Photocatalytic degradation of atrazine by heteropolyoxotungstates
| Autor: | Rami Al-Oweini, Ghassan Younes, Loubna Youssef |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
02 engineering and technology
021001 nanoscience & nanotechnology 01 natural sciences 010305 fluids & plasmas photocatalysts chemistry.chemical_compound herbicides chemistry Environmental chemistry 0103 physical sciences Degradation (geology) polyoxometalates Atrazine lcsh:Science (General) 0210 nano-technology Photocatalytic degradation metabolites degradation atrazine lcsh:Q1-390 |
| Zdroj: | Journal of Taibah University for Science, Vol 13, Iss 1, Pp 274-279 (2019) |
| ISSN: | 1658-3655 |
| Popis: | An elegant and eco-friendly photocatalytic degradation approach for the most commonly used herbicide, Atrazine (ATZ); allowed a selective and partial degradation into atrazine-2-hydroxy (Hydroxyatrazine, HAT), which was the sole obtained metabolite. The effect of tungstosilicates and tungstophosphates as photocatalysts under 60 min UV irradiation at two different wavelengths; 254 and 366 nm; was investigated by measuring the absorbance at 10-min intervals, using 720-UV spectrophotometry. ATZ conversion rate was the highest when irradiating with the higher-energy 254 nm UV light. This resulted into 54% degradation in the presence of the silicon-based α-Keggin dodecatungstosilicate [α-SiW12O40]4−, whereas 17% was decomposed in its absence. The nature of the heteroatom as well as the structural type of the studied polyoxometalates had a significant effect on the degradation percentage. Accordingly, 31% of ATZ was only decomposed in presence of the phosphorus-analogue [α-PW12O40]4− whereas the cyclic super-lacunary octatetracontatungstooctaphosphate [P8W48O184]40− increased the degradation to 41%. |
| Databáze: | OpenAIRE |
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