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《Environmental Chemistry》 2013-09
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Preparation and visible-light photocatalytic degradation activity of bismuth molybdate composite

LI Xinyu;FANG Yanfen;XIONG Shiwei;JIA Manke;HUANG Yingping;China Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University;  
Bismuth Molybdate composite photocatalysts(Bi3.64Mo0.36O6.55 / Bi2MoO6) were prepared in the presence of surfactant PEG6000 using the amild hydrothermal treatment method.The prepared catalysts were named as BMO-0,BMO-1,BMO-2,BMO-3,BMO-4,corresponding the surfactant dosage of 0,10,20,30 and 40 g·L-1.The materials were characterized by X-ray diffraction,scanning electron microscopy,ultravioletvisible diffuse reflectance spectroscopy and BET surface area analyzer.It showed that the composite was consisted of cubic Bi3.64Mo0.36O6.55 nanoparticles and orthorhombic Bi2MoO6 nanoplates.Under visible light the photocatalytic degradation reaction of the Rhodamine B(RhB) and phenol was used to evaluate the photocatalytic activity of Bi3.64Mo0.36O6.55 / Bi2MoO6.The effect of PEG6000 dosage was also investigated.It was indicated BMO-2 had the highest photocatalytic activity in the presence of 20 g·L-1PEG6000.Under visible light irradiation,RhB was completey degraded within 2.5 h,and 35.15% phenol was be degraded within 12 h using BMO-2.To determine the degradation mechanism,the intermedrate product H2O2 was detected by horseradish peroxidase spectro-photometry during the oxidative process.Radical trapping experiments with tertiary butanol and potassium iodide(KI) were also carried out.A possible oxidation mechanism involving the valence band hole and O·2 was propsed for the Bismuth Molybdate composite photocatalytic system.
【Fund】: 国家自然科学基金(20877048 21177072 21207079);; 湖北省创新群体项目(2009CDA020);; 湖北省高等学校优秀中青年科技创新团队计划(T200703)资助;; 三峡大学人才科研启动基金(KJ2011B074);; 三峡大学研究生创新基金(2012CX079)资助
【CateGory Index】: O643.36
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