The photocatalytic degradation of 4-chloronitrobenzene (4-CNB) was carried out using Degussa P25 TiO2 as photocatalyst in three different gas atmospheres: nitrogen, oxygen, and ozone. The total organic carbon (TOC) and inorganic anions including chloride, nitrite, and nitrate anions were measured to monitor the mineralization processes, while the degradation of 4-CNB and the formation of intermediates were followed by liquid chromatography–mass spectrometry (LC/MS). Results showed that the photocatalytic efficiency followed the order of TiO2/UV/N2 < TiO2/UV/O2 < TiO2/UV/O3, which was further proved by evaluating the reaction activities using electron paramagnetic resonance (EPR) spin trapping technique. Chlorine atom, nitro group and hydrogen atom of the benzene ring could be displaced by hydroxyl radical (•OH) leading to the formation of chloride, nitrite (III) anions and a variety of phenols, then the nitrite (III) anions were further oxidized to nitrate (V) anions. 4-Nitrophenol and 5-chloro-2-nitrophenol were identified and quantified in both of the TiO2/UV/N2 and TiO2/UV/O2 processes while no aromatic intermediates were monitored in the process of TiO2/UV/O3.
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Research Article|
October 01 2011
Photodegradation of 4-chloronitrobenzene in the presence of aqueous titania suspensions in different gas atmospheres Available to Purchase
Miaomiao Ye;
Miaomiao Ye
1Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China
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Tuqiao Zhang;
Tuqiao Zhang
1Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China
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Zhiwei Zhu;
Zhiwei Zhu
1Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China
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Yan Zhang;
Yan Zhang
1Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China
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Yiping Zhang
1Institute of Municipal Engineering, Zhejiang University, Hangzhou 310058, China
E-mail: [email protected]
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Water Sci Technol (2011) 64 (7): 1466–1472.
Article history
Received:
September 25 2010
Accepted:
January 18 2011
Citation
Miaomiao Ye, Tuqiao Zhang, Zhiwei Zhu, Yan Zhang, Yiping Zhang; Photodegradation of 4-chloronitrobenzene in the presence of aqueous titania suspensions in different gas atmospheres. Water Sci Technol 1 October 2011; 64 (7): 1466–1472. doi: https://doi.org/10.2166/wst.2011.531
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