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Potential of TiO 2 with Various Au Nanoparticles for Catalyzing Mesotrione Removal from Wastewaters under Sunlight.

Authors :
Šojić Merkulov D
Lazarević M
Djordjevic A
Náfrádi M
Alapi T
Putnik P
Rakočević Z
Novaković M
Miljević B
Bognár S
Abramović B
Source :
Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2020 Aug 13; Vol. 10 (8). Date of Electronic Publication: 2020 Aug 13.
Publication Year :
2020

Abstract

Nowadays, great focus is given to the contamination of surface and groundwater because of the extensive usage of pesticides in agriculture. The improvements of commercial catalyst TiO <subscript>2</subscript> activity using different Au nanoparticles were investigated for mesotrione photocatalytic degradation under simulated sunlight. The selected system was 2.43 × 10 <superscript>-3</superscript> % Au-S-CH <subscript>2</subscript> -CH <subscript>2</subscript> -OH/TiO <subscript>2</subscript> (0.5 g/L) that was studied by transmission electron microscopy and ultraviolet-visible (UV-Vis) spectroscopy. It was found that TiO <subscript>2</subscript> particles size was ~20 nm and ~50 nm, respectively. The Au nanoparticles were below 10 nm and were well distributed within the framework of TiO <subscript>2</subscript> . For 2.43 × 10 <superscript>-3</superscript> % Au-S-CH <subscript>2</subscript> -CH <subscript>2</subscript> -OH/TiO <subscript>2</subscript> (0.5 g/L), band gap energy was 2.45 eV. In comparison to the pure TiO <subscript>2</subscript> , addition of Au nanoparticles generally enhanced photocatalytic removal of mesotrione. By examining the degree of mineralization, it was found that 2.43 × 10 <superscript>-3</superscript> % Au-S-CH <subscript>2</subscript> -CH <subscript>2</subscript> -OH/TiO <subscript>2</subscript> (0.5 g/L) system was the most efficient for the removal of the mesotrione and intermediates. The effect of tert -butanol, NaF and ethylenediaminetetraacetic acid disodium salt on the transformation rate suggested that the relative contribution of various reactive species changed in following order: h <superscript>+</superscript> > <superscript>●</superscript> OH <subscript>ads</subscript> > <superscript>●</superscript> OH <subscript>bulk</subscript> . Finally, several intermediates that were formed during the photocatalytic treatment of mesotrione were identified.

Details

Language :
English
ISSN :
2079-4991
Volume :
10
Issue :
8
Database :
MEDLINE
Journal :
Nanomaterials (Basel, Switzerland)
Publication Type :
Academic Journal
Accession number :
32823509
Full Text :
https://doi.org/10.3390/nano10081591