Visible light photocatalytic degradation of dyes by bismuth oxide-reduced graphene oxide composites prepared via microwave-assisted method

[Display omitted] •Bi2O3–RGO composite is synthesized by microwave-assisted reaction.•The photocatalytic degradation of MO and MB by Bi2O3–RGO is investigated.•High MO and MB degradation rates are achieved under visible light irradiation. Bi2O3-reduced graphene oxide (RGO) composites were successful...

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Bibliographic Details
Published in:Journal of colloid and interface science 2013-10, Vol.408, p.145-150
Main Authors: Liu, Xinjuan, Pan, Likun, Lv, Tian, Sun, Zhuo, Sun, Chang Q.
Format: Article
Language:English
Subjects:
adsorption
Bi2O3–RGO
bismuth
Chemistry
Degradation
dielectric spectroscopy
Dyes
Exact sciences and technology
General and physical chemistry
Graphene
graphene oxide
irradiation
Methyl orange
Methylene blue
microwave treatment
Microwave-assisted reaction
Oxides
Performance enhancement
Photocatalysis
Photochemistry
Physical chemistry of induced reactions (with radiations, particles and ultrasonics)
Reduction
Scanning electron microscopy
transmission electron microscopy
X-ray diffraction
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Summary:[Display omitted] •Bi2O3–RGO composite is synthesized by microwave-assisted reaction.•The photocatalytic degradation of MO and MB by Bi2O3–RGO is investigated.•High MO and MB degradation rates are achieved under visible light irradiation. Bi2O3-reduced graphene oxide (RGO) composites were successfully synthesized via microwave-assisted reduction of graphite oxide in Bi2O3 precursor solution using a microwave system. Their morphologies, structures, and photocatalytic performance in the degradation of methylene blue (MB) and methyl orange (MO) were characterized by scanning electron microscopy, transmission electron microscopy, X-ray diffraction spectroscopy, UV–vis absorption spectroscopy, and electrochemical impedance spectroscopy, respectively. The results show that the RGO addition can enhance the photocatalytic performance of Bi2O3–RGO composites. Bi2O3–RGO composite with 2 wt.% RGO achieves maximum MO and MB degradation rates of 93% and 96% at 240min under visible light irradiation, respectively, much higher than those for the pure Bi2O3 (78% and 76%). The enhanced photocatalytic performance is ascribed to the increased light adsorption and the reduction in electron–hole pair recombination in Bi2O3 with the introduction of RGO.
ISSN:0021-9797
1095-7103
DOI:10.1016/j.jcis.2013.07.045