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Magnetic core-shell-structured Fe₃O₄@CeO₂ as an efficient catalyst for catalytic wet peroxide oxidation of benzoic acid.

ABSTRACT: A magnetic core-shell-structured Fe₃O₄@CeO₂ catalyst was prepared by a simple solvothermal method and applied in the solid state for catalytic wet peroxide oxidation (CWPO) of benzoic acid. The obtained catalyst was characterized by N₂ adsorption-desorption, X-ray diffraction (XRD), magnetic measurements, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The experimental results showed that Fe₃O₄@CeO₂ possessed superior catalytic efficiency for CWPO of benzoic acid than that of Fe₃O₄. The high catalytic activity was caused by a synergistic effect between Fe₃O₄ and CeO₂, which assisted the decomposition of H₂O₂ into hydroxyl radicals (·OH). Fe₃O₄@CeO₂ exhibited low Fe leaching of 4.2 mg L^-1, which approximately accounted for barely 0.76% of the total Fe amount in the catalyst. The effects of radical scavengers indicated that benzoic acid was degraded mainly by ·OH attack, which occurred both in the bulk solution and on the Fe₃O₄@CeO₂ surface. In the stability tests, there was loss of merely 4% in the benzoic acid removal rate after six cycles of reaction, and the saturation magnetization of Fe₃O₄@CeO₂ hardly changed, which suggested that the Fe₃O₄@CeO₂ catalyst was fairly effective in reutilization and stability.

SUBMITTER: Qin H

PROVIDER: S-EPMC9086735 | biostudies-literature | 2018 Sep

REPOSITORIES: biostudies-literature

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Magnetic core-shell-structured Fe3O4@CeO2 as an efficient catalyst for catalytic wet peroxide oxidation of benzoic acid.

Qin Hangdao H Xiao Rong R Shi Wei W Wang Yong Y Li Hui H Guo Lei L Cheng Hao H Chen Jing J

RSC advances 20180901 59

A magnetic core-shell-structured Fe3O4@CeO2 catalyst was prepared by a simple solvothermal method and applied in the solid state for catalytic wet peroxide oxidation (CWPO) of benzoic acid. The obtained catalyst was characterized by N2 adsorption-desorption, X-ray diffraction (XRD), magnetic measurements, transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The experimental results showed that Fe3O4@C ...[more]

PMID: 35548846

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Project description:BackgroundUnderstanding the in vivo size-dependent pharmacokinetics and toxicity of nanoparticles is crucial to determine their successful development. Systematic studies on the size-dependent biological effects of nanoparticles not only help to unravel unknown toxicological mechanism but also contribute to the possible biological applications of nanomaterial.MethodsIn this study, the biodistribution and the size-dependent biological effects of Fe3O4@SiO2-NH2 nanoparticles (Fe@Si-NPs) in three diameters (10, 20 and 40 nm) were investigated by ICP-AES, serum biochemistry analysis and NMR-based metabolomic analysis after intravenous administration in a rat model.ResultsOur findings indicated that biodistribution and biological activities of Fe@Si-NPs demonstrated the obvious size-dependent and tissue-specific effects. Spleen and liver are the target tissues of Fe@Si-NPs, and 20 nm of Fe@Si-NPs showed a possible longer blood circulation time. Quantitative biochemical analysis showed that the alterations of lactate dehydrogenase (LDH) and uric acid (UA) were correlated to some extent with the sizes of Fe@Si-NPs. The untargeted metabolomic analyses of tissue metabolomes (kidney, liver, lung, and spleen) indicated that different sizes of Fe@Si-NPs were involved in the different biochemical mechanisms. LDH, formate, uric acid, and GSH related metabolites were suggested as sensitive indicators for the size-dependent toxic effects of Fe@Si-NPs. The findings from serum biochemical analysis and metabolomic analysis corroborate each other. Thus we proposed a toxicity hypothesis that size-dependent NAD depletion may occur in vivo in response to nanoparticle exposure. To our knowledge, this is the first report that links size-dependent biological effects of nanoparticles with in vivo NAD depletion in rats.ConclusionThe integrated metabolomic approach is an effective tool to understand physiological responses to the size-specific properties of nanoparticles. Our results can provide a direction for the future biological applications of Fe@Si-NPs.

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Magnetic core-shell-structured Fe₃O₄@CeO₂ as an efficient catalyst for catalytic wet peroxide oxidation of benzoic acid.

Publications

Magnetic core-shell-structured Fe<sub>3</sub>O<sub>4</sub>@CeO<sub>2</sub> as an efficient catalyst for catalytic wet peroxide oxidation of benzoic acid.

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