Fabrication of novel magnetic chitosan/graphene-oxide/metal oxide nanocomposite beads for Cr(VI) adsorption

Naicker, Chrisanne; Nombona, Nolwazi; Zyl, Werner E. van

doi:10.1007/s11696-019-00895-7

Cited by 24 publications

(6 citation statements)

References 62 publications

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“…Glycerol improved the interaction of GO nanosheets with the chitosan matrix. As a result, the chitosan/GO/glycerol nanocomposite can be used in medical applications that demand highly improved mechanical properties [83].…”

Section: Graphene Oxide (Go)/graphene (G) and Chitosan Compositementioning

confidence: 99%

Retracted: Advances in chitosan biopolymer composite materials: from bioengineering, wastewater treatment to agricultural applications

Chadha

Bhardwaj

Selvaraj

et al. 2022

Mater. Res. Express

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Chitosan has become the most known and second abundantly available recyclable, non-hazardous and eco-friendly biopolymer after cellulose with several advantageous biomedical, agriculture, and wastewater treatment applications. As nanotechnology has progressed, researchers have begun incorporating chitosan-based carbon compounds into various compounds, elements, and carbonaceous materials to increase their efficiency and biocompatibility. Chitosan carbon compounds have also been used directly in many applications due to their inherent chelating and antibacterial features and the presence of customizable functional groups. In this review, synthesis technologies and microstructure of chitosan composites and its carbon materials in biomedical, agriculture, and wastewater treatment concerning the administration of abiotic stress within plants, water accessibility for crops, scheming food bear pathogens, photothermal cancer rehabilitation, and heavy water pollutants absorption and removal methods are widely deliberated upon, with a relevant discussion of the techniques that can be used to put these into action. Chitosan is also utilized in miscellaneous applications, including the food sector and cosmetics. Overall, chitosan-based carbon compounds promise to extend agricultural practices while also addressing health concerns in an environmentally friendly manner.

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Section: Graphene Oxide (Go)/graphene (G) and Chitosan Compositementioning

confidence: 99%

Retracted: Advances in chitosan biopolymer composite materials: from bioengineering, wastewater treatment to agricultural applications

Chadha

Bhardwaj

Selvaraj

et al. 2022

Mater. Res. Express

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“…The regression coefficients and the mathematical model error were determined. Subsequently, analysis of variance (ANOVA) was performed to determine the confidence of the model through the coefficient of determination (R 2 ) and the 3D surface plot was obtained in order to evaluate the main and interactive effects between the dependent and independent variables [15]. Thirty-two randomized experiments were performed, including one replication.…”

Section: Methodsmentioning

confidence: 99%

“…On the other hand, K i constants increase with the addition of GO to the system of CS-TiO 2 -GLA. That means the diffusion rate of the dye increased towards their surface [15,44]. Additionally, the values of the C constants of this model provide information about the thickness of the boundary layer, being equal for the three systems.…”

Section: Kinetic Modelingmentioning

confidence: 97%

Chitosan Beads Incorporated with Graphene Oxide/Titanium Dioxide Nanoparticles for Removing an Anionic Dye

et al. 2021

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Dyes present in industrial effluents have been treated by many methods, among which adsorption stands out for its high efficiency, low costs, simple operation processes, and the absence of hazardous byproducts. In this research, two adsorbents were obtained from chitosan beads (CS) cross-linked with glutaraldehyde (GLA), graphene oxide (GO), and titanium dioxide nanoparticles (TiO2) for the adsorption of the anionic dye FD&C Red 40 used as a model pollutant. The optimum removal conditions of FD&C Red 40 dye using CS-TiO2-GLA beads were determined (pH = 1.73, TiO2 amount =279.77 mg, and initial dye concentration = 55.23 mg L−1) with a central composite design with surface response methodology (RSM). The effect of the graphene oxide (GO) in the adsorption properties of CS-TiO2-GLA beads was evaluated, showing a considerable improvement in the removal efficiency of the model dye. The intraparticle diffusion mechanism best described the adsorption kinetics for the two adsorbents. This research demonstrates the potential of chitosan beads incorporated with graphene oxide and titanium dioxide nanoparticles to remove anionic contaminants from wastewater.

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“…Additionally, these nano-sized metals based absorbents were also robust for Cr(VI) removal at relatively low Cr(VI) concentrations ( Table 1 ). Nano-sized metal oxides, such as thorium oxide [ 96 ], titanium oxide [ 97 ], zinc oxide [ 98 ], manganese oxide [ 99 ], and ferric oxide [ 100 ], have also been used for Cr(VI) removal due to their vast surface area, high capacity and selectivity. However, the treatment performances of these sole metal oxides are far from ideal.…”

Section: Polymers Used For Cr(vi) Removalmentioning

confidence: 99%

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

Yuan

Luo

et al. 2023

Polymers

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Sorptive removal of hexavalent chromium (Cr(VI)) bears the advantages of simple operation and easy construction. Customized polymeric materials are the attracting adsorbents due to their selectivity, chemical and mechanical stabilities. The mostly investigated polymeric materials for removing Cr(VI) were reviewed in this work. Assembling of robust functional groups, reduction of self-aggregation, and enhancement of stability and mechanical strength, were the general strategies to improve the performance of polymeric adsorbents. The maximum adsorption capacities of these polymers toward Cr(VI) fitted by Langmuir isotherm model ranged from 3.2 to 1185 mg/g. Mechanisms of complexation, chelation, reduction, electrostatic attraction, anion exchange, and hydrogen bonding were involved in the Cr(VI) removal. Influence factors on Cr(VI) removal were itemized. Polymeric adsorbents performed much better in the strong acidic pH range (e.g., pH 2.0) and at higher initial Cr(VI) concentrations. The adsorption of Cr(VI) was an endothermic reaction, and higher reaction temperature favored more robust adsorption. Anions inhibited the removal of Cr(VI) through competitive adsorption, while that was barely affected by cations. Factors that affected the regeneration of these adsorbents were summarized. To realize the goal of industrial application and environmental protection, removal of the Cr(VI) accompanied by its detoxication through reduction is highly encouraged. Moreover, development of adsorbents with strong regeneration ability and low cost, which are robust for removing Cr(VI) at trace levels and a wider pH range, should also be an eternally immutable subject in the future. Work done will be helpful for developing more robust polymeric adsorbents and for promoting the treatment of Cr(VI)-containing wastewater.

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Fabrication of novel magnetic chitosan/graphene-oxide/metal oxide nanocomposite beads for Cr(VI) adsorption

Cited by 24 publications

References 62 publications

Retracted: Advances in chitosan biopolymer composite materials: from bioengineering, wastewater treatment to agricultural applications

Retracted: Advances in chitosan biopolymer composite materials: from bioengineering, wastewater treatment to agricultural applications

Chitosan Beads Incorporated with Graphene Oxide/Titanium Dioxide Nanoparticles for Removing an Anionic Dye

Advances in Sorptive Removal of Hexavalent Chromium (Cr(VI)) in Aqueous Solutions Using Polymeric Materials

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