화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.8, No.2, 150-155, March, 2002
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Photocatalytic Decomposition of Bromate over Titanium Dioxides Prepared Using Sol-Gel Method
Seong Soo Hong†, Man Sik Lee, Jun Ho Kim, Byung Hyun Ahn1, Kwon Taek Lim2, and Gun Dae Lee
  • Materials Science and Engineering, Pukyong National University, Nam-ku, Pusan 608-739, Korea
  • 1Division of Chemical Engineering, Pukyong National University, Nam-ku, Pusan 608-739, Korea
  • 2Image and Information Engineering, Pukyong National University, Nam-ku, Pusan 608-739, Korea
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The photocatalytic decomposition of bromate ions was carried out over various titanium dioxides prepared using the sol-gel method from titanium isopropoxide with different R ratios (H2O/titanium isopropoxide) and calcination temperatures. All the titanium dioxides were characterized by XRD, a BET surface area analyzer, and UV-DRS. The effect of the reaction conditions, such as the initial concentration of the reactants, catalyst weight, and initial pH of the solution on the photocatalytic activity was also studied. The titanium dioxide prepared with a R ratio of 75 and calcined at 700℃ exhibited the highest activity in the photocatalytic decomposition of bromate. The photocatalytic decomposition of bromate showed a pseudo-1st order reaction, plus the decomposition rate increased with a decrease in the initial bromate concentration and exhibited a maximum value with a pH 7 solution. Accordingly, it would appear that the decomposition of bromate occurred due to the photogenerated electrons of titania and was unaffected by the oxidant.
Keywords:photocatalytic decomposition of bromate;titanium dioxide;sol-gel method;photogenerated electron
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