Removal of malachite green dye from aqueous solution using reduced graphene oxide as an adsorbent

Rout, Dibya Ranjan; Jena, Hara Mohan

doi:10.1016/j.matpr.2021.03.406

Cited by 48 publications

(15 citation statements)

References 36 publications

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“…For example, the adsorption capacities of the activated carbon samples studied are higher than those for chitosan–montmorillonite/polyaniline nanocomposite [ 34 ] and commercial activated carbon CWZ-22, but lower than for NORIT SX2 [ 35 ]. The adsorption capacities towards malachite green exceeded those for the composites of cellulose nanofiber and silver nanoparticles [ 36 ], reduced graphene oxide [ 37 ], and carbon obtained from date stones [ 38 ]. It should be also mentioned that the costs of adsorbents described in [ 36 , 37 , 38 ] are by far higher than those of obtaining activated carbons from marigold flowers.…”

Section: Resultsmentioning

confidence: 99%

“…The adsorption capacities towards malachite green exceeded those for the composites of cellulose nanofiber and silver nanoparticles [ 36 ], reduced graphene oxide [ 37 ], and carbon obtained from date stones [ 38 ]. It should be also mentioned that the costs of adsorbents described in [ 36 , 37 , 38 ] are by far higher than those of obtaining activated carbons from marigold flowers. The carbon samples obtained by us showed much lower adsorption capacities towards crystal violet than the adsorbents obtained from agricultural rice bran waste [ 39 ].…”

Section: Resultsmentioning

confidence: 99%

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Removal of Organic Dyes from Aqueous Solutions by Activated Carbons Prepared from Residue of Supercritical Extraction of Marigold

et al. 2022

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In the present work, we reported on the efficiency of the removal of organic dyes by adsorption on activated carbons prepared from the residue of supercritical extraction of marigold. The performance of adsorbents prepared was tested towards methyl red, methylene blue, malachite green, and crystal violet at room temperature. The effects of carbonization (500 and 700 °C) and activation (700 and 800 °C) temperatures, textural parameters, and acid-base character of the adsorbent surface on the sorption properties of the activated carbons were established. Activated carbons are characterized by low developed specific surface area, from 2 to 206 m2/g, and have a basic character of the surface (pH of carbons water extracts ranging from 10.4 to 11.2). Equilibrium adsorption isotherms were investigated. The equilibrium data were analyzed in the Langmuir, Freundlich, and Temkin models. The adsorption capacities of activated carbons studied varied from 47.62 to 102.43 mg/g towards methyl red, 53.14 to 139.72 mg/g towards methyl red, 425.46 to 622.80 towards malachite green and 155.91 to 293.75 mg/g towards crystal violet, from their water solutions. Kinetics of the adsorption of the organic dyes studied were found to be described by the pseudo-second-order model. It was proven that through the physical activation of the residue of supercritical extraction of marigold, it is possible to obtain carbonaceous materials of very high adsorption capacity towards organic pollutants.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Removal of Organic Dyes from Aqueous Solutions by Activated Carbons Prepared from Residue of Supercritical Extraction of Marigold

et al. 2022

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“…It is observed from Figure 1a that in GO, the sheets are stuck together because of the oxygen‐containing functional groups, randomly aggregated, rough surface, heterogeneous surface structure, wrinkles are present, and the sheets are thin. [ 31 ] The FESEM image of RGO (Figure 1b) shows the wrinkled paper‐like structure, corrugated surface, less aggregate, and irregular structure. [ 32 ] These changes in surface morphology occur in RGO is due to the elimination of oxygenated functional groups from the RGO surface.…”

Section: Resultsmentioning

confidence: 99%

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

Rout

Jena

2022

J Chinese Chemical Soc

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In this study, the reduced form of graphene oxide (RGO) has been synthesized by using hydrazine hydrate as a reducing agent and used for Cr(VI) removal. The physicochemical properties of the as‐synthesized material were studied by FESEM, XRD, RAMAN, and FTIR. The optimized adsorption parameters were time of 75 min, solution pH 3.0, temperature 35°C, and dosage of 0.3 g/l. The isotherms were perfectly simulated by the Langmuir model, and the kinetic data followed the pseudo‐second‐order model. The maximum uptake capacity was 787.401 mg/g at 35°C. Thermodynamic analysis indicated an endothermic and spontaneous process occurs. Competition from interfering ions (SO42−, NO3−, Cl−, HCO3−, Co2+, and Cu2+) proved insignificant. After five cycles of regeneration, the removal remains at 85.75%. From the column study, it was observed that the parameters like breakthrough time (tb), bed capacity (qbed), and exhaustion time (te) increase with an increase in bed height and decrease with an increase in Cr(VI) flow rate. Adsorption performance for industrial effluents shows up to 55.32% removal. The above superior adsorption performance validated the application of the RGO as an efficient adsorbent for the remediation of Cr(VI) ions from wastewater.

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“…Thus, it is expected that on the surface of rGO, there are eventually hydroxyl and epoxide groups, with only a partial reduction of GO. However, the main differences between GO and rGO are the predominance of carboxyl’s, many defects, and lower oxygen content in the reduced form [ 63 ]. Recently, Ansari and Siddiqui [ 64 ] have used Ficus carica , to promote the deoxygenation of graphene oxide with good results (Fig.…”

Section: Reviewmentioning

confidence: 99%

Graphene and its derivatives: understanding the main chemical and medicinal chemistry roles for biomedical applications

et al. 2021

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Graphic abstract Over the past few years, there has been a growing potential use of graphene and its derivatives in several biomedical areas, such as drug delivery systems, biosensors, and imaging systems, especially for having excellent optical, electronic, thermal, and mechanical properties. Therefore, nanomaterials in the graphene family have shown promising results in several areas of science. The different physicochemical properties of graphene and its derivatives guide its biocompatibility and toxicity. Hence, further studies to explain the interactions of these nanomaterials with biological systems are fundamental. This review has shown the applicability of the graphene family in several biomedical modalities, with particular attention for cancer therapy and diagnosis, as a potent theranostic. This ability is derivative from the considerable number of forms that the graphene family can assume. The graphene-based materials biodistribution profile, clearance, toxicity, and cytotoxicity, interacting with biological systems, are discussed here, focusing on its synthesis methodology, physicochemical properties, and production quality. Despite the growing increase in the bioavailability and toxicity studies of graphene and its derivatives, there is still much to be unveiled to develop safe and effective formulations.

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Removal of malachite green dye from aqueous solution using reduced graphene oxide as an adsorbent

Cited by 48 publications

References 36 publications

Removal of Organic Dyes from Aqueous Solutions by Activated Carbons Prepared from Residue of Supercritical Extraction of Marigold

Removal of Organic Dyes from Aqueous Solutions by Activated Carbons Prepared from Residue of Supercritical Extraction of Marigold

Batch and continuous studies on adsorptive removal of hexavalent chromium [Cr(VI)] using reduced graphene oxide

Graphene and its derivatives: understanding the main chemical and medicinal chemistry roles for biomedical applications

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