Science & Technology

Use green tea as a reducing reagent for the preparation of nanomaterials for synthesizing ammonia

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Researchers have shown that green tea can be used as a reducing reagent for the preparation of nanomaterials for the synthesis of ammonia. The optimal sample compared to bulk graphitic carbon nitride had a 2.93-fold reduction to ammonia activity (2.627 mg / h / g) with photocatalytic nitrate.Cat), And NH3 Selectivity increased from 50.77% to 77.9%.The team announced their approach on September 6th Advances in energy materials..


Some high valence iron can be reduced to metal by simply stirring with a green tea solution. This can significantly improve the photocatalytic activity of semiconductors.Here, waste green tea bags were used to reduce Ru3 years old and overThe photocatalytic activity of the optimized sample was 2.93 times that of bulk gC.3NSFour According to the corresponding author, Bing-Jie Ni, a professor at the Water and Sewerage Technology Center (CTWW) of the Faculty of Civil and Environmental Engineering at the University of Technology Sydney (UTS), under simulated sunlight.

“Currently, ammonia is mainly produced by the harbor process, where gaseous nitrogen and water gas are converted to ammonia under high temperature and pressure with the help of catalysts. Ammonia synthesis consumes about 2% annually. To do. Global energy, Leads to serious carbon dioxide emissions. Therefore, there is an urgent need to develop a green synthesis of ammonia under ambient conditions, “Ni said. Solar energy sweep under the carpet nitrate Ammonia is very important because it not only removes water pollutants, but also synthesizes high-value chemicals. “

Ni and his team are working on the field of renewable energy production, especially the interface between chemical engineering and environmental technology. They are focusing on the integration of these areas to develop innovative and sustainable technology solutions to achieve efficient energy generation from renewable resources.

“But the reduction of nitrates to ammonia is very difficult from a kinetic and thermodynamic point of view because it is an eight-electron process with multiple steps,” Ni explained. “Experiment and Theoretical study, Introducing Ru to gC3NSFour Not only can it promote light absorption and nitrate adsorption, but it can also accelerate the separation of electron-hole pairs.

thermodynamics energy The rate-determining step barrier of nitrate reduction to the ammonia process is calculated to be less than 0.75 eV. This is much lower than the competing hydrogen production (0.98 eV) and nitrogen production (1.36 eV), and the production of ammonia takes precedence. .. “

The results and findings of this study may provide a new platform for the easy and green synthesis of metal particle modified photocatalysts for reducing nitrates. ammonia Under ambient conditions.


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For more information:
Derek Hao et al, Green Synthesis of Ru-Modified g-C3N4 Nanosheets for Enhanced Photocatalytic Ammonia Synthesis, Advances in energy materials (2021). DOI: 10.34133 / 2021/9761263

Provided by Beijing Institute of Technology

Quote: Reagent for the preparation of nanomaterials for the synthesis of ammonia, obtained from https://phys.org/news/2021-12-green-tea-reagent-nanomaterials-ammonia on December 3, 2021. Green tea is used as a reagent (December 3, 2021). html

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Use green tea as a reducing reagent for the preparation of nanomaterials for synthesizing ammonia

https://phys.org/news/2021-12-green-tea-reagent-nanomaterials-ammonia.html Use green tea as a reducing reagent for the preparation of nanomaterials for synthesizing ammonia

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