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-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).
Chang
Chen-Yu
CY
Department of Life Science, Ming-Dao University, Peetow, Chang-Hua County, Chinese Taiwan. cychang@mdu.edu.tw
Hsieh
Yung-Hsu
YH
Cheng
Kai-Yuan
KY
Hsieh
Ling-Ling
LL
Cheng
Ta-Chih
TC
Yao
Kuo-Shan
KS
D006861:Hydrogen Peroxide / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017665:Hydroxyl Radical / Q000737:chemistry*; D007501:Iron / Q000737:chemistry*; D020156:Salicylic Acid / Q000737:chemistry*
C045076:Fenton's reagent; D017665:Hydroxyl Radical; D006861:Hydrogen Peroxide; D007501:Iron; D020156:Salicylic Acid