Preparation of Ni/Ce Composite Photocatalytic CO2 Heterojunction by Treating Electroplating Nickel Wastewater. Issue 28 (26th July 2022)

• Record Type: Journal Article
• Authors: Lin, Shengnan; Zhang, Tingan; Xu, Taiyu; Fuyang, Chengzhen
• Is Part Of: ChemistrySelect. Volume 7:Issue 28(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2022-07-26
• Subjects: Ni-containing electroplating sewage -- carbon dioxide -- electroconversion -- photocatalytic -- heterojunction; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202200817
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: In the past few years, it was discovered that Ni(OH)2 is an effective photocatalyst for CO2 as a chemical fuel catalyst. Ni(OH)2 nanosheets were prepared by simple wet treatment and electric transformation of nickel‐containing wastewater. The Ni(OH)2 /Ce(OH)4 hybrid nanosheets were prepared by Ce doping experiment, and Ni/Ce oxide was prepared by calcination with Ni(OH)2 /Ce(OH)4 composite nanosheets. Finally, Ce(OH)4 was prepared by electroconversion with CeCl3 ⋅ 7H2 O as raw material, and all the samples were used as CO2 photocatalysts for performance comparison. The diameter and thickness of Ni(OH)2 /Ce(OH)4 and NiO/CeO2 nanocrystals are about 1∼50 nm and 1∼10 nm, respectively. The BET‐specific surface area is calculated to be 205.93 m 2 /g (Ni(OH)2 /Ce(OH)4 ) and 18.93 m 2 /g (NiO/CeO2 ). During CO2 photoreduction, bare Ce(OH)4 can only produce CO (1.32 μmol after 4 h). The methane yield of Ni(OH)2 /Ce(OH)4 is 11.435 μmol after 4 h, while the CO yield increases to 21.515 μmol after 4 h. Compared with the oxide NiO/CeO2, the electrolytic product Ni(OH)2 /Ce(OH)4 showed a higher photocatalytic activity for CO2 reduction, which is attributed to the larger specific surface area of the precursor. We believe this work provides a potential approach for treating nickel‐containing electroplating wastewater to prepare highly efficient and selective CO2 reduction photocatalysts. Abstract : In recent years, Ni(OH)2 has been found to be an effective photocatalyst for CO2 as a catalyst. In this paper, Ni(OH)2 nanoparticles were prepared by simple wet treatment and electric transformation of nickel‐containing wastewater. The Ni(OH)2 /Ce(OH)4 hybrid nanosheets were prepared by Ce doping experiment, and Ni/Ce oxide was prepared by calcination. Compared with NiO/CeO2, the electrolytic product Ni(OH)2 /Ce(OH)4 showed a higher photocatalytic activity for CO2 reduction, which is attributed to the larger specific surface area of the precursor.