Electrochemical heavy metal detection, photocatalytic, photoluminescence, biodiesel production and antibacterial activities of Ag–ZnO nanomaterial

Nagaraju, G.; Udayabhanu,; Shivaraj,; Prashanth, S. A.; Shastri, Mahesh; Yathish, K.V.; Anupama, C.; Rangappa, Dinesh

doi:10.1016/j.materresbull.2017.05.043

Cited by 371 publications

(134 citation statements)

References 50 publications

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“…HRTEM image (Fig. 9b) of Ag NPs reveals that interplanar spacing of 0.14 nm corresponds to growing direction of Ag along (111) [40]. Selected area electron diffraction (SAED) pattern indicates the presence of (111), (200) and (220) planes in Ag NPs (Fig.…”

Section: Uv-vis Spectroscopymentioning

confidence: 97%

Enhanced photocatalysis, photoluminescence, and anti-bacterial activities of nanosize Ag: green synthesized via Rauvolfia tetraphylla (devil pepper)

Vinay

Udayabhanu²,

Nagarju³

et al. 2019

SN Appl. Sci.

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In the current study, we have built up a novel, green approach technique for the synthesis of silver nanoparticles (Ag NPs) from Rauvolfia tetraphylla leaves extract. The synthesized nanoparticles were thoroughly characterized using different analytical techniques like X-ray diffraction, Fourier transform infrared spectroscopy, UV-Vis spectroscopy (UV-Vis), scanning electron microscopy, energy-dispersive X-ray spectroscopy and transmission electron microscope analysis. It is confirmed as a cubic phase with average particle size about 40 nm with a spherical shape. Further, the characterized material was inspected for the photocatalytic degradation of most common environmental pollutants (carcinogenic organic dyes) like Methylene blue (M.B), Rhodamine B (Rh. B) and Rose bengal (R.B) with degradation efficiency of 81, 55 and 80% respectively. In addition, it was examined by optical property (photoluminescence) with blue emission by the excitation at 370 to 400 nm, which is useful for blue LEDs (light emitting diode). Furthermore, it also shows the superior anti-bacterial activity against gram-positive bacterias such as Pseudomonas aeruginosa, Escherichia coli and Klebsiella aerogenes and gram-negative bacteria Staphylococcus aureus. Ag NPs synthesized using Rauvolfia tetraphylla leaf extract exhibited a good photocatalytic and antibacterial activity. Hence, it's a first to report the synthesis of Ag NPs using natural reducing agent Rauvolfia tetraphylla leaf extract for Luminescence and Dye degradation applications.

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Section: Uv-vis Spectroscopymentioning

confidence: 97%

Enhanced photocatalysis, photoluminescence, and anti-bacterial activities of nanosize Ag: green synthesized via Rauvolfia tetraphylla (devil pepper)

Vinay

Udayabhanu²,

Nagarju³

et al. 2019

SN Appl. Sci.

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“…The photocatalytic activity of Ag/ZnO nanocomposites could also contribute to enhancing antimicrobial activity. Nagaraju et al [65] indicated an improvement of antimicrobial activity of Ag-ZnO NPs against both E. coli and S. aureus bacteria compared to pure materials. The inhibition zone could be observed at a concentration of 500 µg Ag-ZnO NPs.…”

Section: Characterization Of Prepared Ag/tio2 and Ag/zno Nanoparticlesmentioning

confidence: 99%

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Nguyen¹,

Vu²,

Nguyen³

et al. 2019

J. Compos. Sci.

105

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This work emphasizes the use of the silver decorative method to enhance the antibacterial activity of TiO2 and ZnO nanoparticles. These silver-decorated nanoparticles (hybrid nanoparticles) were synthesized using sodium borohydride as a reducing agent, with the weight ratio of Ag precursors/oxide nanoparticles = 1:30. The morphology and optical properties of these hybrid nanoparticles were investigated using transmission electron microscopy (TEM), X-ray diffraction (XRD) patterns, and UV-Vis spectroscopy. The agar-well diffusion method was used to evaluate their antibacterial activity against both Staphylococcus aureus and Escherichia coli bacteria, with or without light irradiation. The TEM images indicated clearly that silver nanoparticles (AgNPs, 5–10 nm) were well deposited on the surface of nano-TiO2 particles (30–60 nm). In addition to this, bigger AgNPs (<20 nm) were dispersed on the surface of nano-ZnO particles (30–50 nm). XRD patterns confirmed the presence of AgNPs in both Ag-decorated TiO2 and Ag-decorated ZnO nanoparticles. UV-Vis spectra confirmed that the hybridization of Ag and oxide nanoparticles led to a shift in the absorption edge of oxide nanoparticles to the lower energy region (visible region). The antibacterial tests indicated that both oxide pure nanoparticles did not exhibit inhibitory effects against bacteria, with or without light irradiation. However, the presence of AgNPs in their hybrids, even at low content (<40 mg/mL), leads to a good antibacterial activity, and higher inhibition zones under light irradiation as compared to those in dark were observed.

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“…The emission peaks obtained are in UV and visible region and could be attributed to bound excitons and defect states located on the surface of nanostructured pure and doped ZnO Nps. Figure 16a shows a PL excitation spectrum with emission at 542 nm [48,49]. The color coordinates are used to find out the emission color of the material.…”

Section: Photoluminescence Studymentioning

confidence: 99%

Highly porous, honeycomb like Ag–ZnO nanomaterials for enhanced photocatalytic and photoluminescence studies: green synthesis using Azadirachta indica gum

Basavalingiah

Harishkumar

Udayabhanu³

et al. 2019

SN Appl. Sci.

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The preparation of zinc oxide and silver doped zinc oxide nanoparticles using zinc nitrates and silver nitrates as oxidizers and Azadirachta indica gum as a fuel via solution combustion method at 500 °C. The synthesized nanoparticles were characterized by XRD, FTIR, UV-DRS, SEM and TEM studies; these materials were tested for photoluminescence and photocatalytic activity studies. The PXRD data indicated that the synthesized nanoparticles confirmed as hexagonal phase with average crystallite size of 13.33 and 13.34 nm for ZnO and Ag-ZnO respectively. The SEM data revealed that, the material obtained is highly porous and honeycomb like structure. In the photocatalytic degradation of methylene blue, Ag-ZnO nanoparticles have shown the good photocatalytic activity than undoped ZnO nanoparticles. This is due to the presence of Ag on the surface of ZnO catalyst makes the catalyst more sensitive to light and reduce the electron hole recombination. Furthermore, we have also examined the photoluminescence studies for the synthesized materials and it has given the green emission by excitation at 380 nm. In this study, the green synthesis method will produces large quantity of nanomaterials with less time and low cost.

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Electrochemical heavy metal detection, photocatalytic, photoluminescence, biodiesel production and antibacterial activities of Ag–ZnO nanomaterial

Cited by 371 publications

References 50 publications

Enhanced photocatalysis, photoluminescence, and anti-bacterial activities of nanosize Ag: green synthesized via Rauvolfia tetraphylla (devil pepper)

Enhanced photocatalysis, photoluminescence, and anti-bacterial activities of nanosize Ag: green synthesized via Rauvolfia tetraphylla (devil pepper)

Antibacterial Activity of TiO2- and ZnO-Decorated with Silver Nanoparticles

Highly porous, honeycomb like Ag–ZnO nanomaterials for enhanced photocatalytic and photoluminescence studies: green synthesis using Azadirachta indica gum

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