Evidence for the Active Species Involved in the Photodegradation Process of Methyl Orange on TiO2
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- 作者：Wenjuan Li ; Danzhen Li ; Yangming Lin ; Peixian Wang ; Wei Chen ; Xianzhi Fu ; Yu Shao
- 刊名：The Journal of Physical Chemistry C
- 出版年：2012
- 出版时间：February 9, 2012
- 年：2012
- 卷：116
- 期：5
- 页码：3552-3560
- 全文大小：472K
- 年卷期：v.116,no.5(February 9, 2012)
- ISSN：1932-7455
文摘
Active species such as holes, electrons, hydroxyl radicals (鈥H), and superoxide radicals (O2鈥⑩€?/sup>) involved in the photodegradation process of methyl orange (MO) over TiO2 photocatalyst were detected by several techniques. Using different types of active species scavengers, the results showed that the MO oxidation was driven mainly by the participation of O2鈥⑩€?/sup>, holes and 鈥H radicals. Characterized by the liquid chromatography/mass spectrometry, the transversion of the degradation products with the light irradiation time was first analyzed. Combined with the measurement of oxidation reduction potential, dissolved oxygen, conductivity, and pH values, the degradation process of MO on TiO2 under the effect of the active species was revealed. This was the first time that electrodes were introduced to track the degradation process in situ, and these parameters would be helpful to explain the degradation processes of other organic pollutants.