Affiliations: Department of Environmental Engineering, Zhejiang
University, Hangzhou 310027, China | Environmental Engineering Technology Evaluation Center
of Zhejiang Province, Hangzhou 310012, China | Hangzhou Harmony Trade Go., Ltd, Hangzhou 310009,
China
Abstract: Ozonlysis in the treatment of p-nitrophenol solution was studied in
this paper. The results indicated that the decomposition of p-nitrophenol 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, 48 and 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 20 min reaction
respectively. It was mainly O_3 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.
