Photocatalytic evolution of H2 from aqueous solutions of two-component electron-donor substrates in the presence of g-C3N4 activated by heat treatment in the KCl + LiCl melt
| Autor: | Stepan Ya. Kuchmiy, M.A. Skoryk, Galyna Ya. Grodzyuk, N. S. Andryushina, G. V. Korzhak, V. V. Shvalagin |
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| Rok vydání: | 2019 |
| Předmět: |
Aqueous solution
Potassium Inorganic chemistry Graphitic carbon nitride General Physics and Astronomy chemistry.chemical_element Electron donor 02 engineering and technology Surfaces and Interfaces General Chemistry 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound chemistry Photocatalysis Lithium 0210 nano-technology Carbon nitride Hydrogen production |
| Zdroj: | Applied Surface Science. 475:348-354 |
| ISSN: | 0169-4332 |
| Popis: | It has been shown that post-synthetic heat treatment of g-C3N4 in the melt of potassium and lithium salts leads to a significant increase of photocatalytic activity in the hydrogen formation from aqueous solutions of electron-donor compounds compared to the initial g-C3N4. This could be explained in terms of formation more crystalline graphitic carbon nitride (CGCN) with enhanced ability for absorption of higher amounts of visible light. Simultaneously, this treatment significantly decreases level of electron-hole recombination. It has been established that coincident use of two donors of different nature (organic acid and alcohol) with CGCN significantly increases rate of hydrogen formation. The possible explanation to this phenomenon could be find within acidic activation of CGCN. The influence of a number of factors on the efficiency of photocatalytic hydrogen production under visible light in systems based on the received carbon nitride has been investigated. The apparent quantum yields of the hydrogen evolution process with use of CGCN were determined as 23.6 and 5.6% at 405 and 435 nm, respectively. |
| Databáze: | OpenAIRE |
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