Influence of Sulfur Doping of Crystalline Carbon Nitride on Photocatalytic Hydrogen Evolution from Alcohol–Aqueous Solutions Under Visible Light

IF 0.7 4区化学 Q4 CHEMISTRY, MULTIDISCIPLINARY

Theoretical and Experimental Chemistry Pub Date : 2024-06-03 DOI:10.1007/s11237-024-09798-5

M. L. Ovcharov, P. I. Glukhova, G. V. Korzhak, O. S. Kutsenko, T. R. Stara, S. Ya. Kuchmiy

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Abstract

The influence of sulfur on the morphology, spectral, and photocatalytic properties of bulk (S-g-C₃N₄) and crystalline carbon nitride (S-CGCN), obtained by the pyrolysis of melamine–S₈ mixtures and additional thermal treatment of S-g-C₃N₄ in the eutectic melt of KCl and LiCl salts, has been investigated. It is shown that crystalline carbon nitride obtained in the presence of 5 wt.% of S₈ (5S-CGCN) demonstrate the highest photocatalytic activity in the hydrogen evolution process from water–ethanol solutions under the effect of visible light. The effective quantum yield of H₂ formation with the participation of 5S-CGCN and metal co-catalysts (palladium and gold) is Φ ≈ 100% at λ = 405 nm, which is almost twice as much as with the participation of unmodified CGCN. The high activity of 5S-CGCN can be associated with more intensive absorption of light, better separation of photogenerated charges, and suppression of their recombination.

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氮化碳晶体掺硫对可见光下酒精水溶液光催化氢气生成的影响

通过热解三聚氰胺-S8 混合物以及在氯化钾和氯化锂盐的共晶熔体中对 S-g-C3N4 进行附加热处理，研究了硫对块状氮化碳（S-g-C3N4）和结晶氮化碳（S-CGCN）的形态、光谱和光催化特性的影响。结果表明，在可见光作用下，从水-乙醇溶液中获得的晶体氮化碳（5S-CGCN）在氢气进化过程中表现出最高的光催化活性。在 λ = 405 纳米波长下，5S-CGCN 和金属助催化剂（钯和金）参与生成氢气的有效量子产率为 Φ ≈ 100%，几乎是未改性 CGCN 参与生成氢气量子产率的两倍。5S-CGCN 的高活性可能与它对光的吸收更强、光生电荷分离得更好以及抑制了它们的重组有关。

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来源期刊

Theoretical and Experimental Chemistry CHEMISTRY, MULTIDISCIPLINARY-

CiteScore

1.60

自引率

10.00%

发文量

审稿时长

6-12 weeks

期刊介绍： Theoretical and Experimental Chemistry is a journal for the rapid publication of research communications and reviews on modern problems of physical chemistry such as: a) physicochemical bases, principles, and methods for creation of novel processes, compounds, and materials; b) physicochemical principles of chemical process control, influence of external physical forces on chemical reactions; c) physical nanochemistry, nanostructures and nanomaterials, functional nanomaterials, size-dependent properties of materials.