Uptake of Ni(II) from aqueous solution onto graphene oxide: Investigated by batch and modeling techniques

Gao, Huiyi; Wang, Yiquan

doi:10.1016/j.molliq.2016.12.045

Cited by 9 publications

(3 citation statements)

References 64 publications

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“…Moreover, the values of q e rose from 167.5 mg/g to 174.83 mg/g with the temperature increasing from 293 K to 313 K, which corresponded with the findings obtained above. The kinetic data obtained in this study are also consistent with other research demonstrating that the pseudo-second-order model can simulate the kinetics of heavy metals sorption on GO well [ 28 , 32 , 41 ].…”

Section: Resultssupporting

confidence: 90%

“…The binding energy of O 1s XPS at 531.25, 532.48, 533.02, and 533.45 eV can be indexed to C=O, C–O–C, C–OH and adsorbed H 2 O (chemisorbed/intercalated adsorbed water molecules), respectively. The findings from the XPS analysis illustrated that the GO sheets were decorated with plentiful oxygenic functionalities (such as hydroxyl, epoxy, carboxyl, and carbonyl groups) [ 32 ]. Figure 1 E illustrates the XRD pattern of GO.…”

Section: Resultsmentioning

confidence: 99%

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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: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

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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“…The specific surface area of the AC (1707 m 2 g -1 ) was found to be about twelve-fold the one of the commercial GO flakes (144 m 2 g -1 ). The low specific surface area obtained for GO flakes is consistent with other literature data [21,24], and can be attributed to the stacking, folding, crumpling or pillaring of the layer (or multilayer) graphene plates during processing operations of graphene-based materials, which results in complex porous structures with surface areas considerably lower than the theoretical one (2600 m 2 g -1 ) [25]. Despite the low specific surface area of the solid GO used in this work, it is worth mentioning that, in our experimental work, the GO flakes were dispersed in water with the aid of sonication prior to its use in the DµSPE procedure.…”

Section: Characterization Of the Adsorbentssupporting

confidence: 92%

Dispersive micro solid-phase extraction (DµSPE) with graphene oxide as adsorbent for sensitive elemental analysis of aqueous samples by laser induced breakdown spectroscopy (LIBS)

Ruíz

Ripoll

Hidalgo

et al. 2019

Talanta

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In this work, the combination of dispersive micro solid-phase extraction (DµSPE) with laser-induced breakdown spectroscopy (LIBS) was evaluated for simultaneous preconcentration and detection of Zn, Cd, Mn, Ni, Cr and Pb in aqueous samples. Two adsorbent materials were tested in the microextraction step, namely graphene oxide and activated carbon. In both cases, the microextraction process consisted in the dispersion of a small quantity of adsorbent in the sample solution containing the analytes. However, while the use of activated carbon required a previous chelation of the metals, this step was avoided with the use of graphene oxide. After extraction, the analytes retained in the adsorbents were analysed by LIBS. Several experimental factors affecting the extraction of the metals (adsorbent amount, pH and extraction time) were optimized by means of the traditional univariate approach. Under optimum microextraction conditions, the analytical features of the proposed DµSPE-LIBS methods were assessed, leading to limits of detection below 100 µg kg and 50 µg kg with the use of activated carbon and graphene oxide, respectively, as adsorbents in the DµSPE process. Trueness evaluation of the most sensitive procedure was carried out by spike and recovery experiments in a real sample of tap water, leading to recovery values in the range 98-110%.

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When graphene meets circular agriculture: Insights into agricultural sustainable development

Li,

Tang,

Bao

et al. 2024

Biosystems Engineering

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Uptake of Ni(II) from aqueous solution onto graphene oxide: Investigated by batch and modeling techniques

Cited by 9 publications

References 64 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

Dispersive micro solid-phase extraction (DµSPE) with graphene oxide as adsorbent for sensitive elemental analysis of aqueous samples by laser induced breakdown spectroscopy (LIBS)

When graphene meets circular agriculture: Insights into agricultural sustainable development

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