期刊
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
卷 630, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.colsurfa.2021.127606
关键词
Dual functional photocatalysts; CoNiWO4/g-CN; Z-scheme system; Degradation of pollutants; Conversion of benzyl alcohol
资金
- Center for Environmental Science and Engineering, IIT Kanpur
- Science and Engineering Research Board
- Ministry of Human Resource Development, Delhi, India [SERB-IMPRINT/2018/000252]
- IIT Kanpur for the Institute Postdoctoral Fellowship [PDF-180]
A series of novel Z-scheme-based CoxNi1-xWO4/g-C3N4 photocatalysts were synthesized to enhance redox abilities and improve photocatalytic activities. The composite material showed high efficiency in degrading complex organic pollutants and selectively transforming benzyl alcohol to benzaldehyde through a Z-scheme charge transfer pathway. The results provide a new direction for the development of efficient Co-Ni bimetallic tungstate-based photocatalysts for various redox reactions.
Designing a photocatalyst with strong redox ability and broad absorption of visible light is challenging in the field of photocatalysis. In this study, a series of novel Z-scheme-based CoxNi1-xWO4/g-C3N4 (x = 0, 0.2, 0.5, 0.8 and 1) photocatalysts are synthesized with a view to increasing their redox abilities and improve their photo catalytic activities under broad absorption of visible light. The physicochemical properties are investigated, and the data show that an intimate stable heterojunction is formed between the bimetallic tungstate (CoNiWO4) and g-C3N4 (g-CN). Bifunctional properties of the synthesized catalysts are assayed by studying the decomposition of rhodamine B (RhB), bisphenol A (BPA), and selective conversion of benzyl alcohol (BA) to benzaldehyde (BDA). The composite material containing 1:1 molar ratio of Co/Ni shows the highest activity towards the degradation of RhB (99.8%) and BPA (99.32%), and the conversion of BA to BDA (86.96%), each at 1 g/L-dose. The well matched band structure between CoNiWO4 and g-CN facilitates the formation of a Z-scheme charge transfer path, which prolongs the life time of the photoinduced charge carriers with high redox power, thus enhancing the photocatalytic activity. An intensive study of the mechanism proves that the degradation is driven by the hydroxyl ((OH)-O-center dot) and superoxide (O-center dot(2)-) radicals, indicating that CoNiWO4/g-CN follows the Z-scheme charge transfer pathway. The current study has shown the superior photocatalytic activity among all tungstate-based hybrid photocatalytic materials for the degradation of complex organic pollutants, and selective transformation of BA to BDA. The findings in this study provide a new direction to the development of an efficient direct Z-scheme Co-Ni bimetallic tungstate-based photocatalyst for several redox reactions, especially mineralization of recalcitrant aqueous organic compounds.
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