Ozonation of 1,2-dihydroxybenzene in the presence of activated carbon.
This work aims at obtaining experimental data on ozonation of 1,2-dihydroxybenzene (DHB) in the presence of activated carbon, with a view to assessing possible changes in its surface chemical structure and adsorption capacity. Experiments were conducted in a 0.5 L reactor, loaded with 2 g Filtrasorb 400 granular activated carbon, and 1-5 mM DHB aqueous solution at pH 2-8. Ozone gas was generated with an Ozocav generator, and fed into the reactor for a given exposure time, in the range 0.5-240 min, at 25 degrees C and 1 atm. After each run, liquid and activated carbon samples were taken for chemical assays. Soluble organic groups present on the active carbon surface were desorbed and analysed by GC-MS and HPLC. Activated carbon chemical surface properties were analysed using TPD, FT-IR, and XPS techniques. Reactions between ozone and adsorbed DHB were shown to be fast, leading to formation of C-6, C-4 and C-2 by-products. Oxygenated surface groups, particularly, COOH and C = O, increased as a result of ozonation.
Zaror
C
C
Chemical Engineering Department, University of Concepción, Chile. czaror@merlin.diq.udec.cl
Soto
G
G
Valdés
H
H
Mansilla
H
H
D000327:Adsorption; D002244:Carbon / Q000737:chemistry*; D002396:Catechols / Q000737:chemistry*; D007220:Industrial Waste; D010083:Oxidants, Photochemical / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D013052:Spectrometry, X-Ray Emission; D013696:Temperature
D002396:Catechols; D007220:Industrial Waste; D010083:Oxidants, Photochemical; D010126:Ozone; D002244:Carbon; C034221:catechol