEM, XPS, PL, and BET, the results show that the product has a hexagonal phase C3N4 structure, sheet-like morphology with two-dimensional sizes of several micrometers and a thickness of ten nanometers, a large surface area of 23.89 m2/g and a low PL intensity centered at 450 nm when compared with the bulk C3N4 powders, well known for enhancing its photocatalytic efficiency. According to expectation, the dye photocatalytic degradation rate over the C3N4 nanosheets is 90% in 30 min, but only 60% in the same time on bulk C3N4. Moreover the photocatalytic degradation reactions follow pseudo-first-order reaction kinetics, and the former rate constant is more than twice that the latter.

Graphical abstract