Reaction of inflammation inhibitors with chemically and electrochemically generated hydroxyl radicals

Mineralization of an azo dye Acid Red 14 by photoelectro-Fenton process using an activated carbon fiber cathode

“…In recent years indirect electrooxidation methods with hydrogen peroxide electrogeneration, such as electro-Fenton (EF) and photoelectro-Fenton (PEF) reactions, are being developed for the treatment of toxic and refractory organic pollutants in acid waters . In these environmentally friendly electrochemical techniques, hydrogen peroxide is continuously generated in an acidic contaminated solution from the two-electron reduction of O 2 which takes place on graphite [3][4][5], reticulated vitreous carbon [6][7][8][9], mercury pool [10][11][12], carbon-felt [13][14][15][16][17][18] O 2 -diffusion [19][20][21][22][23][24][25][26][27][28][29] and activated carbon fiber (ACF) [30] cathodes. In acidic aqueous medium the oxidation power will be enhanced by addition of ferrous ions to the solution that allows the production of a very reactive one-electron oxidizing agent hydroxyl radical ( OH) (E8 = 2.8 V/NHE) from the well-known Fenton reaction between both species with a secondorder rate constant k 2 = 53 M À1 s À1 [11].…”

Kinetic study of the degradation/mineralization of aqueous solutions contaminated with Rosuvastatin drug by Electro-Fenton: Influence of experimental parameters

“…These methods have significant remarkable benefits; they are versatile, environmentally friendly, provide better security with simple handling conditions and ensure a high yield [2]. Particular attention is given in recent years to electro-Fenton (EF) process as a technical high performance process based on continuous electrogeneration of H 2 O 2 in acid solution by reduction to 2 electrons of oxygen (reaction 1) to the cathode as mercury pool [38,39], carbon felt CF [40][41][42], activated carbon fiber [43], carbon nanotubes-polytetrafluoroethylene PTFE [44], carbon nanotubes immobilized onto graphite fiber [45], carbon PTFE gas diffusion electrodes GDE [46] …”

Degradation of 2-hydroxybenzoic acid by advanced oxidation processes

“…Indeed, aromatic hydroxylation has been previously used as a method for measuring the production of hydroxyl radicals both in vitro (Halliwell, 1978;Richmond et al, 1981) and in vivo (Halliwell et al, 1987;Grootveld et al, 1986), and this reaction has also been employed in studies involving inflammation inhibitors (Oturan et al, 1992a). In these works, 2-HBA was the most frequently employed organic substrate, as a hydroxyl radical trap.…”

“…Considering the electrophilic character of the hydroxyl radical, the attack of • OH on the o:m:p positions of phenol occurs in the ratio 0.48:0.08:0.36 (Oturan et al, 1992b;Raghavan et al, 1992). Both of the products 2,3-DHBA and 2,5-DHBA have been obtained during 2-HBA oxidation in several works (Oturan et al, 1992a, b;Oturan et al, 1995;Raghavan et al, 1992;Grinstead et al, 1960) employing Fe…”