期刊
CHEMCATCHEM
卷 2, 期 9, 页码 1115-1121出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cctc.201000090
关键词
bismuth; colloids; homogeneous catalysis; photocatalysis; quantum dots
资金
- National Natural Science Foundation of China [20771037, 20871047]
- Shuguang Project [06SG33]
- SRFDP [20070251014]
- Fundamental Research Funds for the Central Universities
- Shanghai Institutions of Higher Learning
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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