Browsing by Author "Gajanan Pandey"

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Biogenically produced Co3O4 nanoparticles and their application as micronutrient and antimicrobial agent for agro-environmental sustainability
(Elsevier B.V., 2023) Deen Dayal Upadhyay; Swati Singh; Kijay Bahadur Singh; Neelam Gautam; Sanjay Shrivastava; Gajanan Pandey
Present study reports an eco and environmental friendly biogenic synthetic protocol for generation of Co3O4 nanoparticles (NPs) using aqueous extract of leaves of Ipomoea carnea plant, which act as both reducing and capping agents. Thus produced Co3O4 material has been characterized by various techniques like UV–visible absorption spectrum, Fourier transform infrared spectroscopy (FTIR), powder X-ray diffraction (XRD), Scanning electron microscope (SEM) with Energy-dispersive X-ray (EDX),Transmission electron microscope (TEM), (X-Ray Photoelectron Spectroscopy (XPS), Brunauer-Emmett-Teller (BET), particles size distribution analyses. The results revealed formation of well crystalline, mesoporous very small size (6–10 nm diameter), having very narrow size distribution nanoparticles. Phytotoxicity, antifungal and antibacterial activities, lipid test and protein test have been performed using Co3O4 NPs. Phytotoxicity results showed the 14.75 ± 0.57 and 9.11 ± 0.86, 7.65 ± 2.110 and 10.6 ± 1.813, and 6.35 ± 3.361 and 12.8 ± 1.720 roots and shoots length of respectively Vignaradiata, Pisumsativum and Cicerarietinum obseved using 20 ppm Co3O4 NPs. Antifungal activity was done against A. flavus CR500 while antibacterial activity was performed on Staphylococcus aureus and Shigella flexnerii using MHA media and inhibition zone was recorded till 17.8 mm and 16.7 mm respectively. 96% yield in catalytic oxidation of benzaldehyde into benzoic acid was found using Co3O4 NPs as catalyst. © 2023 Elsevier B.V.
Biosynthesis of ZnO and TiO2 nanoparticles using Ipomoea carnea leaf extract and its effect on black carrot (Daucus carota L.) cv. Pusa Asita
(Elsevier Masson s.r.l., 2023) Deen Dayal Upadhyay; Ankit Kumar Goyal; Sutanu Maji; Arpita Dwivedi; Gajanan Pandey
Nano fertilizers (NFs) are now becoming an important tool for plant nutrient management having capabilities to improve soil fertility, crop productivity and quality of agricultural products. Since, they are needed in very small amount, thus, reduces cost of crop production. Among different essential or beneficial plant nutrients, Zn and Ti are important micro nutrients having number of beneficial effect on crop growth, yield, quality and post harvest life. Present experiment was carried out to prepare ZnO and TiO2 nanoparticles (NPs) through green technology by using aqueous extract of Ipomoea carnea (morning glory) leaves. In order to investigate size, morphology, composition, and stability of selected NPs, the detailed characterization was carried out using UV–visible spectroscopy, FTIR, HRTEM, EDX, BET, X-ray diffraction, XPS and particle size distribution studies. Subsequently, the effect of foliar spray of ZnO and TiO2 NPs was evaluated in respect of vegetative growth, yield and quality of black carrot (Daucus carota L.) cv. Pusa Asita in presence of 50% Recommended dose of fertilizer (RDF) to assess their effect on fertilizer use efficiency also. There were 8 treatments viz. Control (no fertilizer), recommended dose of fertilizer (RDF), TiO2 (5, 10 and 15 ppm along with 50% RDF), ZnO (50, 75 and 100 ppm along with 50% RDF)] with 3 replications following Randomised Block Design having 24 plots (1 m × 1 m). The observations were taken for vegetative growth, edible root yield and root quality parameters. Although, the growth, yield and quality parameters were found superior (root yield 43.84 g/plant) under conventional system of recommended dose of fertilizers (RDF) of NPK, however, TiO2 NPs also showed very promising result close to RDF as compared to ZnO NPs. Among them, 5 ppm TiO2 foliar application along with 50% NPK was found to be the best in terms of vegetative growth, root yield (38.73 g/plant) and quality of black carrot. It was also found that higher concentration of TiO2 and ZnO NPs had adverse effect on the plant performance. Therefore, it can be concluded that 5 ppm TiO2 NPs along with 50% RDF was good for black carrot production. © 2023 Elsevier Masson SAS
Fabrication of Curcuma longa mediated novel Ni@ZnO/MoO3 composite anchored with g-C3N4 for sunlight driven photocatalytic activity
(Elsevier B.V., 2023) Neelam Gautam; Kijay Bahadur Singh; Deen Dayal Upadhyay; Sanjay Srivastava; Gajanan Pandey
The extreme toxicity, genotoxicity, and carcinogenicity of Azure B in the aquatic environment have drawn attention to grow solar-driven techniques using effective photocatalysts for environment friendly remediation. We created Ni@ZnO/MoO3 z-scheme type structures supported on g-C3N4 photocatalyst by the sonochemically assisted biochemical method using Curcuma longa leaf extract. Structural, morphological, and surface features were investigated using X-ray diffraction (XRD), FTIR, UV–Visible, SEM/EDX, HR-TEM, XPS, and BET for surface analysis. Results indicated that MoO3 nanoplates and Ni@ZnO nanorods are beautifully oriented and interconnected, and these two crystalline materials are wrapped with a stacked layer of g-C3N4 which developed the proper charge flow resulting in the enhanced photo-assisted catalytic performance of the composite. Ternary composite has a large surface area as well as pore volume which automatically increased active site on the surface which enhanced photoactivity. In comparison to the g-C3N4 and Ni@ZnO/MoO3 composite, the Ni@ZnO/MoO3/g-C3N4 ternary nanocomposite displayed superior photocatalytic efficiency for the degradation of Azure B (AzB). Recyclability study showed its prolonged reusability. At optimized conditions, the photodegradation of AzB by ternary composite exhibited pseudo-first-order kinetics with the rate constant value of 0.074 min−1. It is found that h+ and •-O2are the active species for the photodegradation of AzB. © 2023 Elsevier B.V.
In-situ One-Pot Novel Synthesis of Molybdenum di-Telluride@Carbon Nano-Dots for Sensitive and Selective Detection of Hydrogen Peroxide Molecules via Turn-off Fluorescence Mechanism
(Elsevier Inc., 2022) Pinky Sagar; Monika Srivastava; Rajan Kumar Tiwari; Ajay Kumar; Amit Srivastava; Gajanan Pandey; S.K. Srivastava
Transition metal dichalcogenides (TMDs) based materials have grabbed striking attention to a great extent owing to their intriguing characteristics for biological, optical, chemical and medicinal applications. Herein, we report in-situ one-pot hydrothermal-synthesis of molybdenum ditelluride@carbon nano-dots (MoTe2@C NDs) and then explored its potency in biosensing. The MoTe2@C NDs have been characterized by using X-ray Photoelectron Spectroscopy (XPS), Raman spectroscopy and Transmission Electron Microscopy (TEM) for confirmation. Furthermore, the photophysical properties of MoTe2@C NDs have been examined. Under radiation of Ultra-Violet (UV) light (λ = 365 nm), the MoTe2@C NDs emit cyan fluorescence which has been confirmed by photoluminescence (PL) spectroscopy (PL peak at ∼431 nm, excitation wavelength ∼350 nm). The as-synthesized sample has been subjugated for the sensing of hydrogen-peroxide (H2O2) molecules. Notably, with a gradual proliferation of the concentration of H2O2, the PL intensity of the MoTe2@C NDs decreases and is found to be linear (R2 = 0.9986). The detection-limit has also been estimated as 14.22 nM. The PL quenching-mechanism has been elucidated based on three-level kinetic model considering charge separated-trap states (1[D+···A−] ↔ 3[D+···A−]). This is the first work of hydrothermal-synthesis of MoTe2@C NDs and study of its optical properties, which has efficient potential to use as H2O2 sensor in industrial/biomedical applications. © 2022 Elsevier B.V.
The study of the green synthesis of Co3O4 nanomaterials and Co3O4/Ce24Co11/CeO2 nanocomposites using Kigelia pinnata fruit extract and their antibacterial potential
(Elsevier B.V., 2025) Anil Kumar Gautam; Ruchi Shankhwar; Snigdha; Ravi Kr Gupta; Sanjay Kumar Srivastava; Gajanan Pandey
In this study the aqueous extract of Kigelia pinnata fruit was used to produce three different nanomaterials; Co3O4 (termed as KpCoO) NPs, Co3O4/Ce24Co11/CeO2 (5 mol % Ce and 95 mol % Co, termed as KpCe@CoO-5) and Co3O4/Ce24Co11/CeO2 (10 mol % Ce and 90 mol % Co, termed as KpCe@CoO-10) nanocomposites. A comparative examination of their antibacterial effectiveness against the harmful bacterial strains S. aureus and P. aeruginosa was conducted using KpCoO NPs and KpCe@CoO-5, KpCe@CoO-10 NCs. Optical and structural properties of the nanomaterials were determined using UV–visible, FTIR, XRD, SEM, EDX, HRTEM, BET and XPS spectroscopy. Crystallography Open Database (COD) and Match software were used to verify the presence of Co3O4 and cerium mixed Co3O4/Ce24Co11/CeO2 nanocomposites with the cubic, trigonal and cubic respectively. The fruit extract's phytochemicals played an important role in the formation as well as stabilization of nanomaterials with capping on the surface of the nanomaterials. The size of the nanomaterials and antibacterial activity are decreased by mixing the cerium salt mole% in copper salts. Overall, the used low-cost and environmentally benign green synthesized novel nanomaterials exhibited antibacterial activity of KpCoO in comparison to its nanocomposites (KpCe@CoO-5 and KpCe@CoO-10) with the Cerium metals. © 2024 Elsevier B.V.
γ-MnS nano and micro architectures: Synthesis, characterization and optical properties
(2011) Gajanan Pandey; Harendra K. Sharma; S.K. Srivastava; R.K. Kotnala
γ-MnS nanocrystalline materials have been prepared by reaction of Na2[Mn(HL)2(H2O)2]; 1:2 (M:L) chelate complex with alkaline solution of thiocarbamide in aqueous solution phase. Effect of metal chelate complex, reaction time and surfactant sodium dodecyl sulfate; SDS on phase, morphology and size of the products have been investigated. The metal chelate complex was synthesized by reacting Mn(II) ions with eriochrome black T (NaH2L) in alkaline medium. γ-MnS crystals were formed when metal complex was used as metal source whereas Mn 3O4 was the dominant product when MnSO4· H2O was used as metal source. Materials thus formed having various morphologies were characterized by X-ray diffraction, scanning electron microscopy (SEM), transmission electron microscopy (TEM) to determine the crystallinity, phase, structure and morphology. The optical properties of the thus prepared samples were determined by UV-vis absorption spectra and photoluminescence spectra. A possible formation mechanism of crystals has been discussed in this article. © 2011 Elsevier Ltd. All rights reserved.