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Parisa Yekan Motlagh,Sema Akay,Berkant Kayan,Alireza Khataee 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.104 No.-
Herein, Pumice (PM)-TiO2-Pd nanocomposite as an efficient catalyst was prepared by modified sol-gelmethod and used for sonophotocatalytic removal of ciprofloxacin (CIP). Various analyses were used toinvestigate the properties of the catalysts. Based on the SEM results, the TiO2 and Pd nanoparticles onthe PM surface were immobilized regularly without aggregation. Also, the crystalline structure and functionalgroups of PM-TiO2-Pd nanocomposite were identified successfully by XRD and FTIR analyses. Thebandgap energy of 2.52, 3.17, and 3.29 eV were calculated for PM-TiO2-Pd, PM-TiO2, and PM indicatinghigher sonophotocatalytic activity of PM-TiO2-Pd nanocomposite. 79.44 % of CIP was removed within120 min of treatment time using in the optimum condition ([PM-TiO2-Pd] = 0.5 g/L, [CIP]0 = 20 mg/Land pH = 6). By adding radical scavengers like EDTA, CrO3, formic acid, and enhancers like K2S2O8 andH2O2 the degradation efficiency was as follows respectively: 37.72, 31.71, 28.29, 88.78, and 72.43%. The reusability and stability of the composite after four consecutive runs was decreased only 9.44%. Also, 8 intermediate byproducts generated under sonophotocatalytic degradation of CIP by PM-TiO2-Pdnanocomposite were identified.
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Parisa Yekan Motlagh,Reza Darvishi Cheshmeh Soltani,Zoha Pesaran,Sema Akay,Berkant Kayan,Yeojoon Yoon,Alireza Khataee 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.114 No.-
The present study aimed at treating a water medium containing pharmaceutical compounds such aslevofloxacin (LEV). For this purpose, ultrasound (US)-based degradation of LEV was catalyzed by TiO2and ZrO2 nano-catalysts supported on biochar (BC). BC was obtained from a precursor composite of papersludge and wheat husk. The application of BC-ZrO2 led to a degradation efficiency of 54.65% within60 min. When BC-TiO2 was used, a lower degradation efficiency of 49.62% was obtained at the same reactiontime. However, increasing the time to 120 min improved the sonocatalytic degradation of LEV by BCTiO2(72.88%) compared to that of BC-ZrO2 (66.42%). In the presence of H2O2 and S2O8 2, the LEV degradationefficiency of US/BC-TiO2 increased from 72.88% to 87.98% and 94.03%, respectively, and for theUS/BC-ZrO2 process, it increased from 66.42% to 76.79% and 90.14%, respectively. The addition of isopropanolcaused the most suppressive effect on the sonocatalytic degradation of LEV for both US/BCTiO2(decreasing from 72.88% to 13.99%) and US/BC-ZrO2 (decreasing from 66.42% to 16.43%) processes. The reusability test results showed an approximately 20% reduction in the sono-reactor performancewithin three consecutive experimental runs with no substantial change in the functional groups of theas-prepared sonocatalyst. Intermediates of LEV decomposed by the two sonocatalytic processes were alsoidentified.
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