化学
过氧化氢
超氧化物
无机化学
氧气
光化学
锐钛矿
过氧化物
二氧化钛
催化作用
光催化
核化学
有机化学
化学工程
酶
工程类
作者
Hajime Goto,Yasushi Hanada,Teruhisa Ohno,Michio Matsumura
标识
DOI:10.1016/j.jcat.2004.04.001
摘要
The reduction of molecular oxygen is the counter reaction of most photocatalytic reactions proceeding oxidatively on titanium dioxide particles. We have quantitatively analyzed the reductive production of hydrogen peroxide and superoxide ion from oxygen in an aqueous solution containing 2-propanol as the scavenger of positive holes. The rates for the production of hydrogen peroxide and superoxide ion were determined by colorimetry using iodide and nitroblue tetrazolium, respectively. In addition, the oxidation of 2-propanol to acetone was monitored. Based on a comparison of these production rates, it was concluded that the main product from oxygen is hydrogen peroxide when TiO2 powder consisting mainly of anatase-form particles is used, whereas the main product is superoxide ion when TiO2 powder consisting mainly of rutile-form particles is used. The difference in the photocatalytic activity between these powders can be attributed to the difference between the reduction paths of oxygen on these powders. It was also found that the superoxide ion generated from molecular oxygen spontaneously reacts with 2-propanol to produce acetone and hydrogen peroxide.
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