Hydrothermal synthesis of titanium dioxide using acidic peptizing agents and their photocatalytic activity |
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Authors: | Jun Ho Kim Byung Ho Noh Gun-Dae Lee Seong-Soo Hong |
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Affiliation: | (1) Division of Applied Chemical Engineering, Pukyong National University, 100 Yongdang-dong, Nam-ku, 608-739 Busan, Korea |
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Abstract: | We have prepared TiO2 nanoparticles by the hydrolysis of titanium tetraisopropoxide (TTIP) using HNO3 as a peptizing agent in the hydrothermal method. The physical properties of nanosized TiO2 have been investigated by TEM, XRD and FT-IR. The photocatalytic degradation of orange II has been studied by using a batch
reactor in the presence of UV light. When the molar ratio of HNO3/TTIP was 1.0, the rutile phase appeared on the titania and the photocatalytic activity decreased with an increase of HNO3 concentration. The crystallite size of the anatase phase increased from 6.6 to 24.2 nm as the calcination temperature increased
from 300 °C to 600 °C. The highest activity on the photocatalytic decomposition of orange II was obtained with titania particles
dried at 105 °C without a calcination and the photocatalytic activity decreased with increasing the calcination temperature.
In addition, the titania particles prepared at 180 °C showed the highest activity on the photocatalytic decomposition of orange
II.
This paper was prepared at the 2004 Korea/Japan/Taiwan Chemical Engineering Conference held at Busan, Korea between November
3 and 4, 2004. |
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Keywords: | Nanosized Titania Hydrothermal Method Peptizing Agent HNO3 Photocatalytic Degradation of Orange II |
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