Graphene oxide functionalized chitosan-magnetite nanocomposite for removal of Cu(II) and Cr(VI) from waste water

Anush, S.M.; Chandan, H.R.; Gayathri, B.H.; Asma, -; Manju, N.; Vishalakshi, B.; Kalluraya, Balakrishna

doi:10.1016/j.ijbiomac.2020.09.059

Cited by 72 publications

(33 citation statements)

References 51 publications

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“…2, the XRD pattern of GO displayed a diffraction peak of crystal plane at 2θ = 10.6°, which was due to the introduction of oxygencontaining groups, such as carboxyl, hydroxyl, epoxy between the graphite layers. 20 In addition, as shown in Fig. 2, the diffraction peaks at around 10.6° of Co-GO, Cu-GO, Zn-GO and Ni-GO samples did not disappear, indicating that the structure of GO was not destroyed after immobilization of these complexes on the GO surface.…”

Section: P-nmrmentioning

confidence: 79%

MPSC6 binuclear complexes immobilized on graphene oxide for oxidation of lignin model compounds and lignin

Zhou¹,

Zou²,

Yang³

2021

Rev.Roum.Chim.

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An efficient process for the oxidative degradation of lignin using M-GO (MPSC6 binuclear complexes immobilized on graphene oxide) biomimetic catalysts in acetonitrile was developed in this work. Different M-GO catalysts (M=Co, Cu, Zn and Ni) were used to catalyze the depolymerization of lignin model compounds and organosolv lignin. The results showed that the immobilization of MPSC6 complexes on GO was favorable for regulating the valuable depolymerization of the model compounds and lignin. The optimal solid catalyst Co-GO exhibited high catalytic activity, which showed a 83.04% conversion of phenolic β-O-4 lignin model compound, a 91.26% conversion of veratryl alcohol and a 96.24% conversion of vanillyl alcohol with a catalyst/model compound ratio of 50 mg:10 mmol and a dosage of 15 mmol H2O2 at 80 °C for 3 h. The stuctural changes of organosolv lignin occurred in catalytic oxidation were analyzed in terms of O/C ratio, molecular weight and OH content of lignin samples, and a plausible mechanism involving the formation of aromatic products and muconolactone from lignin depolymerization over M-GO was also proposed.

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Section: P-nmrmentioning

confidence: 79%

MPSC6 binuclear complexes immobilized on graphene oxide for oxidation of lignin model compounds and lignin

Zhou¹,

Zou²,

Yang³

2021

Rev.Roum.Chim.

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“…Alternatively, the Fe 3 O 4 nanoparticles can be initially synthesised using simple methods, such as co-precipitation using ferric and ferrous salts, as illustrated in the schematic provided in Figure 6a. The Fe 3 O 4 nanoparticles are then combined with the CS/GO hydrogel [174]. Using these approaches, Tran et al [175] showed that a large number of the Fe 3 O 4 nanoparticles were immobilised onto the GO sheets, Figure 6b, while Rebekah et al [164] also concluded that the Fe 3 O 4 nanoparticles became attached to the edges and basal planes of GO.…”

Section: Magnetic Chitosan/gomentioning

confidence: 99%

Recent Developments in Chitosan-Based Adsorbents for the Removal of Pollutants from Aqueous Environments

et al. 2021

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The quality of water is continuously under threat as increasing concentrations of pollutants escape into the aquatic environment. However, these issues can be alleviated by adsorbing pollutants onto adsorbents. Chitosan and its composites are attracting considerable interest as environmentally acceptable adsorbents and have the potential to remove many of these contaminants. In this review the development of chitosan-based adsorbents is described and discussed. Following a short introduction to the extraction of chitin from seafood wastes, followed by its conversion to chitosan, the properties of chitosan are described. Then, the emerging chitosan/carbon-based materials, including magnetic chitosan and chitosan combined with graphene oxide, carbon nanotubes, biochar, and activated carbon and also chitosan-silica composites are introduced. The applications of these materials in the removal of various heavy metal ions, including Cr(VI), Pb(II), Cd(II), Cu(II), and different cationic and anionic dyes, phenol and other organic molecules, such as antibiotics, are reviewed, compared and discussed. Adsorption isotherms and adsorption kinetics are then highlighted and followed by details on the mechanisms of adsorption and the role of the chitosan and the carbon or silica supports. Based on the reviewed papers, it is clear, that while some challenges remain, chitosan-based materials are emerging as promising adsorbents.

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“…The MGO/CS composites can be formed using ex-situ methods [160], where the Fe 3 O 4 nanoparticles are chemically synthesized and then combined with the GO/CS hydrogel [161]. Alternatively, in-situ methods [162,163] can be used. For example, Singh et al [159] used the amide functional groups (formed between the epoxy (GO) and amine (CS) groups) for the in-situ reduction of iron ions to iron oxides.…”

Section: Magnetic Chitosan/gomentioning

confidence: 99%

Graphene-Based Materials Immobilized within Chitosan: Applications as Adsorbents for the Removal of Aquatic Pollutants

et al. 2021

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Graphene and its derivatives, especially graphene oxide (GO), are attracting considerable interest in the fabrication of new adsorbents that have the potential to remove various pollutants that have escaped into the aquatic environment. Herein, the development of GO/chitosan (GO/CS) composites as adsorbent materials is described and reviewed. This combination is interesting as the addition of graphene to chitosan enhances its mechanical properties, while the chitosan hydrogel serves as an immobilization matrix for graphene. Following a brief description of both graphene and chitosan as independent adsorbent materials, the emerging GO/CS composites are introduced. The additional materials that have been added to the GO/CS composites, including magnetic iron oxides, chelating agents, cyclodextrins, additional adsorbents and polymeric blends, are then described and discussed. The performance of these materials in the removal of heavy metal ions, dyes and other organic molecules are discussed followed by the introduction of strategies employed in the regeneration of the GO/CS adsorbents. It is clear that, while some challenges exist, including cost, regeneration and selectivity in the adsorption process, the GO/CS composites are emerging as promising adsorbent materials.

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Graphene oxide functionalized chitosan-magnetite nanocomposite for removal of Cu(II) and Cr(VI) from waste water

Cited by 72 publications

References 51 publications

MPSC6 binuclear complexes immobilized on graphene oxide for oxidation of lignin model compounds and lignin

MPSC6 binuclear complexes immobilized on graphene oxide for oxidation of lignin model compounds and lignin

Recent Developments in Chitosan-Based Adsorbents for the Removal of Pollutants from Aqueous Environments

Graphene-Based Materials Immobilized within Chitosan: Applications as Adsorbents for the Removal of Aquatic Pollutants

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