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Remediation of soil polluted with herbicides by Fenton-like reaction: Kinetic model of diuron degradation

Paper ID Volume ID Publish Year Pages File Format Full-Text
45358 46410 2014 9 PDF Available
Title
Remediation of soil polluted with herbicides by Fenton-like reaction: Kinetic model of diuron degradation
Abstract

•A model considering diuron desorption and oxidation by Fenton like is proposed.•Chelant keeps Fe in solution at pH ≈ 7, reducing H2O2 decomposition in aqueous phase.•Diuron oxidation takes place at both aqueous and soil phases.

Catalytic diuron degradation in soil by modified Fenton or Fenton-like reaction has been studied and a kinetic model including the rates of all physical and chemical processes involved in both aqueous and soil phases has been developed and validated.The soil selected, a sandy clay loam one, was artificially spiked with a solution of diuron dissolved in methanol, obtaining a final diuron concentration of 0.167 mmol kg−1. Diuron oxidation experiments were performed in a batch reactor in both aqueous phase and slurry system at different concentrations of H2O2, trisodium citrate (CT) as chelant, and Fe(III) as catalyst.Because of the neutral pH achieved by adding CT, the oxidation rate of CT and H2O2 decomposition in the aqueous phase has been found negligible. On the contrary, a significant unproductive decomposition of H2O2 by the soil was observed. Diuron oxidation rate was strongly dependent on the iron concentration and, in lower extent, on the H2O2 concentration, in both aqueous phase and slurry system.A kinetic model, including diuron desorption, CT adsorption, H2O2 decomposition by soil, and diuron oxidation in both soil and aqueous phase was proposed. The kinetic parameters were obtained by fitting the experimental data to this model. The predicted values of diuron abatement, in both soil and aqueous phases, and the H2O2 simulated conversion values were in good agreement with the experimental ones. Moreover, the obtained results suggest that kinetic of diuron desorption to the aqueous phase was enhanced due to the chemical reaction.

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Keywords
Diuron; Trisodium citrate; Kinetic model; Modified-fenton; Soil remediation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 144, January 2014, Pages 252–260
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us