NDLI: Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

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Fabrication of Hydrotalcite-like Copper Hydroxyl Salts as a Photocatalyst and Adsorbent for Hexavalent Chromium Removal

Content Provider	MDPI
Author	Chuaicham, Chitiphon Sekar, Karthikeyan Balakumar, Vellaichamy Zhang, Li Trakulmututa, Jirawat Smith, Siwaporn Meejoo Sasaki, Keiko
Copyright Year	2022
Description	Cu-HyS-urea and Cu-HyS-NaOH, which are hydrotalcite-like copper hydroxyl salts, were prepared by two different methods, urea hydrolysis and precipitation, respectively. Both synthesis methods provided the successful formation of a copper hydroxyl salt, $Cu_{2}(OH)_{3}NO_{3}$. From XRD and UV-DRS results, the product from the urea hydrolysis methods (Cu-HyS-urea) displayed higher crystallinity, small bandgap energy (Eg), and high light absorption ability because of some intercalated carbonate anions. For the Cr(VI) removal test, the Cu-HyS-NaOH showed superior adsorption of Cr(VI) than Cu-HyS-urea due to a higher specific surface area, confirmed by BET analysis. However, the Cu-HyS-urea presented higher photocatalytic Cr(VI) reduction under light irradiation than Cu-HyS-NaOH, owing to narrow Eg, less recombination, and a high transfer of the photogenerated charge carriers, proven by the results from photoluminescence, photocurrent density, and electrochemical impedance spectroscopy. Thus, this work provides a new function of the hydrotalcite-like copper hydroxyl salts (Cu-HyS-urea and Cu-HyS-NaOH) that can be utilized not only for adsorption of Cr(VI) but also as photocatalysts for Cr(VI) reduction under light irradiation.
Starting Page	182
e-ISSN	2075163X
DOI	10.3390/min12020182
Journal	Minerals
Issue Number	2
Volume Number	12
Language	English
Publisher	MDPI
Publisher Date	2022-01-30
Access Restriction	Open
Subject Keyword	Minerals Environmental Engineering Environmental Sciences Hydrotalcite Cr(vi) Reduction Copper Hydroxyl Salt Photocatalyst Adsorption
Content Type	Text
Resource Type	Article

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