Fe/TiO2/pH interactions in solar degradation of imidacloprid with TiO2/SiO2 photocatalysts at pilot-plant scale

Marugán, Javier, López-Muñoz, María-José, Gernjak, Wolfgang and Malato, Sixto (2006) Fe/TiO2/pH interactions in solar degradation of imidacloprid with TiO2/SiO2 photocatalysts at pilot-plant scale. Industrial and Engineering Chemistry Research, 45 26: 8900-8908. doi:10.1021/ie061033b


Author Marugán, Javier
López-Muñoz, María-José
Gernjak, Wolfgang
Malato, Sixto
Title Fe/TiO2/pH interactions in solar degradation of imidacloprid with TiO2/SiO2 photocatalysts at pilot-plant scale
Formatted title
Fe/TiO2/pH interactions in solar degradation of imidacloprid with TiO2/SiO2 photocatalysts at pilot-plant scale
Journal name Industrial and Engineering Chemistry Research   Check publisher's open access policy
ISSN 0888-5885
1520-5045
Publication date 2006-11-11
Sub-type Article (original research)
DOI 10.1021/ie061033b
Volume 45
Issue 26
Start page 8900
End page 8908
Total pages 9
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Language eng
Subject 090409 Wastewater Treatment Processes
Abstract This work focused on determining iron, TiO2, and pH interaction in the photocatalytic oxidation of the pesticide imidacloprid with TiO2/SiO2 catalysts at pilot-plant scale when TiO2/SiO2, iron and H2O2 are combined. Experimental design techniques have been applied to achieve this goal. The response variable in the mathematical model that best fits the results is the initial reaction rate logarithm as a function of the linear effect of the three variables, the interaction between iron dose and pH, and the quadratic effect of pH and titanium dioxide concentration. The analysis of the results shows that the pH is the most influential variable, followed by the initially added dose of iron, and finally TiO2 concentration. The degradation reaction rates observed are the result of the simultaneous combination of a large number of homogeneous and heterogeneous catalytic reactions related to TiO2 and homogeneous photo-Fenton photocatalytic mechanisms. At acid pH, the influence of the semiconductor-based pathway is quantitatively lower than that of degradation by photo-Fenton. However, above a critical pH, a synergistic effect between iron and TiO2 degradation mechanisms is observed, increasing the overall reaction rate.
Keyword Waste-water treatment
Advanced oxidation processes
Hydrogen-peroxide
Photo-Fenton
Imperative technologies
Experimental-designs
TIO2
Light
Decolorization
Pesticides
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

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, 22:57:28 EST by Ms Karen Naughton on behalf of Advanced Water Management Centre