Study on the preparation of CdS/TiO2 corn straw biochar composite materials for photocatalytic reduction of CO2 and collaborative H2 production.

Autor: Zhou, Yunlong, Sun, Meng, Lin, Chunmian
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Zdroj: Environmental Science & Pollution Research; Jul2024, Vol. 31 Issue 35, p48222-48232, 11p
Abstrakt: A thermal synthesis method was employed in this work to prepare CdS/TiO2 corn straw biochar photocatalytic composite materials suitable for synergistic hydrogen production with the photocatalytic reduction of CO2. The structure and synergistic reaction of these composite materials were characterized by its photogenerated electron transfer process. Compared with pure TiO2, the energy band gap of the optimal CdS/TiO2 corn straw biochar composite material was reduced to 2.89 eV. The heterostructure coupling between TiO2 and CdS in the biochar accelerated the transfer of photogenerated electrons and reduced the recombination rate of photogenerated electrons and holes. Under visible light irradiation, the photocatalytic H2 yield of this CdS/TiO2 corn straw-derived biochar composite material was 1200 µmol·h−1·g−1, the CO yield was 150 µmol·h−1·g−1, and the CH4 yield was 55 µmol·h−1·g−1. The key to this synergistic reaction is the formation of heterojunctions between CdS and TiO2 as well as the rapid oxidation of holes in the composite material caused by the doping of biochar. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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