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Preparation of Bismuth Oxide Quantum Dots and their Photocatalytic Activity in a Homogeneous System

Authors

  • Prof. Hua Zhang,

    1. Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-6425-0281
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  • Ping Wu,

    1. Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-6425-0281
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  • Yan Li,

    1. Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-6425-0281
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  • Lifang Liao,

    1. Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-6425-0281
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  • Zheng Fang,

    1. Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-6425-0281
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  • Prof. Xinhua Zhong

    1. Key Laboratory for Advanced Materials, Department of Chemistry, East China University of Science and Technology, Shanghai 200237 (P. R. China), Fax: (+86) 21-6425-0281
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Abstract

Colloidal oil-soluble Bi2O3 quantum dots (QDs) are synthesized through an alcoholysis route in organic media. Water-soluble Bi2O3 QDs are then obtained from the initial oil-soluble QDs through phase transfer by surface modification with mercaptopropionic acid. X-ray diffraction and transmission electron microscopy studies show that the crystallinity is enhanced and particles grow larger after phase transfer. The water-soluble Bi2O3 QDs exhibit excellent photocatalytic activity for the degradation of methyl orange at a wide range of pH values. After several cycles, the Bi2O3 QDs retain high degradation efficiency. Simulation according to the first-order reaction dynamics indicates that the degradation reaction may follow complicated quasi-homogeneous photocatalysis.

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