Effect of pH on Fenton process using estimation of hydroxyl radical with salicylic acid as trapping reagent

This study estimates the yield of hydroxyl radical using salicylic acid as the trapping reagent and investigates the relationship between hydroxyl radical and pH value. The formation and variation of hydroxyl radical under different pH values were evaluated using reaction products, 2,3-DHBA, 2,5-DHB...

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Bibliographic Details
Published in:Water science and technology 2008-01, Vol.58 (4), p.873-879
Main Authors: Chang, Chen-Yu, Hsieh, Yung-Hsu, Cheng, Kai-Yuan, Hsieh, Ling-Ling, Cheng, Ta-Chih, Yao, Kuo-Shan
Format: Article
Language:English
Subjects:
Catechol
Hydrogen peroxide
Hydrogen Peroxide - chemistry
Hydrogen-Ion Concentration
Hydroxyl Radical - chemistry
Hydroxyl radicals
Iron - chemistry
Kinetics
Oxidation
pH effects
Reaction kinetics
Reaction products
Salicylic acid
Salicylic Acid - chemistry
Trapping
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Summary:This study estimates the yield of hydroxyl radical using salicylic acid as the trapping reagent and investigates the relationship between hydroxyl radical and pH value. The formation and variation of hydroxyl radical under different pH values were evaluated using reaction products, 2,3-DHBA, 2,5-DHBA, and catechol. The formation rate of hydroxyl radical was dependent on the ratio of ferrous ion to hydrogen peroxide and pH values. The difference between various pH values was explored. The kinetics and mechanisms of hydroxyl radical reactions were established in the Fenton process. Experimental results showed that the best reaction conditions were 8.5 mM H(2)O(2), 1.25 mM Fe(2 + ), Fe(2 + )/H(2)O(2) = 0.147 at pH 3 and the formation rate constant of hydroxyl radical was 1.12 x 10(11) M(-1) s(-1).
ISSN:0273-1223
1996-9732
DOI:10.2166/wst.2008.429