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Effectiveness of photodecomposition of an azo dye on a novel anatase-phase TiO2 and two commercial photocatalysts in a photocatalytic membrane reactor (PMR)
- Source :
-
Separation & Purification Technology . Oct2008, Vol. 63 Issue 2, p386-391. 6p. - Publication Year :
- 2008
-
Abstract
- Abstract: An application of a newly prepared TiO2 having anatase phase (A-700-1h) for decomposition of azo dye Acid Red 18 (AR18) in a photocatalytic membrane reactor (PMR), coupling photocatalysis and membrane distillation (MD) was investigated. The effectiveness of decomposition of the model dye using two commercially available TiO2 photocatalysts – ST-01 and P25 was also determined in order to compare the results. The A-700-1h catalyst was prepared from a crude amorphous TiO2 obtained directly from the production line (sulfate technology) at the Chemical Factory “Police” (Poland) by calcination for 1h at 700°C in air. The hybrid photocatalysis–MD process was conducted in a laboratory-scale installation with a capillary module equipped with polypropylene membranes. It was found that the initial degradation rate r 0 of AR18 using the A-700-1h catalyst was 49–64% higher than in case of anatase ST-01. Moreover, the effectiveness of decolorization of the dye solution at the A-700-1h loading of 0.5g/dm3 determined on the basis of r 0 value was only ca. 8% lower compared to the value determined for the P25 photocatalyst. Taking into account the composition of permeate it was found that only a small amount of by-products of dye photodecomposition was transported through the MD membrane. Moreover, a complete retention of the model dye was observed. [Copyright &y& Elsevier]
- Subjects :
- *AZO dyes
*MEMBRANE reactors
*BIOREACTORS
*PHOTOCATALYSIS
Subjects
Details
- Language :
- English
- ISSN :
- 13835866
- Volume :
- 63
- Issue :
- 2
- Database :
- Academic Search Index
- Journal :
- Separation & Purification Technology
- Publication Type :
- Academic Journal
- Accession number :
- 34534942
- Full Text :
- https://doi.org/10.1016/j.seppur.2008.05.029