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Enhanced Photocatalytic Removal of Cyanotoxins by Al-Doped ZnO Nanoparticles with Visible-LED Irradiation
- Source :
- Toxins, Dipòsit Digital de la UB, Universidad de Barcelona, Toxins, Vol 13, Iss 66, p 66 (2021), Volume 13, Issue 1
- Publication Year :
- 2020
-
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&minus<br />1. Nevertheless, the 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.
- Subjects :
- Photoluminescence
Diffuse reflectance infrared fourier transform
Light
Microcystins
Photochemistry
LEDs
Health, Toxicology and Mutagenesis
Kinetics
Fotocatàlisi
Nanoparticle
lcsh:Medicine
Metal Nanoparticles
02 engineering and technology
010402 general chemistry
Toxicology
01 natural sciences
Catalysis
Article
cyanotoxins
Photocatalysis
visible light
Díodes electroluminescents
anatoxin-(a)
Photolysis
Nanopartícules
Cyanobacteria Toxins
microcystin-LR
Chemistry
lcsh:R
Mineralization (soil science)
Hydrogen-Ion Concentration
021001 nanoscience & nanotechnology
Photochemical Processes
Light emitting diodes
0104 chemical sciences
Chemical state
Nanoparticles
Marine Toxins
ZnO-doped nanoparticles
Zinc Oxide
0210 nano-technology
photocatalysis
Water Pollutants, Chemical
Visible spectrum
Nuclear chemistry
Aluminum
Tropanes
Subjects
Details
- ISSN :
- 20726651
- Volume :
- 13
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Toxins
- Accession number :
- edsair.doi.dedup.....ce749b332b22cf94973dcbb30b48c2bc