Heterogeneous Catalytic Ozonation of 2-Chlorophenol in Aqueous Solution
|關鍵字:||異相催化;臭氧化;催化劑;2-氯酚;草酸;礦化;heterogeneous catalytic;ozonation;mineralization;oxalic acid;2-chlorophenol|
The objective of this study is to establish the Heterogeneous Catalytic Ozonation System. It is attempted to combine ozone with the adsorptive and oxidative properties of solid metal oxide catalysts to mineralize dissolved organics at 25℃. 2-Chlorophenol and oxalic acid were selected as the target organics. The influence of catalyst dosages, catalyst species and pH values had been examined. The analysis of reaction rate, mineralization efficiency, ozone consumption and toxicity were carried out during the whole experiment in order to evaluate the performance of this system. Under neutral condition, ozonation in the presence of alumina exhibited the greatest enhancement in mineralizing 2-chlorophenol(from 22% to 43% ). The consumption of ozone was half of the conventional system, and the reduction of toxicity was steadier. In addition, three consecutive runs with the catalyst revealed the log-term stability of the catalyst. Ozonation of oxalic acid aqueous solution in presence of MnO2 supported on alumina under acidic condition revealed the great mineralization efficiency. It is suggested that some of the manganate ions participated in this reaction resulting in the increase in reaction rate.
|Appears in Collections:||Thesis|