Central-collapsed structure of CoFeAl layered double hydroxides and its photocatalytic performance

Junshan Yang; Chao Li; Derui Liang; Yao Liu; Zhaosong Li; Haiyan Wang; Hanhan Huang; Caifeng Xia; Hui Zhao; Yunyan Liu; Qian Zhang; Zilin Meng

doi:10.1016/j.jcis.2021.01.075

Central-collapsed structure of CoFeAl layered double hydroxides and its photocatalytic performance

J Colloid Interface Sci. 2021 May 15:590:571-579. doi: 10.1016/j.jcis.2021.01.075. Epub 2021 Feb 1.

Authors

Junshan Yang¹, Chao Li¹, Derui Liang¹, Yao Liu², Zhaosong Li³, Haiyan Wang³, Hanhan Huang¹, Caifeng Xia¹, Hui Zhao⁴, Yunyan Liu², Qian Zhang⁵, Zilin Meng⁶

Affiliations

¹ School of Agricultural Engineering and Food Science, Shandong University of Technology, 255049 Zibo, PR China.
² School of Physics and Optoelectronic Engineering, Shandong University of Technology, 255049 Zibo, PR China.
³ School of Chemistry and Chemical Engineering, Shandong University of Technology, 255049 Zibo, PR China.
⁴ School of Resources and Environmental Engineering, Shandong University of Technology, 255049 Zibo, PR China.
⁵ School of Resources and Environmental Engineering, Shandong University of Technology, 255049 Zibo, PR China. Electronic address: zq@sdut.edu.cn.
⁶ School of Resources and Environmental Engineering, Shandong University of Technology, 255049 Zibo, PR China. Electronic address: mzl@sdut.edu.cn.

PMID: 33581660
DOI: 10.1016/j.jcis.2021.01.075

Abstract

Layered double hydroxides (LDHs) has been regarded as one of the most potential photocatalysts for degradation of the pollutants, due to the tunable elements in the laminates, high surface area and exposed active sites. Developing a photocatalyst with a visible light activity and fast charge separation efficiency is a main research focus. In this work, a central-collapsed CoFeAl-LDHs was formed via the selective etching Al³⁺ in the laminates, which relied on the function of OH^- produced by urea hydrolysis. The Central-collapsed structure of CoFeAl-LDHs exhibited enhanced adsorption activity and photocatalytic efficiency. The results show that the pseudo-second-order kinetic model and the Langmuir model are suitable for adsorption behavior. This etching cavity is beneficial to the adsorption of MB and provides a better platform for the direct interaction between MB and CoFeAl-LDHs. The morphology and photoelectrochemical properties of the central-collapsed structure of LDHs were characterized and used to explore the relationship between the etching degree and photocatalytic activity. The photocatalytic properties of all the samples under visible light irradiation were evaluated, and LDH-6 has the best photocatalytic activity. This work provides a novel approach for the fabrication of central-collapsed structure of layered double hydroxides photocatalysts to meet environmental and energy requirements.

Keywords: Adsorption; Central-collapsed structure; Layered double hydroxides; Photocatalysis.