期刊
CHEMICAL ENGINEERING JOURNAL
卷 430, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2021.132668
关键词
Carbon nitride; Homojunction; Visible photocatalysis; CO2 absorption and activation
资金
- National Natural Science Fund of China [22005117, 52072146, 21763010]
- Research Foundation of Education Bureau of Hunan Province, China [20B473]
- National College Students Innovation and Entrepreneurship Training Program in China [S202010531004]
This study reports the superior performance of a homojunction material MTCN in CO2 photocatalytic reduction, which is prepared by thermal polymerization and calcination under air, exhibiting improved porosity and photoelectric conversion efficiency.
The value-added conversion of CO2 by photocatalytic reduction is considered as a potential way to solve the current energy and environmental crisis. In this paper, we report that a mechanical mixture of the as-thermally polymerized melamine (Me)- and 3-amino-1,2,4-triazole (AT)-based nitride carbons (MCN and TCN) can turn into a homojunction material (MTCN) by a calcination under air. A series of characterizations and photo-catalytic tests, combined with DFT calculations, support that the constructed MTCN has an improved porosity and photoelectric conversion efficiency. And the nitrogen-rich structure not only broadens the visible light response range but also provides stronger Lewis basic sites for the adsorption and activation of CO2 at the surface. As a result, MTCN exhibits the most outstanding performance on tetracycline degradation under visible light illumination. In particular, its photo-catalytic efficiency for the visible-triggered CO2 reduction under normal temperature and pressure can reach 7.75 mu mol.g(-1).h(-1), which is 13.8 or 16.1 times higher than the single MCN or TCN. This work provides a facile pathway to construct CN-based homojunction photocatalyst for the efficient conversion of CO2 into valuable products.
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