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http://nopr.niscpr.res.in/handle/123456789/30883| Title: | TiO2-catalysed photodegradation of reactive orange 84 and alizarin red S biological stain |
| Authors: | Rao, N N Dube, Sangeeta |
| Issue Date: | Jan-1997 |
| Publisher: | NISCAIR-CSIR, India |
| Abstract: | Photocatalytic (TiO2/UV)
degradation of Reactive Orange 84 azo dye effluent (RO 84) and
Alizarin Red S (ARS) has been examined using TiO2. catalyst either
as slurry in aqueous dye solution or supported on Ti sheet or polyester fabric.
The supported forms of catalysts have been used for treating larger volume of
RO 84 effluent. Spectrophotometric data on photo reacted dye solutions have
suggested that azo group of RO 84 and quinoid moiety in ARS are affected by
photocatalytic process at the onset. Complete colour bleaching occurred within
30 min to 2 h depending upon the initial concentration of the dyes, and  90% chemical oxygen demand
(COD) removal efficiency could be attained using suspended TiO2 in
4-6 h of exposure to UV light. The rates of photodegradation of these dyes have
shown pseudo-first-order dependence on the concentration of these dyes (≤ 100
ppm). The rate of photodegradation of RO 84 with the supported forms of TiO2
catalysts is about an order of magnitude lower. The photodegradation of ARS dye
has exhibited remarkable dependence on pH while that of RO 84 remained
unaffected. This work suggests that TiO2/UV technique can he
employed for removing colour and COD of dye-house effluents. |
| Page(s): | 1-6 |
| ISSN: | 0975-0991 (Online); 0971-457X (Print) |
| Appears in Collections: | IJCT Vol.04(1) [January 1997] |
Files in This Item:
| File | Description | Size | Format | |
|---|---|---|---|---|
| IJCT 4(1) 1-6.pdf | 1.76 MB | Adobe PDF | View/Open |
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