Enhanced photoactivity for the methyl orange on heterostructure LaCO3OH/Ni–Fe layered double hydroxides prepared from complexing agent-assisted homogeneous precipitation techniques. (August 2022)

• Record Type: Journal Article
• Authors: Ma, Xiang-Rong; Wei, Xian-Yong; Dang, Rui; Guo, Wei; Ren, Meng-Jiao; Kang, Yu-Hong; Li, Xiao; Gao, Yong; Li, Yan-Jun; Bai, Jing-Jun; Liu, Zhi-Pan; Wang, Yu-Fei; Li, Jian; Zong, Zhi-Min
• Is Part Of: Journal of physics and chemistry of solids. Volume 167(2022)
• Publication Date: 2022-08
• Subjects: Layered double hydroxides -- LaCO3OH/Ni–Fe-LDH -- Ni2+-Fe3+-CO32−-LDH -- Photocatalytic -- Wastewater; Solids -- Periodicals; Solides -- Périodiques; Solids; Periodicals; 530.41
• DOI: 10.1016/j.jpcs.2022.110696
• Languages: English
• ISSNs: 0022-3697

Abstract

Abstract: LaCO3 OH/Ni–Fe-LDH was synthesized as a new type of layered double hydroxides (LDHs) by complexing agent-assisted homogeneous precipitation techniques. According multiple characterizations, LaCO3 OH/Ni–Fe-LDH has LDH phase with platelet-like particles and mesoporous properties with 141 m 2 g −1 of specific surface area. In addition, both lanthanum and iron are present in the composites, resulting in a significant decrease in the band gap to 2.04 eV, which is lower than that of either Ni–Fe-LDH (2.43 eV) or Ni–Al-LDH (4.86 eV). Compared with Ni–Fe-LDH and Ni–Al-LDH, LaCO3 OH/Ni–Fe-LDH significantly improved photocatalytic performance and effectively decomposed methyl orange (MO) under visible light exposure. The increased photocatalytic efficiency from LaCO3 OH/Ni–Fe-LDH is mainly ascribed to the lower band gap and higher adsorption performance. In addition, LaCO3 OH/Ni–Fe-LDH has an interface region produced by the recombination of semiconductors with LaCO3 OH and Ni–Fe-LDH structures, which can effectively improve the separation of photocarriers and expand the energy range of photoexcitation. Moreover, a plausible mechanism for photocatalytic decomposition of MO was presented.