Fabrication and antibacterial activity against Pseudomonas aeruginosa and Staphylococcus aureus of silver nanoparticle decorated reduced graphene oxide nanocomposites

Dat, Nguyen Minh; Linh, Vu Ngoc Phuong; Huy, Le Anh; Hương, Nguyễn Thanh; Tu, Tran Hoang; Phuong, Nguyen Thi Lien; Nam, Hoàng Minh; Phong, Mai Thanh; Hieu, Nguyen Huu

doi:10.1080/10667857.2019.1575555

Cited by 33 publications

(9 citation statements)

References 24 publications

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“…Such impurities or defects could induce additional crystalline phases and contribute to the broadening of the diffraction peaks. The crystal structure of Ag-rGO has been identified, and the reduction of peak at 2θ = 20° is due to the surface covered Ag NPs, which inhibited the stacking of rGO nanosheets . According to the previous report, the diffraction peak of GO at 2θ = 11° corresponds to an interlayer spacing of 0.83 nm.…”

Section: Resultsmentioning

confidence: 99%

“…The crystal structure of Ag-rGO has been identified, and the reduction of peak at 2θ = 20°is due to the surface covered Ag NPs, which inhibited the stacking of rGO nanosheets. 58 According to the previous report, 59 the diffraction peak of GO at 2θ = 11°corresponds to an interlayer spacing of 0.83 nm. The characteristic XRD peak of GO in Ag-rGO disappeared, and an additional broad peak appeared at 2θ = 38°.…”

Section: Structural Morphology and Chemical Compositionmentioning

confidence: 99%

“…The morphology and folded sheets of Ag-rGO are like those of rGO, except that spherical shaped Ag nanoparticles are evenly dispersed across the surface of rGO sheets, leading to a rougher surface. 58 This surface is well suited for the adsorption of hazardous organic contaminants such as dyes 1 indicated in Figure 2c. Finally, Figure 2d shows the sequential structure of virgin nanostructured Ag particles with some aggregation among them.…”

Section: Structural Morphology and Chemical Compositionmentioning

confidence: 99%

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Effective Removal of Nile Blue Dye from Wastewater using Silver-Decorated Reduced Graphene Oxide

Natasha,

Khan,

Rahman

et al. 2024

ACS Omega

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Nile blue (NB) dye is a highly toxic substance that when discharged into sewage presents a significant risk to the environment and human health. Carbon-based nanomaterials, such as graphene oxide (GO), reduced graphene oxide (rGO), and their nanocomposites, offer considerable potential for eliminating hazardous pollutants from aqueous systems. In this study, we have successfully fabricated bare GO and rGO, and then, the rGO was decorated with silver (Ag) nanoparticles to develop the Ag-rGO composite. The as-prepared materials were characterized by various techniques, such as UV–visible (UV–vis) and Fourier transform infrared (FTIR) spectroscopies, X-ray diffraction (XRD), energy-dispersive X-ray (EDX), and scanning electron microscopy (SEM) to elucidate their structure, morphology, and chemical composition. The pollutant removal performance of the as-prepared materials was evaluated through a batch approach under the effect of various experimental variables for removal of NB dye from wastewater. As obvious, the Ag-rGO composite revealed exceptional performance for NB dye removal from wastewater, with a maximum removal percentage of 94% within 60 min, which is remarkably higher than those of the rGO (i.e., 59%) and GO (i.e., 22%), under the same experimental conditions. The adsorption data was analyzed with thermodynamics, isotherms, and kinetics models to better understand the physicochemical mechanisms driving the effective removal of the NB dye. The results reveal that Ag-rGO nanocomposite exhibit excellent adsorption ability as well as favorable thermodynamic and kinetic parameters for NB dye removal. It was also found that the presence of light enhanced the adsorptive removal of NB while using Ag-rGO as an adsorbent. The present study noted significant reusability of the Ag-rGO nanocomposite, likely due to minimal Ag leaching and/or the robust stability of the Ag-rGO. It is suggested that Ag-rGO-based hybrid materials could serve as promising candidates for efficiently adsorbing and catalytically removing various toxic pollutants from wastewater.

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Section: Resultsmentioning

confidence: 99%

Section: Structural Morphology and Chemical Compositionmentioning

confidence: 99%

Section: Structural Morphology and Chemical Compositionmentioning

confidence: 99%

See 1 more Smart Citation

Effective Removal of Nile Blue Dye from Wastewater using Silver-Decorated Reduced Graphene Oxide

Natasha,

Khan,

Rahman

et al. 2024

ACS Omega

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“…However, after precipitation on the surface of GO sheets, the main size of Ag NPs decreased to 9-12 nm with almost no aggregation ( Figure 5C, D, and F), because GO prevented nanoparticles from aggregation better than PVP. 61 Ag NPs of such size are able to attach to the surface of the bacteria and even penetrate the cell wall. 20 We found 49 that GO nanosheets show toxicity on different Gram-positive and Gram-negative bacterial strains, including microencapsulation ability.…”

Section: Discussionmentioning

confidence: 99%

Effect of Graphene Oxide and Silver Nanoparticles Hybrid Composite on P. aeruginosa Strains with Acquired Resistance Genes

Lozovskis

Jankauskaitė

Guobienė

et al. 2020

IJN

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Background: In the last decades, nosocomial infections caused by drug-resistant Pseudomonas aeruginosa became a common problem in healthcare facilities. Antibiotics are becoming less effective as new resistant strains appear. Therefore, the development of novel enhanced activity antibacterial agents becomes very significant. A combination of nanomaterials with different physical and chemical properties enables us to generate novel multi-functional derivatives. In this study, graphene oxide and polyvinylpyrrolidonestabilized silver nanoparticles hybrid nanocomposite (GO-Ag HN) were synthesized. The relation between antibiotic resistance and GO-Ag HN potential toxicity to clinical P. aeruginosa strains, their antibiotic resistance, and molecular mechanisms were assessed. Methods: Chemical state, particle size distribution, and morphology of synthesized GO-Ag NH were investigated using spectroscopy and microscopy techniques (UV-Vis, FTIR, XPS, TEM, SEM, AFM). Broad-spectrum antibiotic resistance of P. aeruginosa strains was determined using E-test. Antibiotic resistance genes were identified using polymerase chain reaction (PCR). Results: In this study, the toxicity of the GO-Ag NH to the isolated clinical P. aeruginosa strains has been investigated. A high antibiotic resistance level (92%) was found among P. aeruginosa strains. The most prevalent antibiotic resistance gene among tested strains was the AMPC betalactamase gene (65.6%). UV-vis, FTIR, and XPS studies confirmed the formation of the silver nanoparticles on the GO nanosheets. The functionalization process occurred through the interaction between Ag nanoparticles, GO, and polyvinylpyrrolidone used for nanoparticle stabilization. SEM analysis revealed that GO nanosheets undergo partial fragmentation during hybrid nanocomposite preparation, which remarkably increases the number of sharp edges and their mediated cutting effect. TEM analysis showed that GO-Ag HN spherical Ag nanoparticles mainly 9-12 nm in size were irregularly precipitated on the GO nanosheet surface. A higher density of Ag NPs was observed in the sheets' wrinkles, corrugations, and sharp edges. This hybrid nanocomposite poses enhanced antibacterial activity against carbapenem-resistant P. aeruginosa strains through a possible synergy between toxicity mechanisms of GO nanosheets and Ag nanoparticles. With incubation time increasing up to 10 minutes, the survival of P. aeruginosa decreased significantly. Conclusion: A graphene oxide and silver nanoparticles hybrid composite has been shown to be a promising material to control nosocomial infections caused by bacteria strains resistant to most antibiotics.

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“…The defect of the material was represented by the (ID/IG) intensity ratio. According to Figure 3c, ID/IG ratio for MnFe2O4/graphene oxide nanocomposite is 1.13 that is higher than that of graphene oxide (which is equal to 0.94), indicating the interaction between graphene oxide's oxygen groups and manganese ferrite nanoparticles [49]. This interaction is responsible for the increased degree of the defect and causes this difference in peak ratio.…”

Section: Nanocomposite Characterizationmentioning

confidence: 91%

Synthesis of Manganese Ferrite/Graphene Oxide Magnetic Nanocomposite for Pollutants Removal from Water

et al. 2021

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These days, environmental pollution, notably water pollution, has increasingly caused severe human health problems. The major water pollutants are heavy metals. MnFe2O4/GO nanocomposite was prepared in the current work via in situ method and tested to remove lead ion Pb2+ and neutral red (NR) dye from water. The prepared nanocomposite was characterized using different techniques, including X-ray diffraction, transmission electron microscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, Raman spectra, and vibrating sample magnetometer. The prepared nanocomposite showed high adsorption capacity toward Pb2+ and NR dye removal according to Langmuir fitting indicating the monolayer homogeneous adsorption of pollutants over the adsorbent surface and can be separated easily with an external magnet. The effect of different factors, including contact time, pH, initial concentration, and adsorbent dose on the adsorption, were also studied. The increased concentration of pollutants led to increased adsorption capacity from 63 to 625 mg/g for Pb2+ ions and from 20 to 90 mg/g for NR dye. The increased adsorbent dose led to increased removal efficiency from 39% to 98.8% and from 63% to 94% for Pb2+ and NR dye, respectively. The optimum pH for the adsorption of both pollutants was found to be 6.0. The reusability of MnFe2O4/GO nanocomposite was studied for up to five cycles. The nanocomposite can keep its efficiency even after the studied cycles. So, the prepared magnetic nanocomposite is a promising material for water treatment.

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Fabrication and antibacterial activity against Pseudomonas aeruginosa and Staphylococcus aureus of silver nanoparticle decorated reduced graphene oxide nanocomposites

Cited by 33 publications

References 24 publications

Effective Removal of Nile Blue Dye from Wastewater using Silver-Decorated Reduced Graphene Oxide

Effective Removal of Nile Blue Dye from Wastewater using Silver-Decorated Reduced Graphene Oxide

<p>Effect of Graphene Oxide and Silver Nanoparticles Hybrid Composite on P. aeruginosa Strains with Acquired Resistance Genes</p>

Synthesis of Manganese Ferrite/Graphene Oxide Magnetic Nanocomposite for Pollutants Removal from Water

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