Synthesis of graphene oxide and its application for the adsorption of Pb +2 from aqueous solution

Raghubanshi, Himanshu; Ngobeni, Shalate M.; Osikoya, Adeniyi Olugbenga; Shooto, Ntaote David; Dikio, Charity Wokwu; Naidoo, Eliazer Bobby; Dikio, Ezekiel Dixon; Pandey, Rajiv K.; Prakash, Rajiv

doi:10.1016/j.jiec.2016.11.028

Cited by 67 publications

(21 citation statements)

References 45 publications

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“…Figure 1 E illustrates the XRD pattern of GO. Ragubanshi et al (2017) found that the diffraction peak of pure graphite was appropriately 2θ = 26.58° [ 33 ]. One can see that only one weak diffraction peak at 2θ = 10.66° was shown, which corresponded to the GO nanosheets and was attributed to the (002) plane.…”

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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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: 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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“…As shown below, the pseudo second-order kinetic model presented a higher R 2 for the three biochars, and the theoretical equilibrium capacity (q e the were 3.27, 3.07 and 3.14 mg/g for WBC300, WBC400, and WBC600, respectively) was close to the experimental value (q e exp were 3.28, 3.10, 2.98 mg/g for WBC300, WBC400, and WBC600, respectively), with corresponding standard deviations of 0.71%, 2.12% and 11.31%. This implies that the adsorption of Hg(II) by WBCs is not only determined by a single factor, but by a variety of mechanisms, and that the main rate determining step was controlled by chemical adsorption, involving surface adsorption and valence forces such as ion or electron exchange [55,56]. Additionally, Rao et al [57] achieved the similar result with our kinetics study.…”

Section: Adsorption Kineticssupporting

confidence: 86%

The wheat straw biochar research on the adsorption/desorption behaviour of mercury in wastewater

Zhang¹,

Abdalla²,

Luo³

et al. 2018

Desalination and Water Treatment

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a b s t r a c tThe adsorption/desorption behaviour and varying adsorption mechanisms of Hg(II) in simulated wastewater were evaluated using wheat straw biochars (WBCs) prepared under three different slow pyrolysis temperatures (300°C, 400°C, and 600°C, referred as WBC300, WBC400, and WBC600, respectively). The adsorption isotherm characteristics for these biochars were extensively described by the Langmuir isotherm (R 2 > 0.9782) and pseudo-second-order kinetics (R 2 > 0.9421) models, with the maximum theoretical adsorbing capacity measured at 5.85, 4.13, and 3.56 mg/g, respectively, in the following order: WBC300 > WBC400 > WBC600. The experimental results showed that there was a direct competitive adsorption in Pb(II) and Hg(II) binary system, whereas not in Cd(II) and Hg(II) system. The Hg(II) desorption behaviour on the surface of these biochars, confirmed by the FTIR results and water-soluble cations test, which indicated that the low temperature biochars (WBC300 and WBC400) adsorbed Hg(II) mainly relied on complexation reactions with oxygen-containing functional groups such as carboxyl, alcoholic and phenolic hydroxyl, while high temperature biochars (WBC600) mainly relied on ion-exchange interactions. This research proposes an efficient, environmentally friendly, and economical method for mercury-containing wastewater remediation and simultaneous agriculture residue treatment.

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“…Figure 2a shows the FT-IR spectra of NCO-M, GO and mGO. The presence of characteristic peaks of GO, such as the hydroxyl (3000-3700 cm −1 ), carbonyl (1730 cm −1 ), epoxy (1217 cm −1 ) and alkoxy (1056 cm −1 ) groups, confirmed that the oxidation reaction occurred [40,41]. In the mGO spectrum, all the signature peaks of NCO-M are also observed, except the characteristic peak at 2260 cm −1 , which originates from the isocyanate group in NCO-M [42], indicating that GO was successfully modified to mGO via the urethane reaction between GO and NCO-M.…”

Section: Synthesis and Characterization Of Mgomentioning

confidence: 83%

Improvement of Mechanical and Self-Healing Properties for Polymethacrylate Derivatives Containing Maleimide Modified Graphene Oxide

Lee

Cha

2020

Polymers

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In this paper, a self-healable nanocomposite based on the Diels-Alder reaction is developed. A graphene-based nanofiller is introduced to improve the self-healing efficiency, as well as the mechanical properties of the nanocomposite. Graphene oxide (GO) is modified with maleimide functional groups, and the maleimide-modified GO (mGO) enhanced the compatibility of the polymer matrix and nanofiller. The tensile strength of the nanocomposite containing 0.030 wt% mGO is improved by 172%, compared to that of a polymer film incorporating both furan-functionalized polymer and bismaleimide without any nanofiller. Moreover, maleimide groups of the surface on mGO participate in the Diels-Alder reaction, which improves the self-healing efficiency. The mechanical and self-healing properties are significantly improved by using a small amount of mGO.

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Synthesis of graphene oxide and its application for the adsorption of Pb +2 from aqueous solution

Cited by 67 publications

References 45 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

The wheat straw biochar research on the adsorption/desorption behaviour of mercury in wastewater

Improvement of Mechanical and Self-Healing Properties for Polymethacrylate Derivatives Containing Maleimide Modified Graphene Oxide

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