Nguyen, Lan Huong
[Author];
Nguyen, Xuan Hoan
[Author];
Thai, Nam Van
[Author];
Le, Hoang Nghiem
[Author];
Bui Thi, Thu Thao
[Author];
Bui Thi, Kim Trinh
[Author];
Nguyen, Hung M.
[Author];
Le Minh, Thanh
[Author];
Van, Huu Tap
[Author]
Promoted Degradation of Ofloxacin by Ozone Integrated with Fenton-Like Process Using Iron-Containing Waste Mineral Enriched by Magnetic Composite as Heterogeneous Catalyst
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Media type:
E-Book
Title:
Promoted Degradation of Ofloxacin by Ozone Integrated with Fenton-Like Process Using Iron-Containing Waste Mineral Enriched by Magnetic Composite as Heterogeneous Catalyst
Description:
In this study, a heterogeneous catalyst derived from iron-containing waste mineral enriched by magnetic composite (Fe3+/Fe2+) was developed and applied in integrated ozone/Fenton system to mineralize ofloxacin (OFL) from aqueous solution. A modification ratio of 5% between mixture of (Fe3+/Fe2+) and iron slag (FS) for maximum mineralization efficiency of OFL by O3/Fenton A comparative study between O3, perozone (H2O2) and O3/Fenton systems in mineralization of ofloxacin (OFL) under various solution pH, H2O2 dosages, initial OFL concentrations and catalyst (MFS-5) dosages was performed. Adding Fenton reagent (H2O2/MFS-5) into ozonation system gave the highest removal efficiency of OFL (70%) due to synergistic effect of O3 and Fenton reagent. The mineralization degree of OFL assessed through COD removal efficiency was in the following order: O3/Fenton>O3/H2O2>O3. The degradation kinetic of OFL followed pseudo-first order model with Kd values (reaction rate constant) following the same sequence as mineralization efficiency of OFL and high R2 values. The catalyst’s properties were evaluated through SEM image, EDS and mapping data, FTIR and XRD. The main mineralization mechanism of OFL was through hydroxyl radical (*OH) formed during ozonation process because FeO, Fe3O4 and SiO2 in the MFS-5’s constituent accelerated decomposition of O3 and promoted reaction rate with H2O2. Besides, the catalyst exhibited a good stability after five consecutive runs with negligible change in mineralization efficiency of OFL by O3/Fenton system. These findings indicated utilizing magnetic-modified waste iron mineral as heterogeneous catalyst in combination with H2O2 and O3 achieved high efficiency and feasibility in removal of OFL antibiotic from wastewater