Temperature-induced phase changes in bismuth oxides and efficient photodegradation of phenol and p-chlorophenol

JOURNAL OF HAZARDOUS MATERIALS

卷:301

Article

Hu, Yin^1,2  Li, Danzhen²  Sun, Fuqian¹  Weng, Yaqing¹  You, Shengyong¹  Shao, Yu² 

[1] Jiangxi Acad Sci, Res Inst Appl Chem, Nanchang 330096, Jiangxi, Peoples R China

[2] Fuzhou Univ, State Key Lab Photocatalysis Energy & Environm, Res Inst Photocatalysis, Fuzhou 350002, Peoples R China

关键词: Bismuth oxide;    Mixed valence;    Photodegradation;    Phenol;    p-Chlorophenol;   

DOI  :  10.1016/j.jhazmat.2015.09.008

来源: Elsevier

【 摘 要 】

A novel, simple and efficient approach for photodegrading phenol and p-chlorophenol, based on BixOy, was reported for the first time. Monoclinic Bi2O4 was prepared by the hydrothermal treatment of NaBiO3 center dot 2H(2)O. A series of interesting phase transitions happened and various bismuth oxides (Bi4O7, beta-Bi2O3 and alpha-Bi2O3) were obtained by sintering Bi2O4 at different temperatures. The results demonstrated that the Bi2O4 and Bi4O7 phase had strong abilities towards the oxidative decomposition of phenol and p-chlorophenol and very high rates of TOC removal were observed. The characterization by XRD and XPS revealed that Bi4+ in Bi2O4 and Bi3.5+ in Bi4O7 were reduced to Bi3+ during the reaction process. Singlet oxygen (O-1(2)) was identified as the major reactive species generated by Bi2O4 and Bi4O7 for the photodegradation of p-chlorophenol and phenol. This novel approach could be used as a highly efficient and green technology for treating wastewaters contaminated by high concentrations of phenol and chlorophenols. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

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