pH-sensitive magnetic alginate/γ-Fe2O3 nanoparticles for adsorption/desorption of a cationic dye from water

Talbot, Delphine; Abramson, Sébastien; Griffete, Nébéwia; Bée, Agnès

doi:10.1016/j.jwpe.2018.08.013

Cited by 52 publications

(15 citation statements)

References 43 publications

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“…The results confirmed that A/γ-Fe2O3/f-CNT beads are efficient adsorbents of methylene blue, since they can be rapidly and effectively regenerated. Same findings have been described in the literature [66]. After adsorption, the FTIR spectrum of A/γ-Fe 2 O 3 /f-CNT clearly showed the MB signature, indicating its adsorption onto the composite beads.…”

Section: Adsorbent Recyclingsupporting

confidence: 87%

Section: Adsorbent Recyclingsupporting

confidence: 87%

“…The results confirmed that A/γ-Fe2O3/f-CNT beads are efficient adsorbents of methylene blue, since they can be rapidly and effectively regenerated. Same findings have been described in the literature [66]. At low pH values, the functional groups present on the beads surface are protonated, which leads to reduce the electrostatic attractions between MB molecules and the adsorbent surface.…”

Section: Adsorbent Recyclingsupporting

confidence: 81%

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Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

et al. 2019

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In the present study, new adsorbent beads of alginate (A)/maghemite nanoparticles (γ-Fe2O3)/functionalized multiwalled carbon nanotubes (f-CNT) were prepared and characterized by several techniques, e.g., N2 adsorption-desorption isotherms, Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermogravimetric analysis (TGA/DTG), scanning electron microscopy (SEM), and vibrating sample magnetometry (VSM) and further tested for the adsorption of the dye methylene blue (MB) from water. The beads (A/γ-Fe2O3/f-CNT) presented a relatively low BET specific surface area value of 59 m2g−1. The magnetization saturation values of A/γ-Fe2O3/f-CNT beads determined at 295 K was equal to 27.16 emu g−1, indicating a magnetic character. The time needed to attain the equilibrium of MB adsorption onto the beads was estimated within 48 h. Thus, several kinetic and isotherm equation models were used to fit the kinetic and equilibrium experimental results. The number of adsorbed MB molecules per active site, the anchorage number, the receptor sites density, the adsorbed quantity at saturation, the concentration at half saturation and the molar adsorption energy were quantified using the monolayer model. The calculated negative ΔG0 and positive ΔH0 values suggested the spontaneous and endothermic nature of the adsorption process. In addition, A/γ-Fe2O3/f-CNT composites can be used at least for six times maintaining their significant adsorptive performance and could be easily separated by using a magnet from water after treatment.

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Section: Adsorbent Recyclingsupporting

confidence: 87%

Section: Adsorbent Recyclingsupporting

confidence: 87%

“…The results confirmed that A/γ-Fe2O3/f-CNT beads are efficient adsorbents of methylene blue, since they can be rapidly and effectively regenerated. Same findings have been described in the literature [66]. At low pH values, the functional groups present on the beads surface are protonated, which leads to reduce the electrostatic attractions between MB molecules and the adsorbent surface.…”

Section: Adsorbent Recyclingsupporting

confidence: 81%

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Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

et al. 2019

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“…H2O coating [14]. The peak around 3413.24 cm −1 are also vibrational characteristics of the hydroxyl functional group (H-O-H) [18]. These analyses confirm the successful doping of Fe3O4 with carboxyl and hydroxyl group.…”

Section: Structure and Morphology Analysissupporting

confidence: 61%

“…The strong peak at 567.43 cm −1 and a weak peak at 444.18 cm −1 can be attributed to the stretching of Fe-O vibration, which confirms the sample as Fe 3 O 4 [17], and the absorption bands at 1628.27 cm −1 and 1397.34 cm −1 are vibrational characteristics of the C=O emanating from the C 6 H 8 O 7 ·H 2 O coating [14]. The peak around 3413.24 cm −1 are also vibrational characteristics of the hydroxyl functional group (H-O-H) [18]. These analyses confirm the successful doping of Fe 3 O 4 with carboxyl and hydroxyl group.…”

Section: Structure and Morphology Analysissupporting

confidence: 55%

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

et al. 2019

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Magnetite (Fe 3 O 4 ) have been thoroughly investigated as microwave absorbing material due to its excellent electromagnetic properties (permittivity and permeability) and favorable saturation magnetization. However, large density and impedance mismatch are some of the limiting factors that hinder its microwave absorption performance (MAP). Herein, Fe 3 O 4 nanoparticles prepared by facile co-precipitation method have been coated with citric acid and embedded in a polyvinylidene fluoride (PVDF) matrix. The coated Fe 3 O 4 nanoparticles were characterized by X-ray diffraction spectrometer (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), and vibrating sample magnetometer (VSM). COMSOL Multiphysics based on the finite element method was used to simulate the rectangular waveguide at X-band and Ku-band frequency range in three-dimensional geometry. The citric acid coated Fe 3 O 4 /PVDF composite with 40 wt.% filler loading displayed good microwave absorption ability over the studied frequency range (8.2-18 GHz). A minimum reflection loss of −47.3 dB occurs at 17.9 GHz with 2.5 mm absorber thickness. The composite of citric acid coated Fe 3 O 4 and PVDF was thus verified as a potential absorptive material with improved MAP. These enhanced absorption coefficients can be ascribed to favorable impedance match and moderate attenuation. Appl. Sci. 2019, 9, 3877 2 of 17 attracted much interest in the field of EM wave absorption. However, Fe 3 O 4 as an absorptive material have some limitations such as the rapid decrease in permeability value at microwave frequency, large density, ease of oxidation and mismatch of impedance which impedes its performance as an ideal MAM [6,7].Recently, several research efforts have been geared towards improving the microwave absorption performance (MAP) of Fe 3 O 4 . For example, Mingxu et al. [8] fabricated hollow Fe 3 O 4 nanoparticles via solvothermal route, with the aim of reducing its density while retaining good magnetic properties for efficient MAP. They established improved EM wave absorption with increasing particle size and change in morphology. Maximum EM absorption with RL value of −55.14 dB at 11.76 GHz was achieved with an absorber thickness of 2.07 mm. Guiquig et al. [9] synthesized nano-Fe 3 O 4 by an innovative wet chemical route, employing hydrazine hydrate as anti-oxidation agent. The synthesized Fe 3 O 4 nanoparticle of average diameter of 77 nm possessed high magnetization saturation and coercivity value of 72.36 emu/g and 95 Oe, respectively. The minimum RL value of −21.2 dB was achieved with 6 mm thickness. Similarly, optimization of the MAP of Fe 3 O 4 via design and fabrication of hierarchical nanostructure have also been explored. Chaomie et al. [10] exploit one-step and template-free synthesis method to prepare octahedral Fe 3 O 4 nanostructure by direct decomposition of an iron organic compound with molten salt. The sample annealed at 800 • C displayed maximum EM absorption of −23.67 dB at 15.24 GHz at a ...

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Efficient removal of anionic dye by protonated APTES modified hydrochar: The effect of cold‐activation

Arıcı

2023

J Chinese Chemical Soc

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The study focused on determining the effect of acidic and basic cold activation on hydrochar (HC) for the removal of methyl orange (MO). HC was prepared by hawthorn seeds (HS) under hydrothermal carbonization. HC was cold-activated with HCl and NaOH, respectively, and they were grafted with aminopropyltriethoxysilane (APTES) and protonated to obtain AHC-N + (acid-activated and modified HC) and BHC-N + (base-activated and modified HC) to determine the effect of acidic and basic activation. They were characterized by elemental analysis, IR, thermal analysis, zeta potential, N 2 adsorptiondesorption measurements, and SEM-EDX analysis. The prepared adsorbents displayed MO adsorption due to abundant protonated amine groups. BHC-N + showed higher MO adsorption than AHC-N + . The result showed that more protonated APTES groups grafted on the surface of HC via NaOH activation.The obtained data had a good fitting with the Langmuir isotherm and pseudosecond-order kinetic. The maximum adsorption capacity of BHC-N + was 250.38 mg g À1 . The adsorption mechanism could be attributed to the electrostatic interactions between MO and protonated amine groups of APTES and hydrogen bonding.

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pH-sensitive magnetic alginate/γ-Fe2O3 nanoparticles for adsorption/desorption of a cationic dye from water

Cited by 52 publications

References 43 publications

Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

Effective Adsorption of Methylene Blue dye onto Magnetic Nanocomposites. Modeling and Reuse Studies

Investigation of the Broadband Microwave Absorption of Citric Acid Coated Fe3O4/PVDF Composite Using Finite Element Method

Efficient removal of anionic dye by protonated APTES modified hydrochar: The effect of cold‐activation

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