Details

Autor(en) / Beteiligte

• Zhao, Sufang
• Ma, Hongjuan
• Wang, Min
• Cao, Changqing
• Xiong, Jie
• Xu, Yunshu
• Yao, Side

Titel

Study on the mechanism of photo-degradation of p-nitrophenol exposed to 254 nm UV light

Ist Teil von

• Journal of hazardous materials, 2010-08, Vol.180 (1), p.86-90

Ort / Verlag

Kidlington: Elsevier B.V

Erscheinungsjahr

2010

Link zum Volltext

Quelle

MEDLINE

Beschreibungen/Notizen

• The degradation mechanism of p-nitrophenol (p-NP) exposed to 254 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 (e aq −) 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 254 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.