Photodegradation of DDT with the photodeposited ferric ion on the TiO2 film.
The photodegradation capability of DDT has been enhanced by Fe/TiO2 film in a photoreactor with UV radiation. The optimal thickness of TiO2 for the DDT photodegradation was 2.94 microm with a 3-time coating, where the first-order rate constant was 0.077 min(-1). The optimal Fe3+(ferric ion) photodeposition amount was estimated as 3.7 x 10(-4) mg mm(-2) corresponding with 0.73 mg Fe3+ (mg TiO2)(-1). Photoremoval rate of DDT increased with an increasing pH value, while the pH value of solution decreased to acidic region during the DDT photodegradation. The photodegradation efficiency was 85% in 20 min with only TiO2 film and increased from 85% up to 96% by the photodeposition of 0.73 mg Fe3+ (mg TiO2)(-1) on TiO2 film as a sensitizer since the band gap energy of Fe2O3 (2.2 eV) is lower than that of TiO2 (3.0 eV).
Jang
Seon-Jung
SJ
Department of Chemical Engineering, Sungkyunkwan University, Suwon 440-746, Republic of Korea.
Kim
Moon-Sun
MS
Kim
Byung-Woo
BW
D001673:Biodegradation, Environmental; D002412:Cations; D003634:DDT / Q000302:isolation & purification / Q000378:metabolism*; D005290:Ferric Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D007700:Kinetics; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
D002412:Cations; D005290:Ferric Compounds; C009495:titanium dioxide; C000499:ferric oxide; D003634:DDT; D014025:Titanium; D007501:Iron