Mechanistic study of ozonation of p-nitrophenol in aqueous solution
SHI Hui-xiang , XU Xian-wen , XU Xin-hua , WANG Da-hui , WANG Qi-da
DOI:
Received ,Revised , Accepted , Available online
Volume 17,2005,Pages 926-929
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Ozonlysis in the treatment of p-nitrophenol solution was studied in this paper. The results indicated that the decomposition of pnitrophenol was accelerated as the gas flow rate or pH value increased. When gaseous ozone concentration was 20.11 mg/L and pH was 3, after 24 min reaction, the removal rate of p-nitrophenol reached 73.04%, 86. 11%, 91.71 % and 95 % at the gas flow rate of 32, 40, 48and 56 ml/min respectively. And when pH was 3, 4, 5, 6, the decomposition rate was 66.38%, 82.09%, 90.46%, 97.50% after a 20min reaction respectively. It was mainly O3 molecule that took part in the decomposition when pH was 3. The main intermediates during the decomposition include catechol, o-benzoquinone, hydroquinone, p-benzoquinone, phenol, fumaric acid, maleic acid, oxalic acid and formic acid. The decomposition mechanism of p-nitrophenol was also discussed.
