Highly stable and covalently functionalized magnetic nanoparticles by polyethyleneimine for Cr(<scp>vi</scp>) adsorption in aqueous solution

Chen, Bin; Zhao, Xuesong; Liu, Yang; Xu, Biao; Pan, Xuejun

doi:10.1039/c4ra10602d

Cited by 74 publications

(39 citation statements)

References 57 publications

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“…Since pseudo-second order kinetic models are most likely to explain the adsorption processes for Zn(II) and As(III) uptake, the assumption then was that the rate determining step is chemisorption and bimolecular between imine group of the adsorbent and heavy metal ions. This observation is in agreement with previously conducted studies [42]. …”

Section: Kinetic Studysupporting

confidence: 83%

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Ojemaye

Okoh

2018

Water

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Abstract:In this paper, imine functionalized magnetic nanoparticles (MNP-Maph) were employed to aqueous solutions for the uptake of Zn(II) and As(III). Characterization of the material showed the successful synthesis of this material. Factors affecting the uptake of metal ions in aqueous solution such as change in pH, time, adsorbent dose, adsorbate concentration, and temperature were investigated and optimized to determine the best experimental conditions for the effective adsorption of Zn(II) and As(III) from wastewater samples. The adsorption capacity of MNP-Maph followed similar patterns as that of amine functionalized magnetic nanoparticles (MNP-NH 2 ) for the uptake of both metal ions from aqueous solution when solution pH was varied. Higher pH values favored the uptake of Zn(II) and As(III) by using both adsorbents. Also, increasing the contact time and temperature yielded a higher uptake of Zn(II) and As(III). Both processes can best be described with a pseudo-second order kinetic model, while the Langmuir maximum adsorption capacity (q m ) for Zn(II) increased from 35.83 to 54.53 mg g −1 , and for As(III) from 50.08 to 57.60 mg g −1 .Of note is that the q m of As(III) was higher than that of Zn(II) because of the lower concentration of As(III) in solution compared to that of Zn(II), and thermodynamic parameters indicated that the adsorption processes were heat absorbing and rapid in nature. Experiments to evaluate if the adsorbent could be recycled showed excellent recyclability capacity of MNP-Maph after seven runs. Lastly, application of MNP-Maph for the uptake of Zn(II) and As(III) from municipal wastewater samples showed remarkable sorption performance confirming the potential of imine functionalized magnetic nanoparticles as an excellent adsorbent for the uptake of metal ions from aqueous solutions.

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Section: Kinetic Studysupporting

confidence: 83%

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Ojemaye

Okoh

2018

Water

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“…1 1 e t e t t q k q q = + ⋅ ⋅ (4) where q e (mg/g) and q t (mg/g) are the amounts of Cr(VI) adsorbed at equilibrium time and at any instant of time, t, respectively, k 1 (1/min) and k 2 (g/(mg min)) are the rate constant of pseudo-first-order and pseudo-second-order model, respectively. The values of k 1 and k 2 can be determined from the slope of the linear plot of log(q e -q t ) versus t and t/q t versus t, respectively.…”

Section: Rsc Advances Accepted Manuscriptmentioning

confidence: 99%

“…[1][2][3][4] To prevent the harmful impact of Cr(VI) on public health, many countries around the world have regulations of the maximum permissible concentration of Cr(VI) in natural or drinking water. [1][2][3][4] To prevent the harmful impact of Cr(VI) on public health, many countries around the world have regulations of the maximum permissible concentration of Cr(VI) in natural or drinking water.…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Cr(vi) onto a magnetic CoFe₂O₄/MgAl-LDH composite and mechanism study

2015

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Magnetic materials as adsorbent can provide effective remove and quickly separate of pollutant in wastewater treatment. A magnetic CoFe 2 O 4 /MgAl-LDH composite was successfully synthesized through low saturation coprecipitation method. The adsorption behaviors of Cr(VI) from aqueous solution by CoFe 2 O 4 /MgAl-LDH were investigated. The adsorbents were characterized using scanning electron microscope (SEM), N 2 adsorption/desorption isotherms, X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). Kinetic and equilibrium studies indicated that the experimental data of Cr(VI) adsorption were best described by pseudo-second-order kinetic and Langmuir models. The maximum adsorption capacity of CoFe 2 O 4 /MgAl-LDH for Cr(VI) was found to be 72.4 mg/g at an equilibrium time of 300 min and temperature of 283 K. Evaluation of the thermodynamics parameters ( ∆ H < 0, ∆ S < 0 and ∆ G < 0) revealed the adsorption process was exothermic and spontaneous. The mechanisms study showed that the adsorption of Cr(VI) onto CoFe 2 O 4 /MgAl-LDH likely involved adsorption/surface complexation and ion exchange interaction. This study demonstrated that the magnetic CoFe 2 O 4 /MgAl-LDH composite was an effective adsorbent for Cr(VI) removal with quick separation.

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“…The synthesis of the adsorbents was carried out according to the previous reported method with slight modification . First, 4 g of sodium acetate anhydrous and 2 g of FeCl 3 .6H 2 O were added into 60 mL ethylene glycol, and the mixture was vigorously stirred at 50°C until the solids were fully dissolved.…”

Section: Methodsmentioning

confidence: 99%

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

Liu¹,

Xin²,

Lin³

et al. 2016

J of Separation Science

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A simple, accurate, and highly sensitive analytical method was developed in this study for the determination of nine β-agonists in milk. In this method, a new magnetic adsorbent of molecularly imprinted polymers/magnetic nanoparticles prepared by simple physical blending was adopted, which enabled magnetic solid-phase extraction. Thus, the resultant material can be separated from the solvent rapidly and conveniently by a magnet. Two kinds of molecularly imprinted polymer/magnetic nanoparticles materials were fabricated, and the characteristics of materials such as the ratio, pH, amount, desorption, and regeneration were investigated. The analytes were quantified by ultra high performance liquid chromatography coupled to an electrospray ionization tandem mass spectrometer operating in multiple reaction monitoring modes. The detection limit of the method was 0.003-0.3 μg/L, and the detection capability was 0.01-0.3 μg/L. The recoveries of these compounds were 65.7-114% at three spiked levels. Reproducibility represented by relative standard deviation was 11.2% or less. The method was successfully applied to the screening of real samples obtained from local markets and confirmation of the suspected target analytes.

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Highly stable and covalently functionalized magnetic nanoparticles by polyethyleneimine for Cr(vi) adsorption in aqueous solution

Abstract: Covalently functionalized magnetic nanocomposite by polyethyleneimine (PEI) acted as superior adsorbent for removal of Cr(vi) form water.

Cited by 74 publications

References 57 publications

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Adsorption of Cr(vi) onto a magnetic CoFe₂O₄/MgAl-LDH composite and mechanism study

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

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Highly stable and covalently functionalized magnetic nanoparticles by polyethyleneimine for Cr(vi) adsorption in aqueous solution

Abstract: Covalently functionalized magnetic nanocomposite by polyethyleneimine (PEI) acted as superior adsorbent for removal of Cr(vi) form water.

Cited by 74 publications

References 57 publications

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Uptake of Zn2+ and As3+ from Wastewater by Adsorption onto Imine Functionalized Magnetic Nanoparticles

Adsorption of Cr(vi) onto a magnetic CoFe2O4/MgAl-LDH composite and mechanism study

Magnetic molecularly imprinted polymers for the determination of β‐agonist residues in milk by ultra high performance liquid chromatography with tandem mass spectrometry

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Adsorption of Cr(vi) onto a magnetic CoFe₂O₄/MgAl-LDH composite and mechanism study