skip to main content
Show Results with:

Solar photocatalitycal treatment of carbofuran at lab and pilot scale: Effect of classical parameters, evaluation of the toxicity and analysis of organic by-products

Journal of Hazardous Materials, 2011, Vol.191(1), pp.196-203 [Peer Reviewed Journal]

No full-text

View all versions
  • Title:
    Solar photocatalitycal treatment of carbofuran at lab and pilot scale: Effect of classical parameters, evaluation of the toxicity and analysis of organic by-products
  • Author: Lopez-Alvarez, Blady ; Torres-Palma, Ricardo A. ; Peñuela, Gustavo
  • Found In: Journal of Hazardous Materials, 2011, Vol.191(1), pp.196-203 [Peer Reviewed Journal]
  • Subjects: Carbofuran ; Furadan ; Tio 2 Photocatalysis ; Advanced Oxidation Processes ; Pesticide ; Water Treatment
  • Language: English
  • Description: Highlights ► TiO 2 photocatalytical degradation of pesticide carbofuran in water, at lab and pilot scale, was studied. ► Effect of carbofuran, TiO 2 concentration and pH were evaluated and optimized using the surface response methodology. ► Analysis of five by-products and evaluation of the treatment in presence of isopropanol or acetonitrile suggest that the degradation is carried out by OH radical attack. ► Pilot test indicated that solar TiO 2 photocatalysis is able to completely degrade the pesticide and considerably reduce the toxicity of the solution. In this work the TiO 2 solar-photocatalytical degradation of the pesticide carbofuran (CBF) in water, at lab and pilot scale, was studied. At lab scale the evaluation of CBF concentration (14–282 μmol L −1) showed that the system followed a Langmuir–Hinshelwood kinetics type. TiO 2 concentration (0.05–2 g L −1) and initial pH (3–9) were also evaluated and optimized using the surface response methodology and the Pareto diagram. In the range of variables studied, initial pH 7.60 and 1.43 g L −1 of TiO 2 favoured the efficiency of the process. Under optimal conditions the evolution of substrate, chemical oxygen demand, dissolved organic carbon, toxicity and organics by-products were evaluated. In the pilot scale tests, using direct sunlight, 55 mg L −1 of CBF in a commercial formulation was eliminated after 420 min; while after 900 min of treatment 80% of toxicity (1/ E 50 on Vibrium Fischeri), 80% of chemical oxygen demand and 60% of dissolved organic carbon were removed. The analysis and evolution of five CBF by-products, as well the evaluation of the treatment in the presence of isopropanol or using acetonitrile as a solvent suggest that the degradation is mainly carried out by OH radical attack. Finally, a schema depicting the main degradation pathway is proposed.
  • Identifier: ISSN: 0304-3894 ; DOI: 10.1016/j.jhazmat.2011.04.060

Searching Remote Databases, Please Wait