مواد پیشرفته در مهندسی

مواد پیشرفته در مهندسی

تولید نانوذرات اکسید روی جاذب اشعه ماورای بنفش به روش سنتز سبز به کمک عصاره چای سبز

نوع مقاله : مقاله پژوهشی

نویسندگان
1 بخش مهندسی مواد و متالورژی، دانشگاه شهید باهنر کرمان، کرمان، ایران
2 پژوهشکده سرامیک، پژوهشگاه مواد و انرژی، کرج، ایران
چکیده
مقدمه و اهداف: در این پژوهش، نانوذرات اکسید روی جاذب اشعه ماورای بنفش با استفاده از عصاره چای سبز به‌عنوان عامل کاهنده و پایدارکننده سنتز شدند.
مواد و روش‌ها: عصاره چای سبز که با دم‌کردن 10 گرم چای سبز داخل 100 میلی‌لیتر آب مقطر در دمای 60˚C تا 80˚C به‌دست‌آمده بود، به‌صورت قطره‌ای به محلول استات روی اضافه گردید و سپس محلول رقیق‌شده اگزالیک اسید به‌صورت قطره‌ای به آن اضافه شده و روی همزن در دمای 75˚C به‌مدت دو ساعت قرار گرفت تا رسوب‌گذاری در pH هفت انجام شود. پودر حاصل داخل خشک‌کن به‌مدت 12 ساعت خشک شد و داخل کوره در دمای 400˚C عملیات حرارتی شد.
یافته‌ها: آنالیزهای پراش پرتو ایکس و میکروسکوپ الکترونی روبشی نشان دادند که نانوذرات سنتزشده دارای ساختار متخلخل با اندازه متوسط بلورک حدود 24 نانومتر هستند. طیف‌سنجی مادون‌قرمز حضور گروه‌های فعال سطحی O–H و C–H و C=O و C–O را تأیید کرد. کلسینه‌کردن پودر حاصل در دمای 450˚C، منجر به افزایش شدت باند Zn–O و بهبود میزان بلورینگی و ارتقاء جذب اشعه فرابنفش گردید. طیف‌سنجی محدوده طیف مرئی و ماورای بنفش این نمونه، پیک جذبی در طول‌موج 370 نانومتر را آشکار ساخت و آنالیز طیف‌سنجی پراش انرژی پرتو ایکس خلوص بالای محصول نهایی را تأیید کرد.
نتیجه‌گیری: این مطالعه نشان می‌دهد که عصاره چای سبز، می‌تواند به‌عنوان یک عامل طبیعی و زیست‌سازگار در سنتز نانوذرات اکسید روی با ویژگی‌های مطلوب مورفولوژی و قابلیت جذب اشعه ماورای بنفش استفاده شود.
کلیدواژه‌ها
موضوعات

عنوان مقاله English

Production of UV-Absorbing Zinc Oxide Nanoparticles by Green Synthesis Using Green Tea Extract

نویسندگان English

Zahra Zarei 1
Kazem Tahmasebi 2
1 Department of Materials and Metallurgical Engineering, Shahid Bahonar University of Kerman, Kerman, Iran
2 Ceramics Department, Materials and Energy Research Center, Karaj, Iran
چکیده English

Introduction and Objectives: Zinc oxide nanoparticles were synthesized as ultraviolet absorbers using green tea extract as a reducing and stabilizing agent.
Materials and Methods: Green tea extract, which was obtained by brewing 10 g of green tea in 100 ml of distilled water at a temperature of 60 to 80 °C, was added dropwise to a zinc acetate solution, and then a diluted oxalic acid solution was added dropwise to it. The mixture was stirred at 75 °C for 2 hours to precipitate at pH 7. The resulting powder was dried in an oven for 12 hours and heat-treated in an electrical furnace at 450 °C.
Results: X-ray diffraction and scanning electron microscope analyses showed that the synthesized nanoparticles have a porous structure with an average crystallite size of about 24 nm. Fourier Transform Infrared spectroscopy confirmed the presence of O–H, C–H, C=O and C–O surface active groups. Calcination of the resulting powder at 450°C resulted in an increase in the intensity of the Zn–O bond, improved crystallinity and enhanced ultraviolet absorption. Ultraviolet–visible spectroscopy of this sample revealed an absorption peak at 370 nm, and Energy Dispersive spectroscopy analysis confirmed the high purity of the final product.
Conclusion: This study declares that green tea extract can be used as a natural and biocompatible agent in the synthesis of zinc oxide nanoparticles with desirable morphological and optical properties. The produced nanoparticles absorb ultraviolet radiation efficiently.

کلیدواژه‌ها English

Nanoparticles
Zinc oxide
Green synthesis
Green tea extract
Natural sunscreen
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