|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|29474||1418074||2016||6 صفحه PDF||سفارش دهید||دانلود کنید|
• Hematite nanoparticles of 15–40 nm diameter was biosynthesized rapidly in 48 h.
• Rapid biosynthesis can be primed with 1 mM ferric chloride at pH 9 and 37°C temperature.
• Hematite nanoparticles are crystalline hexagonal structured and are predominantly (110)-oriented.
Hematite (α-Fe2O3) nanoparticles are widely used in various applications including gas sensors, pigments owing to its low cost, environmental friendliness, non-toxicity and high resistance to corrosion. These nanoparticles were generally synthesized by different chemical methods. In the present study, nanoparticles were synthesized rapidly without heat treatment by biosynthesis approach using culture supernatant of Bacillus cereus SVK1. The physiochemical parameters for rapid synthesis were optimized by using UV–visible spectroscopy. The time taken for hematite nanoparticle synthesis was found to increase with the increasing concentration of the precursor. This might be due to the inadequate proportion of quantity of biomolecules present in the culture supernatant to the precursor which led to delayed bioreduction. Greater quantities of culture supernatant with respect to precursor lead to rapid synthesis of hematite nanoparticles. The nucleation of the hematite nucleus happens more easily when the solution pH was less than 10. The optimum parameters identified for the rapid biosynthesis of hematite nanoparticles were pH 9, 37 °C (temperature) and 1 mM ferric chloride as precursor. The particles were well crystallized hexagonal structured hematite nanoparticles and are predominantly (110)-oriented. The synthesized nanoparticles were found to contain predominantly iron (73.47%) and oxygen (22.58%) as evidenced by Energy Dispersive X-ray analysis. Hematite nanoparticles of 15–40 nm diameters were biosynthesized in 48 h under optimized conditions, compared to 21 days before optimization.
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Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 159, June 2016, Pages 82–87