Title of article :
ENHANCEMENT OF 4-NITROPHENOL OZONATION IN WATER BY NANO ZnO CATALYST
Author/Authors :
Tabatabaei، M نويسنده Department of Chemistry, Ahar Branch , Islamic Azad University, Ahar, Iran , , Dastmalchi، S نويسنده Biotechnology Research Center and School of Pharmacy, Tabriz University of Medical Science,Tabriz,Iran , , Mehrizad، A نويسنده Department of Chemistry, Science and Research Branch, Islamic Azad University, Tabriz, Ira , , Gharbani، P نويسنده Department of Chemistry, Ahar Branch , Islamic Azad University, Ahar, Iran ,
Issue Information :
ماهنامه با شماره پیاپی سال 2011
Pages :
10
From page :
333
To page :
342
Abstract :
The removal of 4-nitrophenol (4NP) from aqueous solution by ozone combined with nano-ZnO was investigated in a laboratory-scale reactor in which pH of solution, ZnO dosage and initial 4-nitrophenol concentration were considered as variables. The degradation of 4-nitrophenol was determined using UV-Vis and HPLC methods. Interestingly, the degradation of 4-nitrophenol was high under acidic condition where the degradation was about 93% at initial phenol solution pH=3. It was due to aggregation of nano-ZnO particles above pH=6.5. This result was different from the case of ozonation alone, in which higher pH had positive effect on the degradation of 4-nitrophenol due to the formation of hydroxyl radical. As expected, degradation efficiency increased by increasing the nano ZnO dosage and initial 4-nitrophenol concentration. It was found that the nanosized ZnO enhanced the degradation of ozone and the catalytic ozonation enhanced the degradation of 4-nitrophenol on the surface of the nanosized ZnO. In addition, the degree of degradation was also determined indirectly through Total Organic Carbon (TOC) of the samples. Carbon mineralization of 4-nitrophenol was obtained as 13.68% and 60.34% during ozonation and nano-ZnO catalytic ozonation, respectively, after 30 min reaction, proving that combined ozonation and nano-ZnO for reduction of TOC is more efficient. Also a high degree of nitrogen mineralization during catalytic ozonation was achieved at pH= 3 (7.61mg/L).
Journal title :
Iranian Journal of Environmental Health Science and Engineering (IJEHSE)
Serial Year :
2011
Journal title :
Iranian Journal of Environmental Health Science and Engineering (IJEHSE)
Record number :
1341041
Link To Document :
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