Adsorption mechanism of ofloxacin in water with "core-shell" magnetic adsorbent Mn0.6Zn0.4Fe2O4@SiO2-CeO2 capable of oxidation regeneration

XU Dongying; XIE Zhiyin; YU Jing; LIU Jianying; XU Chenghua; DENG Zhiyong; ZHAI Wanting; HAO Qi

doi:10.13801/j.cnki.fhclxb.20210722.002

Volume 39 Issue 6

Jun. 2022

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Article Navigation > Acta Materiae Compositae Sinica > 2022 > 39(6): 2750-2763

XU Dongying, XIE Zhiyin, YU Jing, et al. Adsorption mechanism of ofloxacin in water with 'core-shell' magnetic adsorbent Mn0.6Zn0.4Fe2O4@SiO2-CeO2 capable of oxidation regeneration[J]. Acta Materiae Compositae Sinica, 2022, 39(6): 2750-2763. doi: 10.13801/j.cnki.fhclxb.20210722.002

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XU Dongying, XIE Zhiyin, YU Jing, et al. Adsorption mechanism of ofloxacin in water with "core-shell" magnetic adsorbent Mn_0.6Zn_0.4Fe₂O₄@SiO₂-CeO₂ capable of oxidation regeneration[J]. Acta Materiae Compositae Sinica, 2022, 39(6): 2750-2763. doi: 10.13801/j.cnki.fhclxb.20210722.002

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Adsorption mechanism of ofloxacin in water with "core-shell" magnetic adsorbent Mn_0.6Zn_0.4Fe₂O₄@SiO₂-CeO₂ capable of oxidation regeneration

doi: 10.13801/j.cnki.fhclxb.20210722.002

College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610000, China

Received Date: 2021-05-28
Accepted Date: 2021-07-09
Rev Recd Date: 2021-06-29

Available Online: 2021-07-23

Publish Date: 2022-06-01

Abstract

Abstract

In order to remove ofloxacin (OFXL), which is difficult to biodegrade in water, and break through the bottleneck of solid-liquid separation and regeneration of adsorbents, Mn_0.6Zn_0.4Fe₂O₄ magnetic nanoparticles were modified by SiO₂ and CeO₂ to prepare Mn_0.6Zn_0.4Fe₂O₄@SiO₂-CeO₂ magnetic nanocompsite adsorbents. The as-prepared Mn_0.6Zn_0.4Fe₂O₄@SiO₂-CeO₂ were systematically characterized using XRD, FTIR, SEM, TEM, vibration sample magnetometer. The investigation results of three kinetic models (quasi-first-order kinetics, quasi-second-order kinetics, and intraparticle diffusion models), three isotherm models (Langmuir, Freundlich and D-R models) and adsorption thermodynamics show that the adsorption rate is controlled by multiple factors such as intra-particle diffusion and liquid film diffusion; the adsorption process is dominated by physical adsorption, and the chemical adsorption is the rate-controlling step; the adsorption process is spontaneously and exothermic with entropy increase. The characterization results of FTIR and XRD spectroscopy indicate that the interaction forces between Mn_0.6Zn_0.4Fe₂O₄@SiO₂-CeO₂ and OFLX include π-π conjugation, hydrogen bonding and coordination. After six cycles of adsorption-oxidation regeneration in situ, the equilibrium adsorption capacity of Mn_0.6Zn_0.4Fe₂O₄@SiO₂-CeO₂ for OFLX is 27.00 mg·g⁻¹. The research results can provide basic theoretical data on the control technology of nonbiodegradable OFLX.
- magnetic adsorbent,
- CeO₂,
- oxidation regeneration,
- ofloxacin,
- adsorption mechanism,
- "core-shell" structure
Long Abstrsct
Innovation Points

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References(41)

References

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