Preparation and Photocatalytic Properties of LnBaCo₂O_5+δ (Ln = Eu, Gd, and Sm)

Bingqian Han¹, Yuxiu Li¹, Nan Chen¹, Dongyang Deng¹, Xinxin Xing¹, Yude Wang^1,2

¹Department of Materials Science and Engineering, Yunnan University, Kunming, China.
²Yunnan Province Key Lab of Micro-Nano Materials and Technology, Yunnan University, Kunming, China.

DOI: 10.4236/msce.2015.34003                

Abstract

A new type of photocatalytic material, double-perovskite oxides, LnBaCo₂O_5+δ (Ln = Eu, Gd, and Sm) was synthesized via a conventional solid-state reaction process using Ln₂O₃, BaCO₃ and Co₂O₃ as raw materials. X-ray diffraction results show that the crystalline structures are a pure orthorhombic lattice and are consistent with LnBaCo₂O_5+δ microparticles. The photocatalytic activity of the LnBaCo₂O_5+δ (Ln = Eu, Gd, and Sm) powders was further demonstrated in the degradation of Congo red (CR) under ultraviolet light irradiation with the dye solution concentration of 25 or 50 mg·L-1. The double-perovskite oxides LnBaCo₂O_5+δ show a certain photocatalytic activity during the degradation of CR under ultraviolet light, which means that they are one kind of the promising photocatalytic materials for the degradation of the azo dyes.

Keywords

Double-Perovskite, LnBaCo2O_5+δ , Photocatalysis, Congo Red

Conflicts of Interest

The authors declare no conflicts of interest.

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