Gallic acid water ozonation using activated carbon

被引:85
作者
Beltrán, FJ [1 ]
García-Araya, JF [1 ]
Giráldez, I [1 ]
机构
[1] Univ Extremadura, Dept Ingn Quim & Energet, Badajoz 06071, Spain
关键词
activated carbon; ozone; gallic acid; ozonation by-products; heterogeneous activated carbon ozonation; water ozonation;
D O I
10.1016/j.apcatb.2005.10.010
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The ozonation of gallic acid in water in the presence of activated carbon has been studied at pH 5. Hydrogen peroxide, ketomalonic and oxalic acids were identified as by-products. The process involves two main periods of reaction. The first period, up to complete disappearance of gallic acid, during which ozonation rates are slightly improved by the presence of activated carbon. The second one, during which activated carbon plays an important role as promoter, and total mineralization of the organic content of the water is achieved. The organic matter removal is due to the sum of contributions of ozone direct reactions and adsorption during the first period and to a free radical mechanism likely involving surface reactions of ozone and hydrogen peroxide on the carbon surface during the second period. There is a third transition period where by-products concentration reach maximum values and ozonation is likely due to both direct and free radical mechanisms involving ozone and adsorption. Discussion on the mechanism and kinetics of the process is also presented both for single ozonation and activated carbon ozonation. (c) 2005 Elsevier B.V. All rights reserved.
引用
收藏
页码:249 / 259
页数:11
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