The dissociation of H2O molecules plays an important role in producing protons for promoting hydrogenation reduction of CO2. Therefore, developing excellent photocatalysts to promote the dissociation of H2O molecules and reveal the effect mechanism is the key research direction to enhance CO2 reduction efficiency. In this work, we synthesized BiSbO4 with oxygen vacancies (OVs) to investigate the photocatalytic mechanism of CO2 conversion and H2O dissociation. Experimental results indicate that the introduction of OVs into BiSbO4 can enhance the absorption capacity of light, narrowing band gaps and impeding the recombination of photogenerated carriers. Importantly, the existence of OVs in BiSbO4 can promote the adsorption and activation of H2O molecules via the stronger covalent interaction, which facilitates the dissociation of H2O molecules to generate more protons and lowers the energy barriers of •COOH to improve the efficiency of CO2 reduction. This study reinforces our understanding of the principle of photocatalytic CO2 reduction and the important role of H2O dissociation in photocatalytic CO2 conversion.
Creating high-performance gas sensors for heptanal detection at room temperature demands the development of sensing materials that incorporate distinct spatial configurations, functional components, and active surfaces. In this study, we employed a straightforward method combining hydrothermal strategy with ultrasonic processing to produce mesoporous graphene quantum dots/bismuth antimonate (GQDs/BiSbO4) with nanorod cluster forms. The BiSbO4 was incorporated with appropriate contents of GQDs resulting in significantly improved attributes such as heightened sensitivity (59.6@30 ppm), a lower threshold for detection (356 ppb), and quicker period for response (40 s). A synergistic mechanism that leverages the inherent advantages of BiSbO4 was proposed, while its distinctive mesoporous hollow cubic structure, the presence of oxygen vacancies, and the catalytic enhancement provided by GQDs lead to a marked improvement in heptanal detection. This work introduces a straightforward and effective method for crafting sophisticated micro–nanostructures that optimize spatial design, functionality, and active mesoporous surfaces, showing great promise for heptanal sensing applications.
Xinbo Wang,Weijun Tian,Bingkun Liu,Bingjie Huo,Xinran Yu,Minghan Li,Ke Yang,Wei Bao
Chlorpyrifos (CPF), as a widely applied organophosphate insecticide, poses a severe threat to ecological safety and human health due to its environmental persistence and potential neurotoxicity. Photocatalysis is considered an effective strategy for removing organic pollutants from aquatic systems. This study constructed a novel BiSbO 4 /Ag 2 S heterojunction photocatalyst to enhance the utilization efficiency of visible light. An exploration was conducted into the impact of various environmental factors on CPF degradation, and a subsequent analysis was performed on the degradation mechanism. Experimental results indicated that a CPF degradation rate of approximately 97% was achieved within 2 h of visible light irradiation. After five consecutive cycles, the degradation efficiency decreased by 12.91%, demonstrating its robust reusability. Superoxide radicals (·O 2 − ) and photogenerated holes (h + ) were identified as the primary reactive species playing a crucial role in the degradation process. Furthermore, the intermediate products formed during CPF degradation were analyzed, potential degradation pathways were proposed, and the toxicity of both CPF and its intermediates was assessed. The construction of a BiSbO 4 /Ag 2 S p-n heterojunction induced a directed internal electric field that effectively regulated the spatial charge transfer and separation, thereby facilitating the efficient production of reactive species for enhanced CPF degradation. This study provided new insights for developing high-efficiency heterojunction materials to remove persistent pesticide pollutants from the environment.
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