Harshal Dabhane; Suresh Kushinath Ghotekar; Pawanwan Jagannath Tambade; Shreyas Pansambal; H C Ananda Murthy; Rajeshwari Oza; Vijay Medhane
Abstract
Nowadays, green syntheses have received crucial attention as a reliable, developing and eco-benevolent protocol for synthesizing a broad range of nanomaterials (NMs) including metal/metal oxides NMs, bio-inspired materials and hybrid/composite NMs. As such, biogenic synthesis is regarded as a significant ...
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Nowadays, green syntheses have received crucial attention as a reliable, developing and eco-benevolent protocol for synthesizing a broad range of nanomaterials (NMs) including metal/metal oxides NMs, bio-inspired materials and hybrid/composite NMs. As such, biogenic synthesis is regarded as a significant tool to mitigate the destructive impacts associated with the conventional approaches of synthesis for NMs generally utilized in industry and laboratory. In this review, we summed up the general protocols and mechanisms of green synthesis routes, especially for silver (Ag), silver oxide (Ag2O), cadmium (Cd), copper (Cu), copper ferrite (CuFe2O4), palladium (Pd), aceprophyline, cellulose and graphene nanomaterials/nanoparticles using cow urine. Importantly, we explored the main role of biological constituents which is existed in cow urine. These essential biomolecules act as reducing/stabilizing agents in solvent systems. The stability, phase formation and surface morphology of NMs using characterization techniques are also discussed. Finally, we covered the eclectic applications of such synthesized NMs in terms of anti-asthma, antimicrobial, antituberculosis, antioxidant, anticancer activity, catalytic activity and removal of pollutants dyes.
Susarla Sastry
Abstract
Nanotechnology is getting an incredible drive due to the potential of manipulating metals into their nano size particles. The synthesis and characterization of nano particles using green technology have many applications. The wet chemical techniques used presently in the synthesis of nano particles are ...
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Nanotechnology is getting an incredible drive due to the potential of manipulating metals into their nano size particles. The synthesis and characterization of nano particles using green technology have many applications. The wet chemical techniques used presently in the synthesis of nano particles are deleterious along with flammable conditions. Silver nanoparticles have the capability of killing microbes in an effective manner. This paper explains about the green technology and pollution free methodology for synthesizing silver particles at nano scale using 1mM silver nitrate solution from the extracts of Carica papaya, Emblica officianalis, Azadirachta indica and Cocos nucifera. When the silver nanoparticles are synthesized the solution turns to brownish yellow colour. The tools used in the characterisation of silver nano particles are Ultra Violet - Visible absorption Spectroscopy and Field Emission Scanning Electron Microscopy. The solutions with silver nanoparticles showed the maximum absorption at 450 nm with Ultra Violet - Visible spectroscopy. It is found that C. Papaya and E. oficianalis showed the maximum absorbance of 0.578 and 0.59 respectively at 450 nm. The average range of the produced silver nano particles are analysed to be 5 – 70 nm with FESEM and the shape is examined to be spherical.
Suresh Ghotekar; Ajay Savale; Shreyas Pansambal
Abstract
The aim of this study was to expand an ecofriendly route for the fabrication of spherical shape silver nanoparticles (AgNPs) using an aqueous extract of Leucaena leucocephala L. leaves to act as stabilizing and reducing agent. Several biomolecules present in plant extract are accountable for single step ...
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The aim of this study was to expand an ecofriendly route for the fabrication of spherical shape silver nanoparticles (AgNPs) using an aqueous extract of Leucaena leucocephala L. leaves to act as stabilizing and reducing agent. Several biomolecules present in plant extract are accountable for single step reduction of metal ions into nanoparticles. The synthesized AgNPs were characterized by X-ray diffraction (XRD) profile, Fourier transform infrared (FTIR) spectroscopy, field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDS) and Photoluminescence. Besides these, AgNPs evinced potent antibacterial, antimalarial and antimycobacterial activity against Pseudomonas aeruginosa, Streptococcus pyogenes, Staphylococcus aureus, Escherichia coli, Salmonella typhi, Bacillus subtilis, Plasmodium falciparum and Mycobacterium tuberculosis. The results suggest that the efficiently synthesized AgNPs can be used as potential candidates for various medicinal applications in bionanotechnology based industries.
Mustafa Nadhim Owaid; Sajid Salahuddin Saleem Al-Saeedi; Idham Ali Abed
Abstract
Twelve extracts belong to four species of edible oyster mushrooms were screened for their chemical value (viz. proteins, carbohydrates and phenols were assessed) and their capability to biosynthesize silver nanoparticles (AgNPs). In limitative conditions, dark incubation and temperature 25 °C, three ...
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Twelve extracts belong to four species of edible oyster mushrooms were screened for their chemical value (viz. proteins, carbohydrates and phenols were assessed) and their capability to biosynthesize silver nanoparticles (AgNPs). In limitative conditions, dark incubation and temperature 25 °C, three modes of extracts preparation were developed. Properties of silver nanoparticles creation from extracts solution with 1 mM AgNO3 were investigated by color and UV-Visible spectroscopy to confirm silver nanoparticles formation. The bright yellow oyster mushroom (Pleurotus cornucopiae var. citrinopileatus) was finding as a potential candidate for the synthesis of AgNPs. Brown color of aqueous solution was given indication for AgNPs formation. Results showed that AgNPs absorption band was located at a peak of 440 nm for P. cornucopiae var. citrinopileatus. Although others P. ostreatus (grey & white) and P. salmoneostramineus (pink) were not form AgNPs due to no change in color of extracts with Ag ions when incubated under the same conditions, which indicative for no silver nanoparticles synthesis. Thus, AgNPs formation depended on species of oyster mushroom, method of extracting, concentration of extract and the conditions of incubation (of light and temp.), but no on content of proteins, carbohydrates and phenol in crude extract leastwise in this study
Susan Samadi; Rokhsareh Motallebi; Maryam Nasiri Nasrabadi
Abstract
The efficient application of the photocatalytic activity and superficial adsorption on removing heavy metals from water, two types of sorbents, Nd-TiO2/bentonite and Ce-TiO2/bentonite nanocomposites, were synthesized by sol-gel method. The crystalline nanocomposites were obtained after heat treatment ...
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The efficient application of the photocatalytic activity and superficial adsorption on removing heavy metals from water, two types of sorbents, Nd-TiO2/bentonite and Ce-TiO2/bentonite nanocomposites, were synthesized by sol-gel method. The crystalline nanocomposites were obtained after heat treatment at 500 °C for 3 hours. The results of scanning electron microscopy (SEM) indicates that Nd-TiO2/bentonite and Ce-TiO2/bentonite were produced on a nanoscale. The phase change of both nanocomposite from amorphous to anatase has been investigated by X- ray diffraction. Removal of lead (II) and cadmium (II) were studied through adsorption on these nanocomposites by letting them float in the bulk of sample for a definite time in presence and absence of light. The effective parameters in removal process were studied and optimized. The optimum pH, removal time and sorbent dosage in the absence and presence of light for Pb2+ ion were 7, 0.3 g, 15 min and for Cd2+ ion were 7, 0.4 g, 20 min, respectively. Subsequently, the effect of interfering ions in removal process was investigated at optimum conditions and no evidence of interference was observed. The study showed that reproducibility of method (n=9) is good and suitable. The results further indicated that the removal efficiency of Pb2+ ion with Nd-TiO2/bentonite in the presence of light was more than that in the absence of light. Finally, the equilibrium adsorption data fitted Freundlich and Langmuir adsorption models.