| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 9674159 | Journal of Hazardous Materials | 2005 | 6 Pages |
Abstract
Immobilized titania (TiO2) batch reactors reduced hexavalent chromium (Cr(VI)) in the form of potassium dichromate (K2Cr2O7) to trivalent chromium (Cr(III)) in aqueous solution at pH 3 under 171Â W/m2 light intensity. The light source was a 125-W ultraviolet (UV) lamp. The Cr(VI) reduction showed zero-order kinetics (k0), while the Cr(VI) adsorption fitted with first-order kinetics (k1st). Adsorption capacity increased with increasing initial Cr(VI) concentration, and the area of immobilized TiO2 limited the reduction efficiency. The lifetime of fresh immobilized TiO2 was approximately 14Â h. In addition, the regeneration of TiO2 with 3Â M sodium hydroxide (NaOH) was necessary to improve adsorption reaction.
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Authors
Seree Tuprakay, Winai Liengcharernsit,