Browsing by Author "Deen Dayal Upadhyay"

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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.