期刊
JOURNAL OF CO2 UTILIZATION
卷 44, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2020.101377
关键词
BiO2-x/g-C3N4; Co-Catalyst; CO2 photoreduction; Oxygen vacancy
资金
- National Key R&D Program of China [2018YFB0605002]
- National Natural Science Foundation of China [21546014]
The study developed a novel BiO2-x co-catalyst coupled g-C3N4 photocatalyst for the photocatalytic reduction of CO2 through a simple hydrothermal approach. The experimental results showed that the composite played a vital role in promoting the photocatalytic capability, leading to significantly increased photocatalytic activity.
Photoreduction CO2 to hydrocarbons are the sustainable and green methods to solve energy shortages and environmental pollution problems. Therefore, the development of efficient and environment-friendly photo-catalysts remains a huge challenge, while coupling co-catalyst on traditional photocatalysts is a potential approach for improving photocatalytic activity. Here, a novel BiO2-x co-catalyst coupled g-C3N4 photocatalyst was prepared by a simple hydrothermal approach for the photocatalytic reduction of CO2. The experimental results proved that BiO2-x/g-C3N4 composites played a vital part for promoting the photocatalytic capability. The 20 % BiO2-x/g-C3N4 composites exhibited the best photocatalytic capability under the simulated visible-light. A maximum yield of CO (42.29 mu mol/gcat) and CH4 (7.2 mu mol/gcat) were obtained, which were 3.8 and 2.5 times that over pure g-C3N4, and its apparent quantum yield (AQY) was 1.5 % at 420 nm. According to the characterization results, the significantly increased photocatalytic activity could be ascribed to larger specific surface area, stronger visible-light absorption properties and more effective separation and transfer of photogenerated electron-hole pairs. Our finding provides a certain reference for the development and application of novel cocatalyst.
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