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Goethite (α-FeOOH) photocatalytic activity at natural concentrations by the addition of H 2 O 2 at neutral pH and the simultaneous presence of fluoride and bicarbonate.
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  • Julián A. Rengifo-Herrera,
  • John J. Alvear-Daza,
  • Janeth Sanabria,
  • Victor A. Castaño-Rodriguez,
  • Alejandra Correa-Betancourt,
  • Silvia Binet,
  • Francisco H. Sánchez,
  • Guillermo A. Muñoz-Medina,
  • Héctor M. Gutiérrez-Zapata,
  • Luis R. Pizzio
Julián A. Rengifo-Herrera
Universidad Nacional de la Plata Facultad de Ciencias Exactas

Corresponding Author:julianregifo@quimica.unlp.edu.ar

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John J. Alvear-Daza
Universidad Nacional de la Plata Facultad de Ciencias Exactas
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Janeth Sanabria
Universidad del Valle
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Victor A. Castaño-Rodriguez
Universidad del Valle
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Alejandra Correa-Betancourt
Programa de Procesos de Fabrica
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Silvia Binet
Ecole polytechnique federale de Lausanne Institut des Sciences et Ingenierie Chimiques
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Francisco H. Sánchez
Instituto de Fisica La Plata
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Guillermo A. Muñoz-Medina
Instituto de Fisica La Plata
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Héctor M. Gutiérrez-Zapata
Universidad del Valle
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Luis R. Pizzio
Universidad Nacional de la Plata Facultad de Ciencias Exactas
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Abstract

The effect of the simultaneous presence of fluorine (0.15-1.2 mg L -1), bicarbonates (83.6-596 mg L -1), and synthesized goethite (0.3 mg L -1) at typical concentrations often found in natural groundwater samples was evaluated on the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) at pH 6.9 under simulated sunlight irradiation (300 W m -2) and H 2O 2 concentrations of 10 mg L -1. 2,4-D removal was strongly enhanced by the presence of fluoride. F - could modify the surface of iron (hydr)oxide leading to the formation of surficial Fe-F bonds benefiting the formation of free OH radicals, producing upward band bending, reducing the electron-hole recombination, and enhancing the electron transfer to H 2O 2. On the other hand, bicarbonate may react with OH radicals generating CO 3 -• species which could be able to participate in pollutant oxidation as well while solar light-induced H 2O 2 photolysis also played an important role in removing 2,4-D. These findings suggest that “natural” tuning of iron (hydr)oxides by fluoride could take place in natural groundwater generating “natural” photocatalysts with a high activity which could participate, by adding H 2O 2, in the enhancing of sunlight photoinduced natural abiotic processes to pollutants abatement.
09 Mar 2023Submitted to Applied Research
09 Mar 2023Submission Checks Completed
09 Mar 2023Assigned to Editor
14 Mar 2023Reviewer(s) Assigned
03 Apr 2023Review(s) Completed, Editorial Evaluation Pending
10 Apr 2023Editorial Decision: Revise Major
25 Apr 20231st Revision Received
25 Apr 2023Submission Checks Completed
25 Apr 2023Assigned to Editor
28 Apr 2023Reviewer(s) Assigned
13 May 2023Review(s) Completed, Editorial Evaluation Pending
13 May 2023Editorial Decision: Accept