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Comparison of the solar photocatalytic activity of ZnO-Fe2O3 and ZnO-Fe0 on 2,4-D degradation in a CPC reactor

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Abstract

In this work a comparative study of the catalytic activity of ZnO-Fe2O3 and ZnO-Fe0 0.5 wt% materials was carried out in the degradation of 2,4-dichlorophenoxyacetic acid (2,4-D) as a commercial formulation Hierbamina®, using a compound parabolic collector (CPC) reactor. The catalysts were synthesized by the sol-gel method and characterized by X-ray diffraction, UV-Vis diffuse reflectance spectroscopy, Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy. The textural properties of solids were determined from N2 adsorption isotherms using the Brunauer-Emmett-Teller (BET) method. The incorporation of Fe0 onto ZnO was demonstrated by X-ray photoelectron spectroscopy analysis. The photocatalytic tests were performed at pH 7, using 10 mg L−1 of herbicide and 0.5 g L−1 of catalyst loading. The decay in herbicide concentration was followed by reversed-phase chromatography. A complete degradation of 2,4-D was achieved using ZnO-Fe0 while 47% of herbicide removal was attained with ZnO-Fe2O3 mixed oxide for an accumulated energy QUV ≈ 2 kJ L−1. The removal percentage of total organic carbon (TOC) during the solar photocatalytic process was superior using ZnO-Fe0, achieving 45% compared to the 15% obtained with the mixed oxide catalyst.

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Correspondence to A. Hernández-Ramírez.

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This paper is published as part of the themed issue of contributions from the 8th European Meeting on Solar Chemistry and Photocatalysis: Environmental Applications held in Thessaloniki, Greece, June 2014.

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Maya-Treviño, M.L., Villanueva-Rodríguez, M., Guzmán-Mar, J.L. et al. Comparison of the solar photocatalytic activity of ZnO-Fe2O3 and ZnO-Fe0 on 2,4-D degradation in a CPC reactor. Photochem Photobiol Sci 14, 543–549 (2015). https://doi.org/10.1039/c4pp00274a

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  • DOI: https://doi.org/10.1039/c4pp00274a

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