1. Sonocatalytic degradation of fluoroquinolone compounds of levofloxacin using titanium and zirconium oxides nanostructures supported on paper sludge/wheat husk-derived biochar.
- Author
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Motlagh, Parisa Yekan, Soltani, Reza Darvishi Cheshmeh, Pesaran, Zoha, Akay, Sema, Kayan, Berkant, Yoon, Yeojoon, and Khataee, Alireza
- Subjects
ZIRCONIUM oxide ,FLUOROQUINOLONES ,TITANIUM oxides ,BIOCHAR ,WHEAT - Abstract
Sonocatalytic reaction mechanism of BC-TiO 2 and BC-ZrO 2 nanocomposites for degradation of LEV. [Display omitted] • Ultrasound-based degradation of LEV investigated with TiO 2 and ZrO 2 nano-catalysts. • Nano-catalysts were supported on paper sludge- and wheat husk-based biochar (BC). • BC-TiO 2 led to lower degradation efficiency than BC-ZrO 2 within 60 min of reaction. • The opposite trend was observed for a reaction time of 120 min. • Isopropanol substantially inhibited the sonocatalytic degradation of LEV. The present study aimed at treating a water medium containing pharmaceutical compounds such as levofloxacin (LEV). For this purpose, ultrasound (US)-based degradation of LEV was catalyzed by TiO 2 and ZrO 2 nano-catalysts supported on biochar (BC). BC was obtained from a precursor composite of paper sludge and wheat husk. The application of BC-ZrO 2 led to a degradation efficiency of 54.65% within 60 min. When BC-TiO 2 was used, a lower degradation efficiency of 49.62% was obtained at the same reaction time. However, increasing the time to 120 min improved the sonocatalytic degradation of LEV by BC-TiO 2 (72.88%) compared to that of BC-ZrO 2 (66.42%). In the presence of H 2 O 2 and S 2 O 8
2− , the LEV degradation efficiency of US/BC-TiO 2 increased from 72.88% to 87.98% and 94.03%, respectively, and for the US/BC-ZrO 2 process, it increased from 66.42% to 76.79% and 90.14%, respectively. The addition of isopropanol caused the most suppressive effect on the sonocatalytic degradation of LEV for both US/BC-TiO 2 (decreasing from 72.88% to 13.99%) and US/BC-ZrO 2 (decreasing from 66.42% to 16.43%) processes. The reusability test results showed an approximately 20% reduction in the sono-reactor performance within three consecutive experimental runs with no substantial change in the functional groups of the as-prepared sonocatalyst. Intermediates of LEV decomposed by the two sonocatalytic processes were also identified. [ABSTRACT FROM AUTHOR]- Published
- 2022
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