期刊
CATALYSTS
卷 12, 期 12, 页码 -出版社
MDPI
DOI: 10.3390/catal12121587
关键词
magnetic catalyst; graphene oxide; titania; primidone; catalytic ozonation; photocatalytic ozonation; water treatment
资金
- Agencia Estatal de Investigacion of Spain [PID2019-104429RBI00]
- European Funds for Regional Development (FEDER) [IB20042, TA18037]
- Junta de Extremadura
An easily recoverable solid photo-catalyst, FeGOTi, was synthesized and used for catalytic ozonation to degrade primidone. The FeGOTi catalyst exhibited high efficiency with its large surface area, appropriate band gap, and main crystalline forms. Different ozonation processes showed varying performance in terms of removal and mineralization of primidone.
An easily recoverable photo-catalyst in solid form has been synthesized and applied in catalytic ozonation in the presence of primidone. Maghemite, graphene oxide and titania (FeGOTi) constituted the solid. Additionally, titania (TiO2) and graphene oxide-titania (GOTi) catalysts were also tested for comparative reasons. The main characteristics of FeGOTi were 144 m(2)/g of surface area; a 1.29 Raman D and G band intensity ratio; a 26-emu g(-1) magnetic moment; maghemite, anatase and brookite main crystalline forms; and a 1.83 eV band gap so the catalyst can absorb up to the visible red region (677 nm). Single ozonation, photolysis, photolytic ozonation (PhOz), catalytic ozonation (CatOz) and photocatalytic ozonation (PhCatOz) were applied to remove primidone. In the presence of ozone, the complete removal of primidone was experienced in less than 15 min. In terms of mineralization, the best catalyst was GOTi in the PhCatOz processes (100% mineralization in 2 h). Meanwhile, the FeGOTi catalyst was the most efficient in CatOz. FeGOTi led, in all cases, to the highest formation of HO radicals and the lowest ozone demand. The reuse of the FeGOTi catalyst led to some loss of mineralization efficacy after four runs, likely due to C deposition, the small lixiviation of graphene oxide and Fe oxidation.
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