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Title: Effect of Silver Dispersion on Photocatalytic Activity of Silver-Loaded Titanium Oxide
Authors: Rungnapa Tongpool
Kongthip Setwong
Keywords: photocatalysis
particle size
Issue Date: 2008
Publisher: Faculty of Science, Chiang Mai University
Citation: Chiang Mai Journal of Science 35, 2 (May 2008),274-282
Abstract: The improvement of photocatalytic activity of TiO2 was studied by heat treating the mixtures of silver nitrate solution and three different sizes of TiO2 ; commercial-grade C02 (71 nm), P25 (24 nm) and homemade precipitated TiO2 (pTiO2, 11 nm). The activity toward nitrite degradation of large particles (C02) can be improved to be equal to small particles (P25) by optimum Ag loading. The optimum loading for pTiO2, P25 and C02 were 2.0, 0.75 and 0.75% which corresponded to the Ag contents of 1.35, 0.74 and 0.66%, respectively. Small particles tended to have high, while large particles tended to have low Ag contents as optimum levels. The agglomeration, dispersion and coverage of Ag on each TiO2 type were different and able to change the activity order. The Ag agglomerates on C02 were large and not well diffused while those on P25 were small and diffused homogeneously. As a result, the critical content (minimum Ag content creating measurable Ag agglomerates) of large TiO2 particles was relatively low (C02 = 0.66%) compared to that of the small ones (P25 = 1.24%).
Description: The Chiang Mai Journal of Science is an international English language peer-reviewed journal which is published in open access electronic format 6 times a year in January, March, May, July, September and November by the Faculty of Science, Chiang Mai University. Manuscripts in most areas of science are welcomed except in areas such as agriculture, engineering and medical science which are outside the scope of the Journal. Currently, we focus on manuscripts in biology, chemistry, physics, materials science and environmental science. Papers in mathematics statistics and computer science are also included but should be of an applied nature rather than purely theoretical. Manuscripts describing experiments on humans or animals are required to provide proof that all experiments have been carried out according to the ethical regulations of the respective institutional and/or governmental authorities and this should be clearly stated in the manuscript itself. The Editor reserves the right to reject manuscripts that fail to do so.
ISSN: 2465-3845
Appears in Collections:CMUL: Journal Articles

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