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Fe₃O₄@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue.

ABSTRACT: Fe₃O₄@C nanoparticles were prepared by an in situ, solid-phase reaction, without any precursor, using FeSO₄, FeS₂, and PVP K30 as raw materials. The nanoparticles were utilized to decolorize high concentrations methylene blue (MB). The results indicated that the maximum adsorption capacity of the Fe3O4@C nanoparticles was 18.52 mg/g, and that the adsorption process was exothermic. Additionally, by employing H₂O₂ as the initiator of a Fenton-like reaction, the removal efficiency of 100 mg/L MB reached ~99% with Fe₃O₄@C nanoparticles, while that of MB was only ~34% using pure Fe₃O₄ nanoparticles. The mechanism of H₂O₂ activated on the Fe₃O₄@C nanoparticles and the possible degradation pathways of MB are discussed. The Fe₃O₄@C nanoparticles retained high catalytic activity after five usage cycles. This work describes a facile method for producing Fe₃O₄@C nanoparticles with excellent catalytic reactivity, and therefore, represents a promising approach for the industrial production of Fe₃O₄@C nanoparticles for the treatment of high concentrations of dyes in wastewater.

SUBMITTER: Xiang H

PROVIDER: S-EPMC7912336 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature

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Fe3O4@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue.

Xiang Hengli H Ren Genkuan G Zhong Yanjun Y Xu Dehua D Zhang Zhiye Z Wang Xinlong X Yang Xiushan X

Nanomaterials (Basel, Switzerland) 20210127 2

Fe3O4@C nanoparticles were prepared by an in situ, solid-phase reaction, without any precursor, using FeSO4, FeS2, and PVP K30 as raw materials. The nanoparticles were utilized to decolorize high concentrations methylene blue (MB). The results indicated that the maximum adsorption capacity of the Fe3O4@C nanoparticles was 18.52 mg/g, and that the adsorption process was exothermic. Additionally, by employing H2O2 as the initiator o ...[more]

PMID: 33513986

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Project description:SiO2@TiO2 core-shell nanoparticles were successfully synthesized via a simple, reproducible, and low-cost method and tested for methylene blue adsorption and UV photodegradation, with a view to their application in wastewater treatment. The monodisperse SiO2 core was obtained by the classical Stöber method and then coated with a thin layer of TiO2, followed by calcination or hydrothermal treatments. The properties of SiO2@TiO2 core-shell NPs resulted from the synergy between the photocatalytic properties of TiO2 and the adsorptive properties of SiO2. The synthesized NPs were characterized using FT-IR spectroscopy, HR-TEM, FE-SEM, and EDS. Zeta potential, specific surface area, and porosity were also determined. The results show that the synthesized SiO2@TiO2 NPs that are hydrothermally treated have similar behaviors and properties regardless of the hydrothermal treatment type and synthesis scale and better performance compared to the SiO2@TiO2 calcined and TiO2 reference samples. The generation of reactive species was determined by EPR, and the photocatalytic activity was evaluated by the methylene blue (MB) removal in aqueous solution under UV light. Hydrothermally treated SiO2@TiO2 showed the highest adsorption capacity and photocatalytic removal of almost 100% of MB after 15 min in UV light, 55 and 89% higher compared to SiO2 and TiO2 reference samples, respectively, while the SiO2@TiO2 calcined sample showed 80%. It was also observed that the SiO2-containing samples showed a considerable adsorption capacity compared to the TiO2 reference sample, which improved the MB removal. These results demonstrate the efficient synergy effect between SiO2 and TiO2, which enhances both the adsorption and photocatalytic properties of the nanomaterial. A possible photocatalytic mechanism was also proposed. Also noteworthy is that the performance of the upscaled HT1 sample was similar to one of the lab-scale synthesized samples, demonstrating the potentiality of this synthesis methodology in producing candidate nanomaterials for the removal of contaminants from wastewater.

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Fe₃O₄@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue.

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Fe<sub>3</sub>O<sub>4</sub>@C Nanoparticles Synthesized by In Situ Solid-Phase Method for Removal of Methylene Blue.

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