Novel approach to enhance performance of graphitic carbon nitride

19-Mar-2020 - China

In a report published in NANO, scientists from the Jiangxi University of Science and Technology, Guangdong University of Petrochemical technology, Gannan Medical University and Nanchang Hangkong University in China underline the importance of defect engineering to promote catalytic performance by providing a simple and efficient way for modifying and optimizing metal-free semiconductor photocatalyst graphitic carbon nitride (g-C₃N₄) to solve the dual problems of environmental pollution and lack of fossil resources.

With the rapid growth of industrialization and population, environmental pollution and shortage of fossil resources have become two major challenges for sustainable social development in the 21st century. Hence, the development of green treatment technology is an imperative.

Semiconductor photocatalysis technology has become one of the most promising strategies due to its green, nontoxic and high efficiency by using solar energy. Recently, graphitic carbon nitride (g-C₃N₄), as a new semiconductor photocatalyst of nonmetallic polymer, has attracted wide attention in photo-catalytic field due to its better stability and optical properties. The photocatalytic activity of bare g-C₃N₄ is unsatisfactory due to its smaller surface area and rapid recombination of photogenerated carriers under visible light irradiation.

In this work, urea was used as the activated support for the nitrogen vacancies on the basis of bare g-C₃N₄ by the calcination of melamine. This led to great improvement of photocatalytic performance for the degradation of organic dyes in water, such as rhodamine (RhB), acid orange II, methyl orange (MO) and methyl blue (MB) under visible light irradiation (λ > 420nm). Thus, electrocatalytic performance for hydrogen evolution was achieved due to broader light response, efficient generation and migration of electron/hole charge carriers.

It is hoped that this research will provide an idea about the innovative design, synthesis and fabrication of modifying g-C₃N₄ and other N-based photocatalysts. There is potential for applying this catalyst to the treatment of environmental pollutants and the preparation of new energy.

Original publication

Xiaoxiao Li et al.; "A Novel Approach to Synthesize Nitrogen-Deficient g-C3N4 for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution"; NANO; 2020

https://www.chemeurope.com/en/news/1165459/novel-approach-to-enhance-performance-of-graphitic-carbon-nitride.html

Original publication

Xiaoxiao Li et al.; "A Novel Approach to Synthesize Nitrogen-Deficient g-C3N4 for the Enhanced Photocatalytic Contaminant Degradation and Electrocatalytic Hydrogen Evolution"; NANO; 2020

Topics

carbon nitride photocatalysts photocatalysis

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Organizations

World Scientific Publishing