The influence of ferrous/ferric ions on the efficiency of photocatalytic oxidation of pollutants in groundwater.
The complex influence of ferrous/ferric ions on the efficiency of aqueous photocatalytic oxidation (PCO) of 2-ethoxyethanol (2-EE), methyl tert-butyl ether (MTBE) and humic substances (HS) was established. A drastic efficiency increase at lower concentration of ferrous/ferric ions was observed to change to a sharp decrease at higher concentrations for 2-EE and MTBE, whereas for HS only an inhibitive effect of Fe2+/3+ on the PCO efficiency was noticed. The authors proposed an explanation for the observed phenomena based on the different sensitivities of pollutants towards radical-oxidation reactions and the competitive adsorption of metallic ions and pollutants on the TiO2 surface.
Klauson
D
D
Department of Chemical Engineering, Tallinn University of Technology, Ehitajate tee 5, Tallinn 19086, Estonia.
Preis
S
S
Portjanskaja
E
E
Kachina
A
A
Krichevskaya
M
M
Kallas
J
J
D002384:Catalysis; D005290:Ferric Compounds / Q000737:chemistry*; D005296:Ferrous Compounds / Q000737:chemistry*; D007477:Ions; D010084:Oxidation-Reduction; D010777:Photochemistry; D014874:Water Pollutants, Chemical
D005290:Ferric Compounds; D005296:Ferrous Compounds; D007477:Ions; D014874:Water Pollutants, Chemical