Goethite (α‐FeOOH) photocatalytic activity at natural concentrations by the addition of H2O2 at neutral pH and the simultaneous presence of fluoride and bicarbonate

Author:

Alvear‐Daza John J.1,Sanabria Janeth2,Castaño‐Rodriguez Victor A.2,Correa‐Betancourt Alejandra3,Binet Silvia4,Sánchez Francisco H.5,Muñoz‐Medina Guillermo A.56,Gutiérrez‐Zapata Héctor M.2,Pizzio Luis R.1,Rengifo‐Herrera Julián A.1

Affiliation:

1. Laboratory of Advanced Oxidation Processes and Photocatalysis (LAPh), Centro de Investigación y Desarrollo en Ciencias Aplicadas “Dr. J.J. Ronco” (CINDECA), Departamento de Química, Facultad de Ciencias Exactas UNLP‐CCT La Plata, CONICET Buenos Aires Argentina

2. Environmental Microbiology and Biotechnology Laboratory, Engineering School of Environmental & Natural Resources, Engineering Faculty Universidad del Valle ‐ Sede Meléndez Santiago de Cali Colombia

3. Centro de Investigación de la Caña de Azúcar de Colombia (CENICAÑA), Programa de Procesos de Fábrica Estación Experimental vía Cali‐Florida Cali Colombia

4. Institute of Chemical Sciences and Engineering École Polytechnique Fédérale de Lausanne Lausanne Switzerland

5. Departamento de Física, Instituto de Física La Plata (IFLP‐CONICET), Facultad de Ciencias Exactas Universidad Nacional de La Plata La Plata Argentina

6. Universidad Argentina de la Empresa (UADE) Facultad de Arquitectura y Diseño Buenos Aires Argentina

Abstract

AbstractThe effect of the simultaneous presence of fluoride (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 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 H2O2 concentrations of 10 mg L−1. The 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 surface Fe–F bonds benefiting the formation of free OH, producing upward band bending, reducing the electron‐hole recombination, and enhancing the electron transfer to H2O2. On the other hand, bicarbonate may react with OH generating CO3−• species that could participate in pollutant oxidation, while solar light‐induced H2O2 photolysis also played an important role in removing 2,4‐D. These findings suggest that tuning of iron (hydr)oxides by fluoride could take place in real groundwater, generating photocatalysts with a high activity that could participate, by adding H2O2, in the enhancement of sunlight photoinduced natural abiotic processes for pollutant abatement.

Funder

Universidad Nacional de La Plata

Departamento Administrativo de Ciencia, Tecnología e Innovación

Consejo Nacional de Investigaciones Científicas y Técnicas

Publisher

Wiley

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