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Potential of TiO 2 with Various Au Nanoparticles for Catalyzing Mesotrione Removal from Wastewaters under Sunlight.
- Source :
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Nanomaterials (Basel, Switzerland) [Nanomaterials (Basel)] 2020 Aug 13; Vol. 10 (8). Date of Electronic Publication: 2020 Aug 13. - Publication Year :
- 2020
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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