Dataset Information

A Generalized Method for the Synthesis of Carbon-Encapsulated Fe₃O₄ Composites and Its Application in Water Treatment.

ABSTRACT: In this paper, a simple and environmentally friendly method was developed for the preparation of highly stable C@Fe₃O₄ composites with controllable morphologies using sodium alginate as the carbon source and the easily obtained α-Fe₂O₃ as the precursors. The morphologies of the as-prepared C@Fe₃O₄ composites, inherited from their corresponding precursors of α-Fe₂O₃, survived from the annealing treatments, were characterized by the field-emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and inductively coupled plasma-atomic emission spectroscopy (ICP-AES). The C@Fe₃O₄ composites resisted to oxidation, acidification and aggregation, exhibiting porous structures and ferromagnetic properties at room temperature. Moreover, the adsorption performance of the C@Fe₃O₄ composites was evaluated by absorbing MB (methylene blue) in liquid environment. Experiments indicated that the C@Fe₃O₄ composites exhibited highly enhanced adsorption capacities and efficiencies as compared with their corresponding precursors of α-Fe₂O₃. This generalized method for the synthesis of C@Fe₃O₄ composites provides promising applications for the highly efficient removal of MB from industrial effluents.

SUBMITTER: Duan S

PROVIDER: S-EPMC9607371 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature

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A Generalized Method for the Synthesis of Carbon-Encapsulated Fe3O4 Composites and Its Application in Water Treatment.

Duan Shengxia S Liu Jian J Pang Yanling Y Lin Feng F Meng Xiangyan X Tang Ke K Li Jiaxing J

Molecules (Basel, Switzerland) 20221011 20

In this paper, a simple and environmentally friendly method was developed for the preparation of highly stable C@Fe3O4 composites with controllable morphologies using sodium alginate as the carbon source and the easily obtained α-Fe2O3 as the precursors. The morphologies of the as-prepared C@Fe3O4 composites, inherited from their corresponding precursors of α-Fe2O3, survived from the annealing treatments, wer ...[more]

PMID: 36296405

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Project description:Dyes in wastewater are a serious problem that needs to be resolved. Adsorption coupled photocatalysis is an innovative technique used to remove dyes from contaminated water. Novel composites of TiO2-Fe3C-Fe-Fe3O4 dispersed on graphitic carbon were fabricated using natural ilmenite sand as the source of iron and titanium, and sucrose as the carbon source, which were available at no cost. Synthesized composites were characterized by X-ray diffractometry (XRD), Raman spectroscopy, transmission electron microscopy (TEM), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), X-ray fluorescence spectroscopy (XRF), and diffuse reflectance UV-visible spectroscopy (DRS). Arrangement of nanoribbons of graphitic carbon with respect to the nanomaterials was observed in TEM images, revealing the occurrence of catalytic graphitization. Variations in the intensity ratio (I D/I G), L a and L D, calculated from data obtained from Raman spectroscopy suggested that the level of graphitization increased with an increased loading of the catalysts. SEM images show the immobilization of nanoplate microballs and nanoparticles on the graphitic carbon matrix. The catalyst surface consists of Fe3+ and Ti4+ as the metal species, with V, Mn, and Zr being the main impurities. According to DRS spectra, the synthesized composites absorb light in the visible region efficiently. Fabricated composites effectively adsorb methylene blue via π-π interactions, with the absorption capacities ranging from 21.18 to 45.87 mg/g. They were effective in photodegrading methylene blue under sunlight, where the rate constants varied in the 0.003-0.007 min-1 range. Photogenerated electrons produced by photocatalysts captured by graphitic carbon produce O2 •- radicals, while holes generate OH• radicals, which effectively degrade methylene blue molecules. TiO2-Fe3C-Fe-Fe3O4/graphitic carbon composites inhibited the growth of Escherichia coli (69%) and Staphylococcus aureus (92%) under visible light. Synthesized novel composites using natural materials comprise an ecofriendly, cost-effective solution to remove dyes, and they were effective in inhibiting the growth of Gram-negative and Gram-positive bacteria.

Dataset Information

A Generalized Method for the Synthesis of Carbon-Encapsulated Fe₃O₄ Composites and Its Application in Water Treatment.

Publications

A Generalized Method for the Synthesis of Carbon-Encapsulated Fe<sub>3</sub>O<sub>4</sub> Composites and Its Application in Water Treatment.

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