6/7/2017 Thermodecomposition synthesis of porous β-Bi2O3/Bi2O2CO3 heterostructured photocatalyst with improved visible light photocatalytic activ…

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Thermodecomposition synthesis of porous β-Bi2O3/Bi2O2CO3heterostructured photocatalyst with improved visible lightphotocatalytic activity

Article · September 2015 with 127 ReadsDOI: 10.1039/C5NJ01462J

Abstract

Novel porous β-Bi2O3/Bi2O2CO3 p-n heterostructures were synthesized by partially decomposing porous Bi2O2CO3 at 300-375 °C. The structures,morphologies, optical properties, and speci�c surface areas of the as-synthesized samples were characterized by means of thermogravimetry anddifferential scanning calorimetry, X-ray diffraction, scanning electron microscopy, UV-Vis spectroscopy, and N2 gas adsorption. Two types of dyes,methyl orange (MO) and methylene blue (MB), were chosen as model organic pollutants to evaluate the photocatalytic activity of the as-synthesizedsamples. The porous β-Bi2O3/Bi2O2CO3 p-n heterostructures exhibited much higher photocatalytic activity than β-Bi2O3 and Bi2O2CO3 and MO andMB could be completely degraded within 24 and 50 min, respectively. In addition, phenol as a colorless organic pollutant was also chosen to furtherstudy the photocatalytic activity of Bi2O2CO3, β-Bi2O3 and β-Bi2O3/Bi2O2CO3. The β-Bi2O3/Bi2O2CO3 heterostructures also showed much higherphotocatalytic activity for the photodegradation of phenol than β-Bi2O3 and Bi2O2CO3. The obtained results indicated that the formed p-nheterojunction in the porous β-Bi2O3/Bi2O2CO3 composite signi�cantly contributed to the improvement of electron-hole separation and theenhancement of photocatalytic activity. The mechanisms for the enhanced photodegradation of selected organic pollutants over the β-Bi2O3/Bi2O2CO3composite are discussed in this study. © The Royal Society of Chemistry and the Centre National de la Recherche Scienti�que.

1st Gangqiang Zhu36.55 · Shaanxi Normal University

2nd Yongbao Liu13.63 · Shanxi Normal University

+ 33rd Mirabbos Hojamberdiev43.84 · Turin Polytechnic University in Tashkent

Last Peng Liu42.32 · Shaanxi Normal University

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