Jyoti Kataria - Academia.edu (original) (raw)

Papers by Jyoti Kataria

Research paper thumbnail of Green biomimetic silver nanoparticles as invigorated colorimetric probe for Hg2+ ions: A cleaner approach towards recognition of heavy metal ions in aqueous media

Materials Chemistry and Physics, 2019

Research paper thumbnail of Evaluation of the kinetic and catalytic properties of biogenically synthesized silver nanoparticles

Journal of Cleaner Production, 2018

Present work encompasses the facile green and biogenic preparation of silver nanoparticles (AgNPs... more Present work encompasses the facile green and biogenic preparation of silver nanoparticles (AgNPs) using of cumin seeds (Cuminum cyminum) extract. The phytochemicals present in seeds extract, possessing strong anti-oxidant potential, reduce silver (Ag þ) ions and subsequently stabilize the newly formed silver (Ag 0) nuclei. The effect of pH, concentration of seeds extract, reaction time and stability of nanoparticles were investigated by UVevisible spectroscopy. The reddish-brown color at a wavelength of 422 nm corresponding to surface plasmon resonance (SPR) absorption, confirmed the formation of AgNPs. Further, the nucleation, growth and stabilization phases have been examined. The rate constant value suggests the rapid formation of stable AgNPs. The nanoparticles were further investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM) and Fourier transform infrared (FT-IR) spectroscopy. The biosynthesized AgNPs had been observed to be spherical in shape with an average particle size of 16 ± 2 nm as calculated from TEM images. Furthermore, the stable AgNPs were excellent nanocatalysts towards borohydride reduction of various anthropogenic dye pollutants viz. methylene blue (MB), methyl red (MR), rhodamine-B (Rh-B) and 4enitrophenol (4eNP).

Research paper thumbnail of Novel Green Biomimetic Approach for Preparation of Highly Stable Au-ZnO Heterojunctions with Enhanced Photocatalytic Activity

ACS Applied Nano Materials, 2018

A simple, ecofriendly, and biomimetic approach using cumin seeds extract (CSE) was developed for ... more A simple, ecofriendly, and biomimetic approach using cumin seeds extract (CSE) was developed for the formation of Au-ZnO Schottky contact without employing any chemical capping agents or stabilizers. The various unique phytoconstituents available in cumin seeds extract synergistically convert Au 3+ ions into Au 0 on the surface of ZnO, as each phytoconstituent is unique in context to its molecular structure and properties. The as-prepared biogenic Au-ZnO hybrid composites were examined using various spectroscopic and microscopic techniques. The TEM investigation and XRD patterns clearly depict the well dispersed AuNPs with the size range 10−15 nm and face centered cubic lattice on wurtzite ZnO nanostructures. The optical study of the nanocomposites showed two absorption bands: one intense band around 390 nm, which corresponds to ZnO, and a second broad band approximately around 540 nm, which corresponds to Au. The photocatalytic efficacy of Au-ZnO nanocatalysts was investigated by observing the mineralization of an aqueous solution of methylene blue (MB) dye under a 200 W tungsten filament lamp as visible light source. The apparent rate constants were also calculated for degradation processes, and it has been observed that 1 and 3 wt % Au-ZnO nanocomposites respectively have 2.27 and 3.2 times higher photoactivity, compared to pure ZnO. This enhanced photoactivity of biogenic Au-ZnO composite materials was resultant from formation of stable and effective Schottky contact between Au metal and ZnO surfaces.

Research paper thumbnail of Green biomimetic preparation of efficient Ag–ZnO heterojunctions with excellent photocatalytic performance under solar light irradiation: a novel biogenic-deposition-precipitation approach

Nanoscale Advances, 2019

A novel biogenic-deposition-precipitation (BDP) approach has been presented for the preparation o... more A novel biogenic-deposition-precipitation (BDP) approach has been presented for the preparation of stable binary composites using fennel seed extract.

Research paper thumbnail of A biomimetic synthesis of stable gold nanoparticles derived from aqueous extract of Foeniculum vulgare seeds and evaluation of their catalytic activity

Applied Nanoscience, 2017

A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extrac... more A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extract of fennel (Foeniculum vulgare) seeds have been reported in this article. The seeds of F. vulgare are rich in various plant secondary metabolites (phytochemicals) such as polyphenolic acids, flavonoids, and saponins. The phytochemicals of F. vulgare seeds play dual role of reducing and stabilizing agents. The formation of gold nanoparticles was evidenced from the appearance of intense purple color at room temperature with k max around 550 nm in the UV-Vis absorption spectra. The stable AuNPs were further characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM) analysis. The synthesized nanoparticles were observed to be polydispersed, spherical and ranged from 10 to 30 nm with an average size of 20 ± 2 nm, as obtained from TEM images. The catalytic activity of gold nanoparticles was investigated by studying the reduction of anthropogenic dyes such as methylene blue (MB) and rhodamine B (Rh-B) with sodium borohydride. Results showed the possible applications of biogenic AuNPs in environment related problems.

Research paper thumbnail of A facile biomimetic preparation of highly stabilized silver nanoparticles derived from seed extract of Vigna radiata and evaluation of their antibacterial activity

Applied Nanoscience, 2015

The significant antibacterial activity of silver nanoparticles draws the major attention toward t... more The significant antibacterial activity of silver nanoparticles draws the major attention toward the present nanobiotechnology. Also, the use of plant material for the synthesis of metal nanoparticles is considered as a green technology. In this context, a non-toxic, eco-friendly, and cost-effective method has been developed for the synthesis of silver nanoparticles using seed extract of mung beans (Vigna radiata). The synthesized nanoparticles have been characterized by UV-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS), and X-ray diffraction (XRD). The UV-visible spectrum showed an absorption peak at around 440 nm. The different types of phytochemicals present in the seed extract synergistically reduce the Ag metal ions, as each phytochemical is unique in terms of its structure and antioxidant function. The colloidal silver nanoparticles were observed to be highly stable, even after 5 months. XRD analysis showed that the silver nanoparticles are crystalline in nature with face-centered cubic geometry and the TEM micrographs showed spherical particles with an average size of 18 nm. Further, the antibacterial activity of silver nanoparticles was evaluated by well-diffusion method and it was observed that the biogenic silver nanoparticles have an effective antibacterial activity against Escherichia coli and Staphylococcus aureus. The outcome of this study could be useful for nanotechnologybased biomedical applications.

Research paper thumbnail of A biomimetic synthesis of stable gold nanoparticles derived from aqueous extract of Foeniculum vulgare seeds and evaluation of their catalytic activity

A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extrac... more A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extract of fennel (Foeniculum vulgare) seeds have been reported in this article. The seeds of F. vulgare are rich in various plant secondary metabolites (phytochemicals) such as polyphe-nolic acids, flavonoids, and saponins. The phytochemicals of F. vulgare seeds play dual role of reducing and stabilizing agents. The formation of gold nanoparticles was evidenced from the appearance of intense purple color at room temperature with k max around 550 nm in the UV–Vis absorption spectra. The stable AuNPs were further characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM) analysis. The synthesized nanoparticles were observed to be polydispersed, spherical and ranged from 10 to 30 nm with an average size of 20 ± 2 nm, as obtained from TEM images. The catalytic activity of gold nanoparticles was investigated by studying the reduction of anthropogenic dyes such as methylene blue (MB) and rhodamine B (Rh-B) with sodium borohydride. Results showed the possible applications of biogenic AuNPs in environment related problems.

Research paper thumbnail of Green biomimetic silver nanoparticles as invigorated colorimetric probe for Hg2+ ions: A cleaner approach towards recognition of heavy metal ions in aqueous media

Materials Chemistry and Physics, 2019

Research paper thumbnail of Evaluation of the kinetic and catalytic properties of biogenically synthesized silver nanoparticles

Journal of Cleaner Production, 2018

Present work encompasses the facile green and biogenic preparation of silver nanoparticles (AgNPs... more Present work encompasses the facile green and biogenic preparation of silver nanoparticles (AgNPs) using of cumin seeds (Cuminum cyminum) extract. The phytochemicals present in seeds extract, possessing strong anti-oxidant potential, reduce silver (Ag þ) ions and subsequently stabilize the newly formed silver (Ag 0) nuclei. The effect of pH, concentration of seeds extract, reaction time and stability of nanoparticles were investigated by UVevisible spectroscopy. The reddish-brown color at a wavelength of 422 nm corresponding to surface plasmon resonance (SPR) absorption, confirmed the formation of AgNPs. Further, the nucleation, growth and stabilization phases have been examined. The rate constant value suggests the rapid formation of stable AgNPs. The nanoparticles were further investigated by X-ray diffraction (XRD), high resolution transmission electron microscopy (HR-TEM) and Fourier transform infrared (FT-IR) spectroscopy. The biosynthesized AgNPs had been observed to be spherical in shape with an average particle size of 16 ± 2 nm as calculated from TEM images. Furthermore, the stable AgNPs were excellent nanocatalysts towards borohydride reduction of various anthropogenic dye pollutants viz. methylene blue (MB), methyl red (MR), rhodamine-B (Rh-B) and 4enitrophenol (4eNP).

Research paper thumbnail of Novel Green Biomimetic Approach for Preparation of Highly Stable Au-ZnO Heterojunctions with Enhanced Photocatalytic Activity

ACS Applied Nano Materials, 2018

A simple, ecofriendly, and biomimetic approach using cumin seeds extract (CSE) was developed for ... more A simple, ecofriendly, and biomimetic approach using cumin seeds extract (CSE) was developed for the formation of Au-ZnO Schottky contact without employing any chemical capping agents or stabilizers. The various unique phytoconstituents available in cumin seeds extract synergistically convert Au 3+ ions into Au 0 on the surface of ZnO, as each phytoconstituent is unique in context to its molecular structure and properties. The as-prepared biogenic Au-ZnO hybrid composites were examined using various spectroscopic and microscopic techniques. The TEM investigation and XRD patterns clearly depict the well dispersed AuNPs with the size range 10−15 nm and face centered cubic lattice on wurtzite ZnO nanostructures. The optical study of the nanocomposites showed two absorption bands: one intense band around 390 nm, which corresponds to ZnO, and a second broad band approximately around 540 nm, which corresponds to Au. The photocatalytic efficacy of Au-ZnO nanocatalysts was investigated by observing the mineralization of an aqueous solution of methylene blue (MB) dye under a 200 W tungsten filament lamp as visible light source. The apparent rate constants were also calculated for degradation processes, and it has been observed that 1 and 3 wt % Au-ZnO nanocomposites respectively have 2.27 and 3.2 times higher photoactivity, compared to pure ZnO. This enhanced photoactivity of biogenic Au-ZnO composite materials was resultant from formation of stable and effective Schottky contact between Au metal and ZnO surfaces.

Research paper thumbnail of Green biomimetic preparation of efficient Ag–ZnO heterojunctions with excellent photocatalytic performance under solar light irradiation: a novel biogenic-deposition-precipitation approach

Nanoscale Advances, 2019

A novel biogenic-deposition-precipitation (BDP) approach has been presented for the preparation o... more A novel biogenic-deposition-precipitation (BDP) approach has been presented for the preparation of stable binary composites using fennel seed extract.

Research paper thumbnail of A biomimetic synthesis of stable gold nanoparticles derived from aqueous extract of Foeniculum vulgare seeds and evaluation of their catalytic activity

Applied Nanoscience, 2017

A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extrac... more A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extract of fennel (Foeniculum vulgare) seeds have been reported in this article. The seeds of F. vulgare are rich in various plant secondary metabolites (phytochemicals) such as polyphenolic acids, flavonoids, and saponins. The phytochemicals of F. vulgare seeds play dual role of reducing and stabilizing agents. The formation of gold nanoparticles was evidenced from the appearance of intense purple color at room temperature with k max around 550 nm in the UV-Vis absorption spectra. The stable AuNPs were further characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM) analysis. The synthesized nanoparticles were observed to be polydispersed, spherical and ranged from 10 to 30 nm with an average size of 20 ± 2 nm, as obtained from TEM images. The catalytic activity of gold nanoparticles was investigated by studying the reduction of anthropogenic dyes such as methylene blue (MB) and rhodamine B (Rh-B) with sodium borohydride. Results showed the possible applications of biogenic AuNPs in environment related problems.

Research paper thumbnail of A facile biomimetic preparation of highly stabilized silver nanoparticles derived from seed extract of Vigna radiata and evaluation of their antibacterial activity

Applied Nanoscience, 2015

The significant antibacterial activity of silver nanoparticles draws the major attention toward t... more The significant antibacterial activity of silver nanoparticles draws the major attention toward the present nanobiotechnology. Also, the use of plant material for the synthesis of metal nanoparticles is considered as a green technology. In this context, a non-toxic, eco-friendly, and cost-effective method has been developed for the synthesis of silver nanoparticles using seed extract of mung beans (Vigna radiata). The synthesized nanoparticles have been characterized by UV-visible spectroscopy (UV-Vis), Fourier transform infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), atomic absorption spectroscopy (AAS), and X-ray diffraction (XRD). The UV-visible spectrum showed an absorption peak at around 440 nm. The different types of phytochemicals present in the seed extract synergistically reduce the Ag metal ions, as each phytochemical is unique in terms of its structure and antioxidant function. The colloidal silver nanoparticles were observed to be highly stable, even after 5 months. XRD analysis showed that the silver nanoparticles are crystalline in nature with face-centered cubic geometry and the TEM micrographs showed spherical particles with an average size of 18 nm. Further, the antibacterial activity of silver nanoparticles was evaluated by well-diffusion method and it was observed that the biogenic silver nanoparticles have an effective antibacterial activity against Escherichia coli and Staphylococcus aureus. The outcome of this study could be useful for nanotechnologybased biomedical applications.

Research paper thumbnail of A biomimetic synthesis of stable gold nanoparticles derived from aqueous extract of Foeniculum vulgare seeds and evaluation of their catalytic activity

A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extrac... more A facile biomimetic approach for the synthesis of gold nanoparticles (AuNPs) using aqueous extract of fennel (Foeniculum vulgare) seeds have been reported in this article. The seeds of F. vulgare are rich in various plant secondary metabolites (phytochemicals) such as polyphe-nolic acids, flavonoids, and saponins. The phytochemicals of F. vulgare seeds play dual role of reducing and stabilizing agents. The formation of gold nanoparticles was evidenced from the appearance of intense purple color at room temperature with k max around 550 nm in the UV–Vis absorption spectra. The stable AuNPs were further characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and transmission electron microscopy (TEM) analysis. The synthesized nanoparticles were observed to be polydispersed, spherical and ranged from 10 to 30 nm with an average size of 20 ± 2 nm, as obtained from TEM images. The catalytic activity of gold nanoparticles was investigated by studying the reduction of anthropogenic dyes such as methylene blue (MB) and rhodamine B (Rh-B) with sodium borohydride. Results showed the possible applications of biogenic AuNPs in environment related problems.