Novel oxygen vacancy-enriched Bi2MoO6-x/MoS2 S-scheme heterojunction for strengthening photocatalytic reduction CO2 and efficient degradation of levofloxacin hydrochloride: Mechanism, DFT calculations

Abstract

Constructing new photocatalysts for the photocatalytic reduction of CO2 and efficient degradation of Levofloxacin is of great importance to renewable energy. Here, S-scheme Bi2MoO6-x/MoS2 heterojunction nanospheres containing abundant surface defects (oxygen vacancies) were designed and successfully synthesized to enhance CO2 photoreduction activity in the absence of other sacrificial agents, co-catalysts or photosensitisers. At the same time, it can efficiently degrade organic pollutants (Levofloxacin). This heterogeneous structure with surface defects provides an abundance of reactive sites, accelerates charge separation and improves oxidation capacity. The improved Bi2MoO6-x/MoS2 heterogeneous nanospheres show excellent performance under simulated solar light, with the selectivity and yield of 92.45% and 29.01 µmol h−1, respectively, for the generation of CO. Under visible light, the degradation efficiency of levofloxacin hydrochloride (LVX) reached 96.3% within 25 min and remained as high as 95% after three cycles. This work provides a new idea for the design of new S-scheme photocatalysts and an important reference for the preparation of photocatalysts for the efficient photocatalytic reduction of CO2 and the efficient degradation of organic pollutants at the same time.