Gum kondagogu reduced/stabilized silver nanoparticles as direct colorimetric sensor for the sensitive detection of Hg2+ in aqueous system

Rastogi, Lori; Sashidhar, R.B.; Karunasagar, D.; Arunachalam, J.

doi:10.1016/j.talanta.2013.10.012

Cited by 115 publications

(51 citation statements)

References 31 publications

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“…However, it is a well-established fact that the physical and chemical properties at nanoscale are far different from those of the bulk owing to the quantization effect. (39,41,42) It is known that the redox potential of the M X+ /M 0 couple is very different from that of the corresponding M X+ /M metal couple. In this redox reaction, such unexpected rapid redox reaction between the zero-valent Ag 0 and the divalent Hg 2+ occurs owing to the nanoscale nature of AgNPs, which heightens the effective variation between the Ag + /Ag nano and Hg 2+ /Hg redox potentials and would favor the reduction of Hg 2+ to Hg 0 with the partial oxidation of Ag 0 .…”

Section: Agnp-based Detection Of Hg 2+mentioning

confidence: 99%

“…In this redox reaction, such unexpected rapid redox reaction between the zero-valent Ag 0 and the divalent Hg 2+ occurs owing to the nanoscale nature of AgNPs, which heightens the effective variation between the Ag + /Ag nano and Hg 2+ /Hg redox potentials and would favor the reduction of Hg 2+ to Hg 0 with the partial oxidation of Ag 0 . (18,21,39,(43)(44)(45) Owing to the high affinity between Ag 0 and Hg 0 , the reduced Hg 0 gets deposited onto the Ag surface, resulting in the formation of the Hg-Ag alloy. (18,21,43,44) This further results in a decreased intensity and blue shift.…”

Section: Agnp-based Detection Of Hg 2+mentioning

confidence: 99%

“…(37,38) The FTIR spectra of the ginseng showed a peak at 211 1740 cm −1 , due to the carbonyl stretching vibrations of the aldehyde. (12,39) The decrease in peak intensity at 1740 cm −1 and the increase in peak intensity at 1640 and 1407 cm −1 (for symmetric and asymmetric -COO stretching vibrations, respectively) of ginseng-stabilized AgNPs indicate the significant role of -CHO in the reduction of Ag + . (12,39) A peak at 2988 cm −1 was assigned to the stretching vibrations of C-H in methyl and methylene groups.…”

mentioning

confidence: 99%

“…(12,39) The decrease in peak intensity at 1740 cm −1 and the increase in peak intensity at 1640 and 1407 cm −1 (for symmetric and asymmetric -COO stretching vibrations, respectively) of ginseng-stabilized AgNPs indicate the significant role of -CHO in the reduction of Ag + . (12,39) A peak at 2988 cm −1 was assigned to the stretching vibrations of C-H in methyl and methylene groups. (38,40) 1065 cm −1 was assigned to the bending vibrations of C-C-O or C-C-OH.…”

mentioning

confidence: 99%

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Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Tagad¹,

Hyun²,

Rucha³

et al. 2017

Sensors and Materials

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Exploring biomaterials/molecules as a reducing/capping agent for the synthesis of metal nanoparticles has set a new trend in green nanotechnology with improved environmental safety. Herein, a facile, one-pot, and green synthesis of silver nanoparticles (AgNPs) was achieved using Panax ginseng root extract that was obtained from the root powder as a cost-effective and environmentfriendly biomaterial. Optical, functional, and morphological characteristics of the synthesized AgNPs were determined using ultraviolet-visible (UV-vis), Fourier transform infrared (FTIR) spectrophotometers, transmission electron microscopy (TEM), and atomic force microscopy (AFM). The synthesized AgNPs were used for the detection of Hg 2+ by obtaining the absorption spectrum of the compound as a function of Hg 2+ concentration, which resulted in a decrease in absorption peak intensity with a slight blue shift. The AgNP solution decolored upon dissolution due to the formation of an Ag-Hg amalgam. The sensing characteristics were found to be linear when tested from 10 µM to 1 mM Hg 2+ concentration and the detection limit was estimated as 5 µM. To check the selectivity of the sensor towards Hg 2+ , the sensor response was measured for different heavy metals such as K + , Na + , Cu 2+ , Ni 2+ , Ca 2+ , Zn 2+ , Mg 2+ , and Mn 2+ , at 10 mM concentrations.

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Section: Agnp-based Detection Of Hg 2+mentioning

confidence: 99%

Section: Agnp-based Detection Of Hg 2+mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Tagad¹,

Hyun²,

Rucha³

et al. 2017

Sensors and Materials

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show abstract

“…Particularly, silver nanoparticles (AgNPs) show significant applications in bio imaging, catalysis, colorimetric sensors, drug delivery, surface-enhanced Raman scattering, etc. [10][11][12][13]. The AgNPs in the colloidal state have widely been used to research the catalytic action in the model reaction is electron exchange reaction between hexacyanoferrate(III) to hexacyanoferrate(II) [14,15].…”

Section: Introductionmentioning

confidence: 99%

Microwave-assisted synthesis of silver nanoparticles and their application in catalytic, antibacterial and antioxidant activities

Seku¹,

et al. 2018

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Eco-friendly silver nanoparticles (AgNPs) were synthesized using a carboxymethylated gum kondagogu (CMGK) as capping and reducing agent by microwave irradiation method. Synthesized AgNPs were analyzed by TEM, showed spherical in shape with an average particle size distribution of 9 ± 2 nm. XRD results showed that the cubic-structured AgNPs with crystallite size of 8.6 nm. The synthesized CMGK capped AgNPs was tested for catalytic activity using hexacyanoferrate(III) in the presence of NaBH 4 and the impacts of catalyst dose and temperature were examined. The synthesized AgNPs demonstrated a huge antibacterial action on both Gram-positive and negative groups of microorganisms with inhibition zone of 23, 25 and 28 mm, respectively, for Bacillus subtilis, Bacillus cereus and Escherichia coli, they showed moderate antibacterial action (zone of inhibition 15 mm) with Pseudomonas aeruginosa. In addition, the ability of the AgNPs scavenging activity with different concentrations was studied using the DPPH radical scavenging.

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Green Synthesis of Silver Nanoparticles for Biomedical and Environmental Applications

Varadavenkatesan

Vinayagam

Selvaraj

2018

Green Metal Nanoparticles

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Gum kondagogu reduced/stabilized silver nanoparticles as direct colorimetric sensor for the sensitive detection of Hg2+ in aqueous system

Cited by 115 publications

References 31 publications

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Green Synthesis of Silver Nanoparticles Using Panax Ginseng Root Extract for the Detection of Hg2+

Microwave-assisted synthesis of silver nanoparticles and their application in catalytic, antibacterial and antioxidant activities

Green Synthesis of Silver Nanoparticles for Biomedical and Environmental Applications

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