Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification
K and Na have been widely used in photocatalytic H<sub>2</sub>O<sub>2</sub> production. However, Rb and Cs have rarely been studied for their photocatalytic potentials. In addition, the mechanism regulating H<sub>2</sub>O<sub>2</sub> production from di...
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MDPI AG
2023-01-01
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| Online Access: | https://www.mdpi.com/2073-4344/13/2/218 |
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| author | Zehao Li Yufei Chen |
| author_facet | Zehao Li Yufei Chen |
| author_sort | Zehao Li |
| collection | DOAJ |
| description | K and Na have been widely used in photocatalytic H<sub>2</sub>O<sub>2</sub> production. However, Rb and Cs have rarely been studied for their photocatalytic potentials. In addition, the mechanism regulating H<sub>2</sub>O<sub>2</sub> production from different alkali metal (M)-modified polymeric carbon nitride (PCN) is still unknown. Therefore, M-doped PCN was fabricated using thermal copolymerization in the presence of Li, Na, K, Rb, or Cs. The activity of CN-M was enhanced by the increase in the metallic character of alkali metals. However, CN-Cs’s photocatalytic H<sub>2</sub>O<sub>2</sub> activity is not optimal even though it has the strongest metallic character. A stronger metallic character is anticipated to yield stronger Lewis acidic sites. Although ethanol can be adsorbed and activated at strong Lewis acidic sites, H<sub>2</sub>O<sub>2</sub> can also be activated at these sites, which speeds up H<sub>2</sub>O<sub>2</sub> degradation. CN-Rb—with its acceptable metallic character, excellent oxygen adsorption capacity, and reduced H<sub>2</sub>O<sub>2</sub> degradation—has the best photocatalytic H<sub>2</sub>O<sub>2</sub> yield. |
| first_indexed | 2024-03-11T09:02:29Z |
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| institution | Directory Open Access Journal |
| issn | 2073-4344 |
| language | English |
| last_indexed | 2024-03-11T09:02:29Z |
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| spelling | doaj.art-ecff32f26e424b158cf937527b997fd02023-11-16T19:39:56ZengMDPI AGCatalysts2073-43442023-01-0113221810.3390/catal13020218Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal ModificationZehao Li0Yufei Chen1Guangdong Provincial Key Laboratory of Chemical Measurement and Emergency Test Technology, Institute of Analysis, Guangdong Academy of Sciences (China National Analytical Center, Guangzhou), Guangzhou 510070, ChinaSchool of Chemistry and Chemical Engineering, Anyang Normal University, Anyang 455000, ChinaK and Na have been widely used in photocatalytic H<sub>2</sub>O<sub>2</sub> production. However, Rb and Cs have rarely been studied for their photocatalytic potentials. In addition, the mechanism regulating H<sub>2</sub>O<sub>2</sub> production from different alkali metal (M)-modified polymeric carbon nitride (PCN) is still unknown. Therefore, M-doped PCN was fabricated using thermal copolymerization in the presence of Li, Na, K, Rb, or Cs. The activity of CN-M was enhanced by the increase in the metallic character of alkali metals. However, CN-Cs’s photocatalytic H<sub>2</sub>O<sub>2</sub> activity is not optimal even though it has the strongest metallic character. A stronger metallic character is anticipated to yield stronger Lewis acidic sites. Although ethanol can be adsorbed and activated at strong Lewis acidic sites, H<sub>2</sub>O<sub>2</sub> can also be activated at these sites, which speeds up H<sub>2</sub>O<sub>2</sub> degradation. CN-Rb—with its acceptable metallic character, excellent oxygen adsorption capacity, and reduced H<sub>2</sub>O<sub>2</sub> degradation—has the best photocatalytic H<sub>2</sub>O<sub>2</sub> yield.https://www.mdpi.com/2073-4344/13/2/218carbon nitridehydrogen peroxidephotocatalysisalkali metals |
| spellingShingle | Zehao Li Yufei Chen Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification Catalysts carbon nitride hydrogen peroxide photocatalysis alkali metals |
| title | Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification |
| title_full | Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification |
| title_fullStr | Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification |
| title_full_unstemmed | Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification |
| title_short | Unraveling the Mechanism for H<sub>2</sub>O<sub>2</sub> Photogeneration on Polymeric Carbon Nitride with Alkali Metal Modification |
| title_sort | unraveling the mechanism for h sub 2 sub o sub 2 sub photogeneration on polymeric carbon nitride with alkali metal modification |
| topic | carbon nitride hydrogen peroxide photocatalysis alkali metals |
| url | https://www.mdpi.com/2073-4344/13/2/218 |
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