Solar photocatalytic degradation of dichloroacetic acid with silica-supported titania at pilot-plant scale

Marugán, Javier, Aguado, Jose, Gernjak, Wolfgang and Malato, Sixto (2007) Solar photocatalytic degradation of dichloroacetic acid with silica-supported titania at pilot-plant scale. Catalysis Today, 129 1-2: 59-68. doi:10.1016/j.cattod.2007.06.054


Author Marugán, Javier
Aguado, Jose
Gernjak, Wolfgang
Malato, Sixto
Title Solar photocatalytic degradation of dichloroacetic acid with silica-supported titania at pilot-plant scale
Journal name Catalysis Today   Check publisher's open access policy
ISSN 0920-5861
Publication date 2007-11-15
Year available 2007
Sub-type Article (original research)
DOI 10.1016/j.cattod.2007.06.054
Volume 129
Issue 1-2
Start page 59
End page 68
Total pages 10
Place of publication Amsterdam
Publisher Elsevier Science Publishers
Language eng
Subject 090409 Wastewater Treatment Processes
Abstract A multivariate analysis using experimental design techniques was performed to determine the effect of iron, hydrogen peroxide and titanium dioxide in the solar photodegradation of dichloroacetic acid in a combined TiO2/photo-Fenton process. The study was carried out at pilot-plant scale, using TiO2 supported on silica as the heterogeneous photocatalyst to facilitate separation of the solids after the reaction, and iron concentrations of less than 3 mg L−1 to avoid removal of iron from the effluent. The results show that iron is the most important factor influencing the reaction rate, which suggests that in strongly acidic solutions, the Fenton mechanism controls the process even at such low iron concentrations. Under these conditions, the expected synergism between TiO2 and iron degradation pathways seems to be negligible compared to the antagonistic effect between hydrogen peroxide and TiO2, which reduces the activity of the combined system. However, in the absence of hydrogen peroxide, the activity achieved by the combined Fe/TiO2 system is similar to that of the photo-Fenton process, with the advantage that H2O2 is replaced by a reusable TiO2-based catalytic material. Consequently, the analysis of pilot-plant operation economics took not only the degradation rate, but also the cost of chemicals into account
Keyword Photocatalysis
Photo-Fenton
Supported titania
Dichloroacetic acid
Experimental design
Optimization
Economic analysis
Q-Index Code C1

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Advanced Water Management Centre Publications
 
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Created: Thu, 15 Jan 2009, 12:34:30 EST by Ms Lynette Adams on behalf of Advanced Water Management Centre