Research on Morphological Control of Nanocrystalline Photocatalyst
Date Issued
2005
Date
2005
Author(s)
Peng, Cheng-Chun
DOI
en-US
Abstract
TiO2 crystallites were synthesized by a solution chemistry process consisting of a sol-gel step followed by hydrothermal treatment at 180oC, and the effect of additives, including some commonly used surfactants, organic or inorganic acids and bases, on the morphology of crystallites were investigated. Excess chloride or citrate ions in acidic condition tend to retard the grain growth rate by undue adsorption to the crystallite surfaces, resulting in equidimensionl particles; certain organic acids (formic, acetic and benzoic acid) and surfactants (PVP, CTAB) displayed similar influences on the morphology of synthesized crystallites.
However, the growth rates along different lattice directions tend to differ in some basic conditions, leading to elongated crystallites. With increasing NH3 content from [NH3/Ti] = 0 to 50, TiO2 crystallites were increasingly elongated along <001> to form crystallite having predominantly {110} surface planes. While not significant in methyl orange solution, the surface catalytic activities of the crystallites toward degradation of methyl orange under UV-light (300 nm) illumination was found to increase with increasing {110} plane coverage.
Subjects
二氧化鈦
水熱法
晶貌控制
亞甲基藍
TiO2
Hydrothermal Method
Morphology control
Methylene blue
Type
thesis
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