Synthesis and characterization of graphene oxide sheets integrated with gold nanoparticles and their applications to adsorptive removal and catalytic reduction of water contaminants

Naeem, Hina; Ajmal, Muhammad; Muntha, Sedra Tul; Ambreen, Jaweria; Siddiq, Muhammad

doi:10.1039/c7ra12030c

Cited by 75 publications

(35 citation statements)

References 55 publications

(81 reference statements)

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“…Other studies are those reported by Liao et el. [4] (microwave modified bamboo charcoal), Rafatullah et al [5] (low cost adsorbent), Malana et al [6] (polymeric gels), El Qada et al [7] (activated carbon), Annadura et al [1] (cellulose-based waste), Malik [8] (activated carbon from wood sawdust), Halder et al [9] (thermally modified granular charcoal), Onai [10] (activated carbon prepared from apricot waste), Perira et al [11] (carbons), Tahir and Rauf [12] (bentonite clay), Vega-Negron et al [13] (chitosan/cellulose beads), Beheshti et al [14] (supramolecular complex) , Naeem et al [15] (graphene oxide sheets integrated with gold nanoparticles), Ogata et al [16] (poly-y-glutamic acid), El Alouani et al [17] (fly ashbased geopolymer), Adeyemo et al [18] (clay), etc. However, most of the reported studies on the adsorption of dyes have not paid significant attention on the potential of neem seed as an adsorbent nor fully explored detail mechanism for their adsorption.…”

Section: Introductionmentioning

confidence: 99%

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Odoemelam

Emeh

Eddy

2018

Journal of Taibah University for Science

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Adsorption of methylene blue and malachite green dyes from aqueous solution by neem leaves was studied using experimental and computational chemistry approaches. The two dyes have N-H stretch, C≡C vibration vibration, C=C stretch and C-Cl stretch as common functional groups. Batch adsorption experiments were concluded by measuring absorbance (at wavelength of maximum absorption, i.e. 660 and 630 nm for methylene blue and malachite green dyes, respectively). The adsorption of the dyes on neem leaves favoured Langmuir and Temkin isotherms and was influenced by concentration, biomass dose, pH and by contact time, and favoured chemisorption mechanism. Although surface adsorption and intra particle diffusion were identified as the rate-limiting steps, a pseudo second-order kinetics was also favoured. Quantum chemical analysis supported better adsorption of methylene blue dye on neem seed surface than malachite green dye and through Fukui function analysis, the site for adsorption of the dyes was proposed.ARTICLE HISTORY

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Section: Introductionmentioning

confidence: 99%

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Odoemelam

Emeh

Eddy

2018

Journal of Taibah University for Science

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“…Naeem et al 61 integrated Au-NP onto GO sheets using modified Hummer's sol-gel technique. The procedure followed the usual technique as described by Hurtado et al 60 The morphology and photocatalytic water splitting applications showed encouraging potential.…”

Section: Sol-gel Techniquementioning

confidence: 99%

Graphene oxide/Au nanoparticles: Synthesis, properties, and application: A mini‐review

2021

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There has been rapid growth in research activities on the potential of graphene oxide/Au (GO:Au) composite for different applications. The GO:Au composite has been widely explored in applications such as biomedicine, electrochemical biosensors, optical limiters, and organic dye degradation. The increased interest in GO:Au for these applications is the consequence of harvesting the electronic bonding structure that is due to the formation of sp 3 C C clusters from defected sp 2 C═C and attachment of Au atoms onto the C═C carbon matrix.The defection of the sp 2 cluster of GO can be achieved by the method of improved synthesis and functionalization with Au surfactants. The current review explores an overview of the different synthesis techniques for producing GO:Au composites, which is an important factor in controlling the particle and size distribution of the composites. The electronic, electrical, and magnetic properties of GO:Au composites are covered as it relates to photochemical, memristive, and biomedical imaging applications. The low coercivity and remanence are consistent with superparamagnetic behavior. Although, GO:Aunanocomposite (NC) are widely explored for biomedicine and drug delivery applications, future applications of the composite can be useful for magnetic resonance imaging owing to the superparamagnetic behavior. The future possibilities of GO:Au-NP are promising in the field of bioimaging and electronic devices. The electrical property of GO:Au-NC can be fused with its electrochemical property for supercapacitor applications. In some cases, GO:Au-NC is used as an anchor material with conducting polymers to enhance the supercapacitor properties. Furthermore, the synthesis of mono-disperse few-layer graphene is still challenging owing to economic cost and the graphite exfoliation process. The review of GO:Au composite from a material physics perspective aims to elucidate the current trends as well the future possibilities offered by the composite for various promising applications. Novelty Statement• This review focused on the graphene oxide-gold nanocomposite which is an outstanding composite material for different applications.

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“…The distribution coefficient (K d ) used for assessing the actual performance of the prepared adsorbents was determined by this equation [41,42]:…”

Section: Adsorption Testsmentioning

confidence: 99%

Effective Elimination of Contaminant Antibiotics Using High-Surface-Area Magnetic-Functionalized Graphene Nanocomposites Developed from Plastic Waste

et al. 2020

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The presence of pharmaceutical residues in aquatic environments represents a risk for the equilibrium of the ecosystem and may seriously affect human safety itself in the long term. To address this issue, we have synthesized functional materials based on highly-reduced graphene oxide (HRGO), sulfonated graphene (SG), and magnetic sulfonated graphene (MSG). The method of synthesis adopted is simple and inexpensive and makes use of plastic bottle waste as the raw material. We have tested the fabricated materials for their adsorption efficiency against two model antibiotics in aqueous solutions, namely Garamycin and Ampicillin. Our tests involved the optimization of different experimental parameters of the adsorption process, such as starting antibiotic concentration, amount of adsorbent, and time. Finally, we characterized the effect of the antibiotic adsorption process on common living organisms, namely Escherichia coli DH5α (E. coli DH5α) bacteria. The results obtained demonstrate the efficiency of the method in addressing the issue of the emergence of antibiotic-resistant bacteria, which will help in preventing changes in the ecosystem.

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Synthesis and characterization of graphene oxide sheets integrated with gold nanoparticles and their applications to adsorptive removal and catalytic reduction of water contaminants

Abstract: Preparation of graphene oxide–gold (GO–Au) nanocomposites as adsorbents and catalysts for decontamination of water.

Cited by 75 publications

References 55 publications

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Experimental and computational chemistry studies on the removal of methylene blue and malachite green dyes from aqueous solution by neem (Azadirachta indica) leaves

Graphene oxide/Au nanoparticles: Synthesis, properties, and application: A mini‐review

Effective Elimination of Contaminant Antibiotics Using High-Surface-Area Magnetic-Functionalized Graphene Nanocomposites Developed from Plastic Waste

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