期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 263, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2019.118353
关键词
CO2 photoreduction; Brookite TiO2; Anatase TiO2; Heterophase junction; PbO decoration
资金
- National Natural Science Foundation of China [21573166, 21271146, 20973128, 20871096]
- Science & Technology Program of Science, Technology and Innovation Commission of Shenzhen Municipality [JCYJ20180302153921190]
- Fundation for Creative Research Groups of Hubei Province [2014CFA007]
- Natural Science Foundation of Jiangsu Province [BK20151247]
Converting CO2 into solar fuels can deliver dual benefits to reducing the atmospheric CO(2 )levels and mitigating the energy shortage. Herein, PbO-decorated TiO2 composites (PbO/TiO2) are synthesized by a one-pot hydrothermal method. It is found that Pb2+ ions cause the product transforming from brookite TiO2 quasi nanocubes (pristine TiO2) into heterophase junctions composed by brookite nanorods and anatase nanoparticles. By using as photocatalyst, 1.0% PbO/TiO2 delivers the best CH4/CO production activities of 53.21/5.99 mu mol g(-1) h(-1) with an overall photoactivity of 437.7 mu mol g(-1)h(-1). It is 33.2 times of the pristine TiO2 with an overall photoactivity of 13.2 mu mol g(-1)h(-1). Further investigations demonstrate that the heterophase junctions can effectively retard the charge recombination, and the PbO promotes the CO2 adsorption/activation processes, and therefore causing the remarkably enhanced activity. The present work opens up an ideal synthetic route for metal oxide-assistant TiO2 heterophase junctions with highly photoactive CO2 conversion.
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