Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 279, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2020.119390
Keywords
Photocorrosion; U(VI); Photoreduction; SnO2/CdCO3/CdS
Funding
- National Natural Science Foundation of China [21876047, 21836001]
- Fundamental Research Funds for the Central Universities [2019MS040]
- Thousand Talents Plan of Qinghai province
- National Key Research, Development Program of China [2017YFA0207002]
- Basic Research Program of Qinghai Province [2018-ZJ-706]
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Reducing soluble U(VI) to insoluble U(IV) is an ideal strategy to collect/remove uranium in water. In this work, a new way is reported to achieve this reduction through a photocorrosion-related photocatalysis process of SnO2/CdCO3/CdS (SCC) under visible light irradiation. The mechanism is systematically studied and discussed through a variety of characterization methods, such as X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), Mott-Schottky test, etc. The matching of energy band ensures the separation of photoelectrons and holes, which results in the decrease of charges' recombination rate and the enhancement of photoreduction activity. The reduction process can be efficiently performed in the ternary complex of SCC in that the photo-generated holes are consumed by oxidization of S2- to S-0 on CdS in SCC. Furthermore, uranium extraction could be achieved by SCC without any protective gases or electronic sacrificial agent, which shows great advantages in applications of U(VI) collection/removal.
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