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Photocatalytic activities of novel SrTiO3 – BiOBr heterojunction catalysts towards the degradation of reactive dyes.

Authors :
Kanagaraj, Thamaraiselvi
Thiripuranthagan, Sivakumar
Source :
Applied Catalysis B: Environmental. Jun2017, Vol. 207, p218-232. 15p.
Publication Year :
2017

Abstract

SrTiO 3 nanocube and three dimensional, mesoporous BiOBr catalysts were synthesized by sol-gel and precipitation methods respectively. Various weight percentages of SrTiO 3 -BiOBr heterojunction composite catalysts (x% SrTiO 3 -BiOBr where x = 5, 10, 30, 50 & 70 percentage of SrTiO 3 ) were synthesized by impregnation method. All the synthesized catalysts were characterized by various instrumental techniques. The results of PL and EIS indicate that the heterojunction catalyst, 10% SrTiO 3 -BiOBr (10-ST/BB), has the lowest recombination rate of e − - h + pairs and the lowest electron transfer resistance respectively. Photocatalytic activities of the synthesized catalysts were tested towards the degradation of carcinogenic reactive dyes such as reactive blue 198, reactive black 5 and reactive yellow 145 in presence of visible and solar irradiations. Among the catalysts 10-ST/BB resulted in the highest photocatalytic activity towards the degradation of all the three dyes. Kinetics studies on degradation indicated that it followed pseudo first order. The efficiency of dye degradation was found to be better in the presence of solar light than under visible light degradation due to ≃ 4% UV light in solar irradiation. TOC, HPLC and COD studies confirm that the dyes are mineralized into some organic salts such as acetates, formates, etc., CO 2 , water and salts. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
09263373
Volume :
207
Database :
Academic Search Index
Journal :
Applied Catalysis B: Environmental
Publication Type :
Academic Journal
Accession number :
121671974
Full Text :
https://doi.org/10.1016/j.apcatb.2017.01.084