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Preparation of Bismuth Oxide Quantum Dots and their Photocatalytic Activity in a Homogeneous System
Author(s) -
Zhang Hua,
Wu Ping,
Li Yan,
Liao Lifang,
Fang Zheng,
Zhong Xinhua
Publication year - 2010
Publication title -
chemcatchem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.497
H-Index - 106
eISSN - 1867-3899
pISSN - 1867-3880
DOI - 10.1002/cctc.201000090
Subject(s) - photocatalysis , quantum dot , crystallinity , materials science , methyl orange , chemical engineering , transmission electron microscopy , bismuth , oxide , colloid , electron transfer , graphene , degradation (telecommunications) , phase (matter) , nanotechnology , photochemistry , chemistry , catalysis , organic chemistry , composite material , telecommunications , computer science , engineering , metallurgy
Colloidal oil‐soluble Bi 2 O 3 quantum dots (QDs) are synthesized through an alcoholysis route in organic media. Water‐soluble Bi 2 O 3 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 Bi 2 O 3 QDs exhibit excellent photocatalytic activity for the degradation of methyl orange at a wide range of pH values. After several cycles, the Bi 2 O 3 QDs retain high degradation efficiency. Simulation according to the first‐order reaction dynamics indicates that the degradation reaction may follow complicated quasi‐homogeneous photocatalysis.