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 Bi₂MoO_6-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 Bi₂MoO_6-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.

Key words: Photocatalytic reduction CO₂, Photodegradation organic pollutants, Oxygen vacancies, S-scheme heterojunction, Bi₂ MoO_6-x/MoS₂