Kinetics of Catalytic Ozonation of Oxalic Acid in Water with Activated Carbon

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• 作者：Fernando J. Beltrá ; n ; Francisco J. Rivas ; Lidia A. Ferná ; ndez ; Pedro M. Á ; lvarez ; and Ram&oacute ; n Montero-de-Espinosa
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2002
• 出版时间：December 11, 2002
• 年：2002
• 卷：41
• 期：25
• 页码：6510 - 6517
• 全文大小：100K
• 年卷期：v.41,no.25(December 11, 2002)
• ISSN：1520-5045

文摘

The ozonation kinetics of oxalic acid in water in the presence of an activated carbon has beeninvestigated at acid pH. The presence of the activated carbon significantly enhances thedegradation rate of oxalic acid if compared to single ozonation and single adsorption. Accordingto total organic carbon measurements, nearly complete mineralization of oxalic acid can beachieved depending on the experimental conditions. The presence of tert-butyl alcohol, whichscarcely adsorbs on the carbon surface at the conditions investigated, led to a significant reductionof the oxalic acid removal rate. Consequently, experimental results suggest that the reactionproceeds in the water phase between oxalic acid and oxidant species, likely hydroxyl radicals,coming from the ozone decomposition on the carbon surface. The proposed mechanism yieldeda first-order kinetics with respect to ozone, close to the 0.8 order experimentally observed. Also,the energy of activation was found to be approximately 15 kcal mol^-1.