Enhanced photocatalytic reduction of hexavalent chromium ions over Zn-bearing in CuZn hydroxy double salts: Insight into the structural investigation using extended X-ray absorption fine structure
Issued Date
2022-07-20
Resource Type
ISSN
09277757
eISSN
18734359
Scopus ID
2-s2.0-85128925741
Journal Title
Colloids and Surfaces A: Physicochemical and Engineering Aspects
Volume
645
Rights Holder(s)
SCOPUS
Bibliographic Citation
Colloids and Surfaces A: Physicochemical and Engineering Aspects Vol.645 (2022)
Suggested Citation
Chuaicham C., Sekar K., Balakumar V., Zhang L., Trakulmututa J., Kidkhunthod P., Smith S.M., Sasaki K. Enhanced photocatalytic reduction of hexavalent chromium ions over Zn-bearing in CuZn hydroxy double salts: Insight into the structural investigation using extended X-ray absorption fine structure. Colloids and Surfaces A: Physicochemical and Engineering Aspects Vol.645 (2022). doi:10.1016/j.colsurfa.2022.128893 Retrieved from: https://repository.li.mahidol.ac.th/handle/20.500.14594/84073
Title
Enhanced photocatalytic reduction of hexavalent chromium ions over Zn-bearing in CuZn hydroxy double salts: Insight into the structural investigation using extended X-ray absorption fine structure
Other Contributor(s)
Abstract
CuZn hydroxy double salts (CuZn-HDS) are often used as adsorbent and Fenton-like catalysts. In this work, we report the photocatalytic activity of CuZn-HDS for Cr(VI) reduction. In detail, CuZn-HDS with different Cu/Zn ratios were prepared as photocatalysts through the metal oxide-assisted hydrothermal method. The CuZn-HDS samples were characterized and applied for photocatalytic reduction of Cr(VI), which is a toxic inorganic pollutant in the wastewater. The CuZn-HDS which has the Cu/Zn ratio of about 4 (CuZn-HDS-4) showed the heist photocatalytic Cr(VI) reduction activity more than other samples, especially for copper hydroxy salts (Cu-HS) which have no Zn in the structure. Thus, the Zn-bearing in CuZn hydroxy double can improve the photocatalytic activity for Cr(VI) reduction compared with Cu-HS. The increase in the Cr(VI) reduction activity of the optimized CuZn-HDS-4 was attributed to the excellent separation and transportation of photogenerated electron-holes pairs, as proven by the photoluminescence, photocurrent density, and electrochemical impedance spectroscopy results. Moreover, the atomic structure of the synthesized CuZn-HDS was elucidated by an extended X-ray absorption fine structure technique, which is the first time to report the CuZn-HDS structure. Based on the optical properties, and activity test, a photocatalytic reduction of Cr(VI) over a CuZn-HDS was proposed. Thus, the CuZn-HDS can be employed as a potential photocatalyst for the detoxification of Cr(VI) in wastewater.