Benamara, MajdiGómez, ElviraDhahri, RamziSerrà i Ramos, Albert2021-02-032021-02-032021-01-172072-6651https://hdl.handle.net/2445/173612The ZnO-based visible-LED photocatalytic degradation and mineralization of two typical cyanotoxins, microcystin-LR (MC-LR) and anatoxin-A, were examined. Al-doped ZnO nanoparticle photocatalysts, in Al:Zn ratios between 0 and 5 at.%, were prepared via sol-gel method and exhaustively characterized by X-ray diffraction, transmission electron microscopy, UV-vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and nitrogen adsorption-desorption isotherms. With both cyanotoxins, increasing the Al content enhances the degradation kinetics, hence the use of nanoparticles with 5 at.% Al content (A5ZO). The dosage affected both cyanotoxins similarly, and the photocatalytic degradation kinetics improved with photocatalyst concentrations between 0.5 and 1.0 g L-1. Nevertheless, pH study revealed that the chemical state of a species decisively facilitates the mutual interaction of cyanotoxin and photocatalysts. A5ZO nanoparticles achieved better outcomes than other photocatalysts to date, and after 180 min, the mineralization of anatoxin-A was virtually complete in weak alkaline medium, whereas only 45% of MC-LR was in neutral conditions. Moreover, photocatalyst reusability is clear for anatoxin-A, but it is adversely affected for MC-LR.14 p.application/pdfengcc-by (c) Benamara, Majdi et al., 2021http://creativecommons.org/licenses/by/3.0/esFotocatàlisiNanopartículesDíodes electroluminescentsPhotocatalysisNanoparticlesLight emitting diodesinfo:eu-repo/semantics/article7058432021-02-03info:eu-repo/semantics/openAccess33477326