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Composite photocatalysts for solar water treatment

Advanced Oxidation Processes (AOPs) emerged as feasible alternatives or complements to conventional water treatment processes for treating refractory compounds such as notably the pesticides, that can provoke ecological risks or adverse effects on living organisms even at low concentrations. One of these processes is photocatalysis, which uses light energy from the Sun or from an artificial source powered by renewable electricity, to generate highly oxidizing radicals by means of the activation of a solid semiconductor (the photocatalyst), and thus eliminate by oxidation this type of compounds.

IMDEA Energy has contributed to elucidate the action mode of a new type of photocatalysts based on the combination of lanthanum ferrite and titanium dioxide in variable proportions, in a study led by the University of Strasbourg, published in the Journal of Hazardous Materials.* These photocatalysts are capable of completely eliminating in a few hours, under the action of either artificial UVA light or under simulated sunlight, myclobutanil, one of the pesticides most frequently detected in both surface and groundwater in the Upper Rhine area, in Central Europe.

* P. García-Muñoz, F. Fresno, J. Ivanez, D. Robert, N. Keller, Activity enhancement pathways in LaFeO3@TiO2 heterojunction photocatalysts for visible and solar light driven degradation of myclobutanil pesticide in water. Journal of Hazardous Materials 400 (2020) 123099, https://doi.org/10.1016/j.jhazmat.2020.123099 

More information: Fernando Fresno, Senior Assistant Researcher, Photoactivated Processes Unit. fernando.fresno@imdea.org

Event Date: 
Wednesday, November 25, 2020