Shape-controlled synthesis of α-Fe<sub>2</sub>O<sub>3</sub> nanocrystals for efficient adsorptive removal of Congo red

Wang, Jintao; Xu, Lei; Zhang, Zaiyong; Sun, Peipei; Fang, Min; Liu, Hong‐Ke

doi:10.1039/c5ra06324h

Cited by 13 publications

(7 citation statements)

References 52 publications

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“…Liu's group has also reported the selective synthesis of α‐Fe 2 O 3 nanopolyhedra, nanorods, and rice‐shaped nanoparticles, employing 2,4,6‐tris(pyrazol‐1‐yl)‐1,3,5‐triazine (Tptz) as the template. And all these α‐Fe 2 O 3 nanostructures exhibit exciting adsorption performances for the removal of CR . Using a two‐step method, Shi et al .…”

Section: Introductionsupporting

confidence: 86%

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Wang

Sun

et al. 2017

Bulletin Korean Chem Soc

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This work aims to provide a facile method for the preparation of Mn‐doped hematite microrods and reveals the relationship between Mn doping and the enhanced adsorption properties. The adsorption performance of hematite could be greatly enhanced by Mn doping. The maximal adsorption capacity of the Mn‐doped α‐Fe2O3 is calculated to be 84.54 mg/g, which exhibits obviously enhanced adsorption capacity as compared to the un‐doped α‐Fe2O3 (33.02 mg/g). To further understand the adsorption process, the adsorption kinetic as well as thermodynamic behaviors are carefully investigated. The results suggest that the adsorption process of CR onto the adsorbents follows the pseudo‐second‐order kinetic model. Meanwhile, the adsorption process can be designated to be a Langmuir process. The adsorption capacities of CR vary as a function of Mn contents, which are regarded as the synergistic effect between surface areas and pore sizes.

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Section: Introductionsupporting

confidence: 86%

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Wang

Sun

et al. 2017

Bulletin Korean Chem Soc

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“…The color of the dye changes from orange (pH 7) to blue at pH 2 (inset Figure d). The formation of the blue species involves a structural change and not the destruction of the molecule. − Figure d represents the percentage of CR adsorption to CF-2 at different time intervals at pH = 2. The adsorption of dye reached 96.6% in 24 min, three times higher than CF-0 adsorption (Figure S8) and faster than the literature reports (Table S4).…”

Section: Resultsmentioning

confidence: 99%

Iron–Carbon Hybrid Magnetic Nanosheets for Adsorption-Removal of Organic Dyes and 4-Nitrophenol from Aqueous Solution

Manippady

Singh

Basavaraja

et al. 2020

ACS Appl. Nano Mater.

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Here, we report a nonprecious mesoporous adsorbent obtained from the carbonization of bagasse. The material shows an impressive pH-dependent adsorbent property for cationic, anionic, and commercially used dyes along with an organic contaminant (4nitrophenol) in water. The adsorbent shows specific surface area of ∼462 m 2 g −1 and the porous layered structure as confirmed by gas adsorption and microscopic techniques, respectively. Further, pH triggered adsorption of methylene blue (MB, cationic dye), Congo red (CR, anionic dye), and commercial hair dye were studied. The results show >96% adsorption for CR and MB within 24 min at pH 2 and pH 8, respectively. Moreover, fast adsorption response, 92.6% in 20 min, was obtained for a commercially used hair dye and demonstrates the practical applicability of the material for wastewater remediation. Under experimental conditions, adsorbent shows ultrafast adsorption kinetics (4 min to achieve equilibrium state with 99.5% adsorption) for 4-nitrophenol from water. Notably, the adsorbent shows structural stability, easily separable with an external magnetic field, and recyclability with ∼85% efficiency even after the fifth cycle.

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“…1,[9][10][11][12][13][14] Mostly, solution based techniques including hydrothermal approach, sol-gel and forced hydrolysis are preferred for the controlled nanostructure growth. 1,9,10,[14][15][16][17] Electrodeposition, on the other hand, offers a high degree of freedom in manipulating and monitoring the crystal growth processes via deposition potential, current, temperature, precursor concentration and additives. Both cathodic or anodic electrodepositions of a-Fe 2 O 3 from aqueous solutions are reported to date and they require post-annealing process to produce Hematite from an iron oxyhydroxide phase.…”

Section: Introductionmentioning

confidence: 99%

Morphology and crystal structure control of α-Fe₂O₃ films by hydrothermal-electrochemical deposition in the presence of Ce³⁺ and/or acetate, F⁻ ions

Yilmaz

Ünal

2016

RSC Adv.

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Hydrothermal-electrochemical growth of Hematite (a-Fe 2 O 3 ) thin films in the presence of Ce 3+ and/or CH 3 COO À and F À ions is reported. Primary attention is paid to understanding the synergistic effect of temperature and additive ions on the growth of Hematite particles. The literature describes the shapecontrolled electrodeposition of iron oxide films, but these reports involve low-temperature depositions (<100 C) that require a post-annealing step to obtain the Hematite phase. We studied size and shape control of Hematite crystals by introducing capping agents during hydrothermal-electrochemical deposition (HED) at 130 C under autonomous pressure. When HED is used together with growthmodifying species such as CH 3 COO À and/or Ce 3+ , Hematite thin films with various structures including spherical, rhombohedral and platelet-like particles were obtained which were crystallized directly in the a-Fe 2 O 3 phase without thermal annealing. In contrast, either Lepidocrocite or an amorphous phase forms with low-temperature electrodeposition under otherwise identical conditions. Addition of F À into the deposition solution induces formation of bundles that are composed of square planar Akaganeite particles even during HED. The aspect ratio of the Akaganeite particles is controlled with co-addition of Ce 3+ ions. This variety of nanostructures gives us the opportunity to evaluate the photoelectrochemical performance of the a-Fe 2 O 3 films based on particle size and shape. It was demonstrated that porous, square planar a-Fe 2 O 3 with a high aspect ratio shows the highest performance.

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Shape-controlled synthesis of α-Fe₂O₃ nanocrystals for efficient adsorptive removal of Congo red

Abstract: α-Fe2O3 nanocrystals of different sizes and morphologies have been obtained at relatively low temperature with Tptz as template, and the Congo red can be efficient removed by these nanocrystals.

Cited by 13 publications

References 52 publications

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Iron–Carbon Hybrid Magnetic Nanosheets for Adsorption-Removal of Organic Dyes and 4-Nitrophenol from Aqueous Solution

Morphology and crystal structure control of α-Fe₂O₃ films by hydrothermal-electrochemical deposition in the presence of Ce³⁺ and/or acetate, F⁻ ions

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Shape-controlled synthesis of α-Fe2O3 nanocrystals for efficient adsorptive removal of Congo red

Abstract: α-Fe2O3 nanocrystals of different sizes and morphologies have been obtained at relatively low temperature with Tptz as template, and the Congo red can be efficient removed by these nanocrystals.

Cited by 13 publications

References 52 publications

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Enhancing the Adsorption Capacity of Hematite by Manganese Doping: Facile Synthesis and its Application in the Removal of Congo Red

Iron–Carbon Hybrid Magnetic Nanosheets for Adsorption-Removal of Organic Dyes and 4-Nitrophenol from Aqueous Solution

Morphology and crystal structure control of α-Fe2O3 films by hydrothermal-electrochemical deposition in the presence of Ce3+ and/or acetate, F− ions

Contact Info

Product

Resources

About

Shape-controlled synthesis of α-Fe₂O₃ nanocrystals for efficient adsorptive removal of Congo red

Morphology and crystal structure control of α-Fe₂O₃ films by hydrothermal-electrochemical deposition in the presence of Ce³⁺ and/or acetate, F⁻ ions