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Title: | Enhanced photocatalytic removal of cyanotoxins by Al-doped ZnO nanoparticles with visible-LED irradiation |
Author: | Benamara, Majdi Gómez, Elvira Dhahri, Ramzi Serrà i Ramos, Albert |
Keywords: | Fotocatàlisi Nanopartícules Díodes electroluminescents Photocatalysis Nanoparticles Light emitting diodes |
Issue Date: | 17-Jan-2021 |
Publisher: | MDPI |
Abstract: | The 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. |
Note: | Reproducció del document publicat a: https://doi.org/10.3390/toxins13010066 |
It is part of: | Toxins, 2021, vol. 13, num. 1, p. 66 |
URI: | http://hdl.handle.net/2445/173612 |
Related resource: | https://doi.org/10.3390/toxins13010066 |
ISSN: | 2072-6651 |
Appears in Collections: | Articles publicats en revistes (Ciència dels Materials i Química Física) |
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