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

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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引用次数: 0

摘要

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

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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来源期刊
Theoretical and Experimental Chemistry
Theoretical and Experimental Chemistry CHEMISTRY, MULTIDISCIPLINARY-
CiteScore
1.60
自引率
10.00%
发文量
30
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.
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