Heterogeneous Fenton Reaction for Degradation of Ofloxacin with Magnetic CeO2/Fe3O4

doi:10.15541/jim20150542

Abstract

Abstract:

CeO₂/Fe₃O₄ magnetic nanoparticles were prepared for promoting the catalytic activity of Fe₃O₄, which is applied as the catalyst of heterogeneous Fenton reaction system for the degradation of ofloxacin. Several factors that affected the degradation efficiency of the system such as CeO₂ content, H₂O₂concentration and pH were investigated. The mechanism of catalytic degradation was also explored via the measurement of iron ion and kinetics fitting. The results show that the catalytic activity of CeO₂/Fe₃O₄ is better than that of Fe₃O₄. The degradation efficiency of ofloxacin increases with the addition of CeO₂ content, H₂O₂concentration or solution acidity increase. The degradation effect of ofloxacin is the best for CeO₂/Fe₃O₄(molar roction=0.780)-H₂O₂ catalytic system when H₂O₂concentration is 100 mmol/L and pH is 3, which accords first order kinetics model. The catalytic ability of CeO₂/Fe₃O₄is strengthened through surface catalytic reaction and electronic transfer of oxygen vacancies of CeO₂during catalytic reaction.

Key words: ferriferrous oxide, cerium oxide, degradation, ofloxacin

CLC Number:

HU Xiao-Dan, ZHOU Zhi-Wei, ZHANG Wei, ZHANG Xiao-Hong, ZHANG Hai-Qian. Heterogeneous Fenton Reaction for Degradation of Ofloxacin with Magnetic CeO₂/Fe₃O₄[J]. Journal of Inorganic Materials, 2016, 31(6): 613-620.

Figures/Tables 14

Table 1 Element weight percent of CeO2/Fe3O4 samples

	FC1	FC2	FC3	FC4
Fe(wt%)	80.52	57.73	50.53	43.16
Ce(wt%)	4.44	7.81	27.29	28.10
CeO₂: Fe₃O₄ (mol:mol)	0.066	0.162	0.647	0.780

Fig. 1 XRD pattern of CeO2/Fe3O4 sample

Fig. 2 TEM (HRTEM) and SAED images of CeO2/Fe3O4 sample

Fig. 3 XPS spectra of CeO2/Fe3O4 sample. (a) wide-scan, (b) Fe2p, (c) O1s, and (d) Ce3d

Fig. 4 Magnetic hystersis loop (a) and partial enlarged drawing of Fe3O4 and CeO2/Fe3O4 samples (b)

Fig. 5 Catalytic effects of different samples

Fig. 6 Effect of the amount of CeO2 on the degradation of ofloxacin

Fig. 7 Effect of H2O2 dosage on the degradation of ofloxacin

Fig. 8 Effect of pH on the degradation of ofloxacin

Fig. 9 Changes of iron concentration in the solution

Fig. 10 Effect of iron ion on the degradation of ofloxacin

Fig. 11 Kinetic fitting of zero- (a), first- (b) and second- (c) order reaction

Table 2 Correlation coefficent of zero, first and second-order kinetic fitting

R²	Fe₃O₄	FC1	FC2	FC3	FC4
Zero	0.938825	0.916653	0.890551	0.845094	0.727916
First	0.982795	0.958715	0.977587	0.992056	0.991458
Second	0.927562	0.96293	0.873888	0.739858	0.616759

Fig. 12 Mechanism of heterogeneous Fenton reaction

References 19

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Heterogeneous Fenton Reaction for Degradation of Ofloxacin with Magnetic CeO₂/Fe₃O₄

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