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Compared with bulk graphite carbon nitride, the improved sample has 2.93 times the photocatalytic nitrate reduction ammonia activity (2.627 mg/h/gcat), and the NH3 selectivity increases from 50.77% to 77.9%.
The researchers published their method in the September 6th issue of Progress in Energy Materials.
Stirring in the green tea solution every day can reduce some high-valent iron to metal, which can significantly improve the photocatalytic activity of semiconductors.
Here, waste green tea bags are used to reduce Ru3+. When exposed to simulated sunlight, the photocatalytic activity of the improved sample is 2.93 times that of the bulk g-C3N4, according to the corresponding author, Peking University professor Bing-Jie Ni . University of Technology Sydney (UTS) School of Civil and Environmental Engineering Water and Wastewater Technology Center (CTWW).
At present, ammonia is mainly produced by the Haber method, which converts gaseous nitrogen and moisture into ammonia under high temperature and high pressure with the assistance of a catalyst. The synthesis of ammonia consumes about 2% of the world's energy every year, leading to serious carbon dioxide emissions. Therefore, there is an urgent need to develop a green synthesis method for ammonia under normal temperature conditions.
Bing-Jie Ni, Professor, Research Correspondence Author, Water and Wastewater Technology Center, School of Civil and Environmental Engineering, University of Technology Sydney
Ni continued: "The use of solar energy to convert nitrate into ammonia is of great significance because it can not only eliminate water pollutants, but also synthesize high-value chemicals."
Ni and his team are involved in the field of renewable energy production, especially the interface between environmental technology and chemical engineering. They focus on combining these disciplines to create advanced and sustainable technological solutions to achieve efficient power generation from renewable resources.
However, reducing nitrate to ammonia is kinetic and thermodynamically challenging because it is a multi-step eight-electron process. Based on experimental and theoretical research, the introduction of Ru into g-C3N4 can not only promote light absorption and nitrate adsorption, but also accelerate the separation of electron-hole pairs.
Bing-Jie Ni, Professor, Research Correspondence Author, Water and Wastewater Technology Center, School of Civil and Environmental Engineering, University of Technology Sydney
"The thermodynamic energy barrier of the rate-determining step in the reduction of nitrate to ammonia is calculated to be less than 0.75 eV, which is much lower than the competitive hydrogen production (0.98 eV) and nitrogen formation (1.36 eV), leading to a preference for ammonia production," Ni added road.
The results and insights of this research may provide a new platform for the simple and green synthesis of metal particle modified photocatalysts for reducing nitrate in the surrounding environment to ammonia.
Other major contributors include Dr. Jaiwei Ren, Dr. Derek Hao, Prof. Ho Kyong Shon and A/Prof. Wang Ying from the Water and Wastewater Technology Centre of the University of Technology Sydney, a researcher at the Changchun Institute of Applied Chemistry, Chinese Academy of Sciences.
This research was supported by the Australian Research Council Future Scholarship (FT160100195), National Natural Science Foundation of China (21673220), Sichuan Provincial Department of Science and Technology (2017GZ0051), National Key Research and Development Program (2016YFA0602900)), Jilin Province Science and Technology Development Plan (20190201270JC, 20180101030JC) .
Hao, D., etc. (2021) Green synthesis of Ru modified g-C3N4 nanosheets for enhancing photocatalytic ammonia synthesis. Progress in energy materials. doi.org/10.34133/2021/9761263.
Source: https://english.bit.edu.cn/
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