PHOTOCATALYTIC REDUCTION AND IMMOBILIZATION OF HEXAVALENT CHROMIUM ATTITANIUM-DIOXIDE IN AQUEOUS BASIC-MEDIA

Authors
LIN WY WEI C RAJESHWAR K
Citation
Wy. Lin et al., PHOTOCATALYTIC REDUCTION AND IMMOBILIZATION OF HEXAVALENT CHROMIUM ATTITANIUM-DIOXIDE IN AQUEOUS BASIC-MEDIA, Journal of the Electrochemical Society, 140(9), 1993, pp. 2477-2482
Citations number
86
Categorie Soggetti
Electrochemistry
Journal title
Journal of the Electrochemical Society → ACNP
ISSN journal
00134651
Volume
140
Issue
9
Year of publication
1993
Pages
2477 - 2482
Database
ISI
SICI code
0013-4651(1993)140:9<2477:PRAIOH>2.0.ZU;2-O
Abstract
The thermodynamic aspects of the photocatalytic reduction of Cr(VI) at TiO2 are first discussed and contrasted for pH 0 and pH 10 aqueous me dia. The photocorrosion of TiO2 is shown to be thermodynamically less favorable in basic media. A scheme for the one-step removal of Cr(VI) at TiO2 Via its reduction and subsequent immobilization [as Cr(OH)3] i s demonstrated for pH 10 chromate solutions. Dissolved oxygen is shown to inhibit the reduction of Cr(VI). A preliminary kinetics analysis r eveals adherence of the initial rate of Cr(VI) reduction to the simple Langmuir model.