Removal of zinc(II) ion by graphene oxide (GO) and functionalized graphene oxide–glycine (GO–G) as adsorbents from aqueous solution: kinetics studies

Najafi, Fahimeh

doi:10.1007/s40089-015-0151-x

Cited by 22 publications

(8 citation statements)

References 18 publications

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“…The q m of Zn(II) on GO counted using the Langmuir model was 208.33 mg/g at 293 K ( Table 1 ), which was higher than other nano-scale sorbents such as: dioctylphetalate trithylenetetraamine magnetic nanoparticle (24.21 mg/g) [ 9 ], nZVI (20.00 mg/g) [ 7 ], nanostructured birnessite-type manganese oxide and birnessite/carbon nanotubes (HB/CNTs) (89.50 mg/g) [ 8 ]. It was also higher than in other research on GO for Zn(II) removal, for example 73 mg/g of GO prepared using amorphous graphite [ 39 ] and 88.12 mg/g of GO prepared using glycine, EDC and NHS [ 40 ]. Moreover, the q m values increased from 208.33 mg/g to 211.42 mg/g with the temperature increasing from 293 K to 313 K ( Table 1 ), indicating that higher temperature promoted a higher adsorption capacity of Zn(II) on GO.…”

Section: Resultsmentioning

confidence: 59%

RETRACTED: Enhanced Adsorption of Zn(II) onto Graphene Oxides Investigated Using Batch and Modeling Techniques

Pan

Liu

et al. 2018

Nanomaterials

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Graphene oxide (GO) was synthesized and employed as an adsorbent for Zn(II) removal from an aqueous solution. The adsorption isotherms showed that Zn(II) adsorption can be better described using the Freundlich model than the Langmuir model. The maximum adsorption capacity of Zn(II) on GO determined using the Langmuir model at pH 7.0 and 293 K was 208.33 mg/g. The calculation of thermodynamic parameters revealed that the process of Zn(II) adsorption on GO was chemisorptions, endothermic, and spontaneous. Kinetic studies indicated that the pseudo-second-order kinetic model showed a better simulation of Zn(II) adsorption than the pseudo-first-order kinetic model. On the basis of surface complexation modeling, the double layer model provided a satisfactory prediction of Zn(II) by inner-sphere surface complexes (for example, SOZn+ and SOZnOH species), indicating that the interaction mechanism between Zn(II) and GO was mainly inner-sphere complexation. In terms of reusability, GO could maintain 92.23% of its initial capability after six cycles. These findings indicated that GO was a promising candidate for the immobilization and preconcentration of Zn(II) from aqueous solutions.

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Section: Resultsmentioning

confidence: 59%

RETRACTED: Enhanced Adsorption of Zn(II) onto Graphene Oxides Investigated Using Batch and Modeling Techniques

Pan

Liu

et al. 2018

Nanomaterials

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“…In this model, it assumes that adsorption occurs on a heterogeneous surface with uniform energy and in multilayer, and can be represented in its linear form by Equation (5) [ 102 ]: Q e = K F × C e 1/n q e is the amount adsorbed per unit mass of adsorbent (mg/g), C e is the concentration of adsorbate in equilibrium in solution, K F (mg 1−n L n g −1 ) and n are the Freundlich constants related to the adsorption capacity and the adsorption intensity, respectively.…”

Section: Resultsmentioning

confidence: 99%

Preparation and Characterization of Graphene Oxide for Pb(II) and Zn(II) Ions Adsorption from Aqueous Solution: Experimental, Thermodynamic and Kinetic Study

2020

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A thermodynamic and kinetic study of the adsorption process of Zn (II) and Pb (II) ions from aqueous solution on the surface of graphene oxide (GO) to establish the mechanisms of adsorbate–adsorbent interaction on this surface. The effect of pH on the retention capacity was studied and adsorption isotherms were determined from aqueous solution of the ions; once the experimental data was obtained, the kinetic and thermodynamic study of the sorption process was carried out. The data were fitted to the Langmuir, Freundlich, Dubinin-Raduskevich and Temkin isotherm models. The results showed that Zn(II) and Pb(II) on the GO adsorbing surface fitted the Langmuir model with correlation coefficients (R2) of 0.996. Kinetic models studied showed that a pseudo-second-order model was followed and thermodynamically, the process was spontaneous according to the values of Gibbs free energy (ΔGo). N2 adsorption isotherms were determined and modeled with the NLDFT (nonlocal density functional theory) and QSDFT (quenched solid density functional theory) kernels.

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“…Due to these graphene-specific properties, it has been increasingly used as an effective adsorbent [16]. One derivative of graphene is graphene oxide (GO) that is used widely [17]. GO sheets consist of functional groups such as: carboxyl, hydroxyl and carbonyl groups [18].…”

Section: Introductionmentioning

confidence: 99%

Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

Azizi

Torabian

Hassani

et al. 2016

Desalination and Water Treatment

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A B S T R A C TThe purpose of this study was to investigate the effect of graphene oxide nanoparticles modified with 4-aminodiphenylamine (GO-A) on the removal of toluene, ethylbenzene, and p-,o-xylene (TEX). Nano-sorbent was characterized using Fourier transform infrared resonance spectroscopy, carbon, hydrogen and nitrogen elemental analysis, BrunauerEmmett-Teller analysis, and transmission electron microscopy. The effect of different experimental parameters including contact time, pH, and initial concentration of adsorbate and adsorbent were examined. According to the results, an optimum TEX removal efficiency was observed at contact time = 5 min, pH 4, and adsorbent dose = 1 g/L at 20 mg/L initial TEX concentration. Besides, the point of zero charge (pH pzc ) was evaluated to be 4. The adsorption isotherms (Langmuir, Freundlich, and Dubinin-RadushKevich) and kinetics (pseudo-first-order, pseudo-second-order, intraparticle diffusion, and Elovich) were used to indicate the isotherm and kinetic parameters. The adsorption process followed Langmuir isotherm and pseudo-second-order kinetic. Finally, GO-A was regenerated at seven cycles for the TEX removal confirming its good regeneration capacity.

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Removal of zinc(II) ion by graphene oxide (GO) and functionalized graphene oxide–glycine (GO–G) as adsorbents from aqueous solution: kinetics studies

Cited by 22 publications

References 18 publications

RETRACTED: Enhanced Adsorption of Zn(II) onto Graphene Oxides Investigated Using Batch and Modeling Techniques

RETRACTED: Enhanced Adsorption of Zn(II) onto Graphene Oxides Investigated Using Batch and Modeling Techniques

Preparation and Characterization of Graphene Oxide for Pb(II) and Zn(II) Ions Adsorption from Aqueous Solution: Experimental, Thermodynamic and Kinetic Study

Adsorption performance of modified graphene oxide nanoparticles for the removal of toluene, ethylbenzene, and xylenes from aqueous solution

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