Design of three-dimensional macroporous reduced graphene oxide–Fe3O4 nanocomposites for the removal of Cr(VI) from wastewater

Liu, Yurong; Zhang, Zongqiang; Sun, Xiangwei; Wang, Tianyu

doi:10.1007/s10934-018-0624-1

Cited by 9 publications

(2 citation statements)

References 63 publications

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“…They showed high adsorption capacities, rapid adsorption rates for Cr(VI), and easy magnetic separation for reusability. Interestingly, the Fe3O4 nanoparticles serve as stabilizers for separating graphene nanosheets from aggregation, while the graphene nanosheets favor hindering them from agglomeration and enabling their good distribution on the surface of graphene [48]. Thermal decomposition method: ferromagnetic 3D flower-like γ-Fe2O3 particles with an adsorption capacity of 102.7 mg•g −1 for CR were prepared by a simple direct thermal decomposition method using cheap and nontoxic ferric nitrate as an iron source and CTAB as a structure-directing agent.…”

Section: Other Preparation Methodsmentioning

confidence: 99%

Selective Adsorption of Hazardous Substances from Wastewater by Hierarchical Oxide Composites: A Review

Tu,

Cai

2024

Toxics

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Large volumes of wastewater containing toxic contaminants (e.g., heavy metal ions, organic dyes, etc.) are produced from industrial processes including electroplating, mining, petroleum exploitation, metal smelting, etc., and proper treatment prior to their discharge is mandatory in order to alleviate the impacts on aquatic ecosystems. Adsorption is one of the most effective and practical methods for removing toxic substances from wastewater due to its simplicity, flexibility, and economics. Recently, hierarchical oxide composites with diverse morphologies at the micro/nanometer scale, and the combination advantages of oxides and composite components have been received wide concern in the field of adsorption due to their multi-level structures, easy functionalization characteristic resulting in their large transport passages, high surface areas, full exposure of active sites, and good stability. This review summarizes the recent progress on their typical preparation methods, mainly including the hydrothermal/solvothermal method, coprecipitation method, template method, polymerization method, etc., in the field of selective adsorption and competitive adsorption of hazardous substances from wastewater. Their formation processes and different selective adsorption mechanisms, mainly including molecular/ion imprinting technology, surface charge effect, hard-soft acid-base theory, synergistic effect, and special functionalization, were critically reviewed. The key to hierarchical oxide composites research in the future is the development of facile, repeatable, efficient, and scale preparation methods and their dynamic adsorption with excellent cyclic regeneration adsorption performance instead of static adsorption for actual wastewater. This review is beneficial to broaden a new horizon for rational design and preparation of hierarchical oxide materials with selective adsorption of hazardous substances for wastewater treatment.

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Section: Other Preparation Methodsmentioning

confidence: 99%

Selective Adsorption of Hazardous Substances from Wastewater by Hierarchical Oxide Composites: A Review

Tu,

Cai

2024

Toxics

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“…However, the bare Fe 3 O 4 is unstable and dissolved in complex environments, thus reducing surface-active sites [24,25]. Different carriers are proposed to fix the bare magnetic Fe 3 O 4 to enhance its stability [26]. reported sludge as a carrier for Fe 3 O 4 to produce sludge based magnetic Fe 3 O 4 microspheres.…”

Section: Introductionmentioning

confidence: 99%

Adsorption-Reduction of Cr(VI) with Magnetic Fe-C-N Composites

Liu

Cui

et al. 2023

Water

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In this study, the iron-based carbon composite (hereafter FCN-x, x = 0, 400, 500, and 600 calcination) was synthesized by a simple high-temperature pyrolysis method using iron-containing sludge coagulant generated from wastewater treatment settling ponds in chemical plants. The FCN-x was used for the adsorptive reduction of aqueous phase Cr(VI) effectively. The FCN-x was characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier infrared spectrometer (FT-IR), X-ray photoelectron spectrometer (XPS), and Brunauer-Emmett-Teller theory (BET). FCN-x adsorption of Cr(VI) was examined in batch experiments using CrO42− as a function of physicochemical parameters. The chemical kinetics of Cr(VI) adsorption by FCN-500 were modeled by 1st and 2nd order empirical pseudo kinetics. Based on these experiments, FCN-500 has been selected for further studies on Cr(VI) adsorptive reduction. The maximum Cr(VI) adsorption by FCN-500 was 52.63 mg/g showing the highest removal efficiency. The Cr(VI) adsorption by the FCN-500 was quantified by the Langmuir isotherm. XPS result confirmed the reduction of Cr(VI) to Cr(III) by the FCN-500. The iron-based carbon composites have high reusability and application potential in water treatment. The electroplating wastewater with 117 mg/L Cr(VI) was treated with FCN-500, and 99.93% Cr(VI) was removed within 120 min, which is lower than the national chromium emission standard of the People’s Republic of China. This work illustrates the value-added role of sludge generated from dye chemical plants to ensure environmental sustainability.

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Morphology control and optical characterization of three-dimensional ordered macroporous Cu films from template-assisted electrodeposition

2020

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Design of three-dimensional macroporous reduced graphene oxide–Fe3O4 nanocomposites for the removal of Cr(VI) from wastewater

Cited by 9 publications

References 63 publications

Selective Adsorption of Hazardous Substances from Wastewater by Hierarchical Oxide Composites: A Review

Selective Adsorption of Hazardous Substances from Wastewater by Hierarchical Oxide Composites: A Review

Adsorption-Reduction of Cr(VI) with Magnetic Fe-C-N Composites

Morphology control and optical characterization of three-dimensional ordered macroporous Cu films from template-assisted electrodeposition

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