کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
580034 | 1453148 | 2010 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Study on the mechanism of photo-degradation of p-nitrophenol exposed to 254Â nm UV light
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
بهداشت و امنیت شیمی
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چکیده انگلیسی
The degradation mechanism of p-nitrophenol (p-NP) exposed to 254Â nm UV light was studied in the presence and the absence of oxygen respectively via both steady-state photolysis and time-resolved laser flash photolysis (LFP) experiments. It has been confirmed that p-NP can be photo-ionized to produce its radical cation (p-NP+) and hydrated electron (eaqâ) with a quantum yield of 0.52. In neutral solution p-NP+ will be quickly deprotonated to form its phenoxyl radical (p-NP) which will react with oxygen to promote the breakage of benzene ring of p-NP. The degradation efficiency of p-NP exposed to 254Â nm UV is as low as commonly reported. However, oxygen could improve the photo-degradation efficiency, which is due to the reaction of oxygen with p-NP. The reaction between oxygen and p-NP has been experimentally confirmed both in LFP and in pulse radiolysis.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Hazardous Materials - Volume 180, Issues 1â3, 15 August 2010, Pages 86-90
Journal: Journal of Hazardous Materials - Volume 180, Issues 1â3, 15 August 2010, Pages 86-90
نویسندگان
Sufang Zhao, Hongjuan Ma, Min Wang, Changqing Cao, Jie Xiong, Yunshu Xu, Side Yao,