Rajani Bharati; S. Suresh
Abstract
The aim of this research work is Synthesis of ZnO/SiO2 with Palash leaves extract nanocatalyst by green synthesis route. Palash leaves extract contain a broad variability of bio-molecules which act as capping and reducing agents and increases the rate of reduction and stabilization of nanoparticles. ...
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The aim of this research work is Synthesis of ZnO/SiO2 with Palash leaves extract nanocatalyst by green synthesis route. Palash leaves extract contain a broad variability of bio-molecules which act as capping and reducing agents and increases the rate of reduction and stabilization of nanoparticles. Nanocatalyst synthesized by this method are eco-friendly and cheap. No work has been found on Butea monosperma (Palash) leaves extract with ZnO nanoparticles. This research work synthesis of ZnO/SiO2 with palash leaves extracts nanocatalysts has been made by using green synthesis route. This synthesized nanocatalyst was used for removal of COD (mg/l) and polycyclic aromatic hydrocarbons as pollutants from petrochemical industrial wastewater. The synthesized nanocatalyst of ZnO/SiO2 with palash leaves extract was characterized using BET surface area, FEG-SEM, EDAX, XRD, and FTIR. Results show that we have synthesized ZnO/SiO2 nanocatalyst with BET surface area 160.23 m2/g and SEM micrograph shows the spot of nano range particles. From SEM test it has been found that we synthesized ZnO/SiO2 nanoparticles in the range of 3 to 35 nm and average particle diameter is 15.8nm. XRD and EDAX result show that we have found nanoparticles of SiO2 and ZnO. FTIR results show that Zn-O, Si-O-Si stretching have been found at 1004.95, 861.24 cm-1 for ZnO and 1270.17 cm-1 for SiO2 respectively. Results shows that optimum percent removal of COD (mg/l) and acenaphthene (polycyclic aromatic hydrocarbon) as pollutant are 70 % and 79% respectably at 0.5g/500ml catalyst loading, at 30oC temperature for 4h reaction time. In Future this catalyst can be used to remove other PAH and phenolic compounds from petrochemical wastewater under visible light also and other industrial wastewater can also treat by this catalyst effectively. Copyright © 2018 VBRI Press.
Abhishek K. Bhardwaj; Abhishek Shukla; S. C. Singh; Kailash N. Uttam; Gopal Nath; Ram Gopal
Abstract
Green synthesis of nanoparticles (NPs) from biological constituents extracts have emerged as potential methods for the fabrication of metallic NPs. In the present study, Cuprous oxides hallow microspheres (Cu2O-HMs) have been synthesized using D. carota pulp waste extract (CPWE). This Cu2O hollow microsphere ...
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Green synthesis of nanoparticles (NPs) from biological constituents extracts have emerged as potential methods for the fabrication of metallic NPs. In the present study, Cuprous oxides hallow microspheres (Cu2O-HMs) have been synthesized using D. carota pulp waste extract (CPWE). This Cu2O hollow microsphere (Cu2O-HMs) synthesis is environmental friendly, at room temperature. The aqueous copper ions are reduced into Cu2O-NPs, when these ions interact with active reducing constituents of CPWE and very little amount of sodium hydroxide for enhancing rate of reaction. The Cu2O-NPs have been characterized by UV-Vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and Transmission electron microscopy (TEM). XRD measurements contain average size of Cu2O-NPs are approx 12 nm which is responsible to form Cu2O-HMs. UV-VIS spectra show that the surface Plasmon resonance peak of copper is observed at 490 nm. FTIR measurements indicate the presence of different reducing constituents in D. carota extract which is responsible for reducing and capping bioreduced Cu2O-HMs. TEM measurement shows that most Cu2O-HMs are spherical in shape and are responsible to form microsphere and nanotubes. Antibacterial activity of Cu2O-HMs tested on S. aureus shows a comparable zone of inhibition. These interesting results may be applicable for the cost-effective, environmental friendly, surface disinfectant and biomedical fields. Copyright © 2017 VBRI Press.
Aftab H. Mondal; Mohammad T. Siddiqui; Kehkashan Siddiqui; Qazi M. Rizwanul Haque
Abstract
In the present work, biosynthesis of silver nanoparticles (AgNPs) using isolate of Shigella sp. AS8 culture supernatant as a reducing agent has been demonstrated. Synthesis of AgNPs was completed within 180 min of incubation at 35 °C under bright light condition. The biosynthesized nanoparticles ...
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In the present work, biosynthesis of silver nanoparticles (AgNPs) using isolate of Shigella sp. AS8 culture supernatant as a reducing agent has been demonstrated. Synthesis of AgNPs was completed within 180 min of incubation at 35 °C under bright light condition. The biosynthesized nanoparticles were characterized by UV-vis spectroscopy, Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Dynamic light scattering (DLS), Transmission electron microscopy (TEM), Field emission scanning electron microscopy (FE-SEM) equipped with energy dispersive X-ray (EDX) and Atomic force microscopy (AFM). The formation of brown color reaction product with strong UV-vis spectrum absorption maxima at 411 nm due to surface plasmon resonance (SPR) indicated the synthesis of AgNPs. FTIR spectrum confirmed association of supernatant protein molecules with synthesized nanoparticles. DLS, TEM, FE-SEM and AFM showed biosynthesized nanoparticles were spherical in shape with an average size of 20 nm. EDX data analysis reveals presence of metallic silver. While, XRD analysis revealed that synthesized particles were pure and crystalline in nature. Further, AgNPs were evaluated as an antibacterial agent against extended spectrum β-lactamase (ESBL) positive water-borne pathogens. The results of present study suggest that biosynthesized AgNPs can be used to combat ESBL producing multidrug resistant bacteria.
