تهیه نانو ساختار فریت منیزیم تحت امواج فراصوت و بررسی فعالیت فوتوکاتالیستی آن برای حذف متیلن بلو از آب

نوع مقاله: مقاله پژوهشی کامل

نویسندگان

1 گروه فیزیک، دانشکده علوم، دانشگاه محقق اردبیلی، اردبیل، ایران

2 دانشگاه محقق اردبیلی

3 گروه شیمی، دانشکده علوم، دانشگاه محقق اردبیلی، اردبیل، ایران

4 گروه علوم مهندسی، دانشکده فناوری‌های نوین سبلان، دانشگاه محقق اردبیلی، نمین، ایران

10.22055/jrmbs.2019.14591

چکیده

در این پژوهش، نانوساختار فریت منیزیم به روش فراصوت تهیه شده و برای مطالعه‌ی ویژگی‌های ساختاری، اپتیکی و مغناطیسی آن‌ از داده‌های حاصل از پراش پرتو ایکس (XRD)، میکروسکوپی الکترونی روبشی (SEM)، طیف سنجی مرئی-فرابنفش
(UV-Vis) و مغناطیس سنج ارتعاشی (VSM) استفاده شده است. الگوی XRD نشان داد که نانوساختارفریت منیزیم با فاز مکعبی اسپینلی سنتز شده است. تصاویر SEM نشان می‌دهند که شکل نانوساختار به صورت تقریباً کروی بوده و اندازه میانگین نانوساختارها در حدود 15-10 نانومتر بوده‌اند. مقدار گاف انرژی نانوساختارهای فریت منیزیم تهیه شده، از طریق طیف جذبی UV-Vis، برابر eV 8/2 بدست آمده است که در مقایسه با حالت توده‌ای آن به مقدار eV62/0جابجایی به سمت ناحیه آبی دارد که به دلیل اثر محدود شدگی کوانتمی و حبس الکترون‌ها در فضای کوچک‌تر است. حلقه پسماند به‌دست آمده از آنالیز VSM برای نمونه نشان می‌دهد که نانوساختار فریت منیزیم در دمای اتاق از خود رفتار پارامغناطیسی نشان می‌دهد.
مقدار بهینه pH برای متیلن آبی برابر13 بود. شدت و طیف منبع نوری مهندسی شده و موثرترین حالت برای این آزمایش بکار گرفته شده است. نتایج نشان دادند که در مدت زمان 45 دقیقه 99% رنگ توسط نانوساختار فریت منزیم تخریب می‌شود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Preparation of nanostructures magnesium ferrite by ultrasound-assisted method and investigation Its photocatalytic activity to remove methylene blue from water

نویسندگان [English]

  • Elaheh Taami 1
  • Yashar Azizian-Klandaragh 2
  • Ali Khodayari 3
  • Gholamreza Pirgholi Givi 4
1 Department of Physics, Faculty of Science, Mohaghegh Ardabili University, Ardabil, Iran
2 Department of Physics, Faculty of Science, Mohaghegh Ardabili University, Ardabil, Iran
3 Department of Chemistry, Faculty of Science, Mohaghegh Ardabili University, Ardabil, Ira
4 Deprtment of Engineering Sciences, Sabalan University of Advanced Technologies (SUAT), Namin, Iran
چکیده [English]

In this research, magnesium ferrite nanostructures have been prepared by the ultrasound-assisted method and for their structural, optical and magnetic characteristics, different methods such as X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-Visible spectroscopy and vibrating sampling magnetometer (VSM), have been used. XRD pattern of the prepared magnesium ferrite nanostructures shows mixed cubic spinel phase. SEM images show a nearly spherical form of nanostructures and the mean nanoparticles size are about 10-15nm. Bandgap value of the prepared magnesium ferrite derived from UV-visible absorption spectra is 2.8eVwhich in comparison with its bulk value, a blue shift (0.62eV) due to the quantum confinement effect observed. The hysteresis loop of the prepared sample from the VSM analysis for the prepared magnesium ferrite nanostructures at room temperature shows a paramagnetic behavior.
The optimum value of the pH of MB was 13. The intensity and spectrum of light source were engineered and the most efficient state has been used for the experiment. the results showed that within 45 minutes 99% of dye is degraded by magnesium ferrite nanostructures.

کلیدواژه‌ها [English]

  • "magnesium ferrite nanostructure"
  • "ultrasound"
  • "photocatalytic activity"
  • "methylene blue"

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