Photocatalytic degradation of wastewater pollutants: titanium dioxide mediated degradation of methyl orange and beta-naphthol orange.
The photocatalytic degradation of azo dyes such as methyl orange and beta-naphthol orange in aqueous suspensions of TiO2 has been investigated under a variety of conditions. The kinetics of degradation was studied under different conditions such as reaction pH, substrate and catalyst concentration, and types of titanium dioxide used and in the presence of electron acceptors and electron donors. The degradation rates of the dyes have been found to be strongly influenced by all the above parameters. Carbon dioxide yield measurements indicate that only partial mineralization occurs in the initial phase of oxidation.
Antharjanam
Sudhadevi
S
Photosicences and Photonics Division, Regional Research Laboratory (CSIR), Trivandrum--695 019, India.
Philip
Robert
R
Suresh
Das
D
D001391:Azo Compounds / Q000737:chemistry*; D001557:Benzenesulfonates / Q000737:chemistry*; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry*; D007202:Indicators and Reagents / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D018508:Water Purification / Q000379:methods*
D001391:Azo Compounds; D001557:Benzenesulfonates; D004396:Coloring Agents; D007202:Indicators and Reagents; C009495:titanium dioxide; C100258:methyl orange; D014025:Titanium; C014722:2-naphthol orange