بررسی تأثیر استفاده از آهن و گرافن اکسید بر فعالیت فتوکاتالیستی تیتانیم‌دی‌اکسید به‌منظور تخریب ماده رنگزای متیلن آبی

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد، گروه مهندسی شیمی، دانشگاه صنعتی ارومیه، ارومیه، ایران

2 دانشیار، گروه مهندسی شیمی، دانشگاه صنعتی ارومیه، ارومیه، ایران

10.22093/wwj.2019.188383.2879

چکیده

تیتانیم‌دی‌اکسید از جمله فتوکاتالیست‌هایی است که به‌دلیل خواص منحصر به‌فرد، بیشترین کاربرد را در فرایندهای تصفیه پساب‌های صنعتی دارد. گاف انرژی بالا، بازترکیب الکترون-حفره و عدم قابلیت جداسازی پودر از فاضلاب تصفیه ‌شده از جمله موانع گسترش استفاده از TiO2 در مقیاس صنعتی است. در پژوهش حاضر از Fe3O4 و گرافن اکسید به‌منظور جداسازی و بهبود خواص فتوکاتالیستی TiO2 استفاده شد. مشخصه‌یابی نمونه‌ها با استفاده از پراش اشعه ایکس، طیف‌سنج فوریه مادون قرمز، میکروسکوپ الکترونی روبشی و دستگاه مغناطیس‌سنج انجام ‌شد و عملکرد فتوکاتالیستی کامپوزیت‌ها در حذف متیلن آبی تحت تابش نور مرئی توسط روش اسپکتروفتومتری UV-vis ارزیابی شد. نتایج حاصل نشان دهنده سنتز موفق نانوکامپوزیت TiO2/Fe3O4/GO با استفاده از روش دو مرحله‌ای سل ژل- هیدروترمال با خلوص بالا است. استفاده همزمان از GO و Fe3O4 فعالیت فتوکاتالیستی را به‌صورت قابل توجهی بهبود می‌بخشد به‌طوری که در مدت 80 دقیقه پرتودهی، امکان دستیابی به تخریب 90 درصد از ماده رنگزا امکان‌پذیر می‌شود. به‌دلیل خواص سوپرپارامغناطیسی محصول سنتز شده، نانوکامپوزیت پس از انجام عملیات تخریب به‌راحتی با استفاده از میدان مغناطیسی قابل جداسازی است.

کلیدواژه‌ها


عنوان مقاله [English]

Effects of Iron and Graphene Oxide on the Photocatalytic activity of Titanium Dioxide for Methylene Blue Degradation

نویسندگان [English]

  • Leila Zadmehr 1
  • Shiva Salem 2
1 MSc Student, Faculty of Chemical Engineering, Urmia University of Technology, Urmia, Iran
2 Assoc. Prof., Faculty of Chemical Engineering, Urmia University of Technology, Urmia, Iran
چکیده [English]

Among the photocatalysts, Titanium dioxide (TiO2) is mostly used for wastewater treatment. Nevertheless, large band gap, rapid recombination of electron–hole along with difficult separation process limits TiO2 applications in industrial scale. In this study, the photocatalytic activity and separation of TiO2 were improved by combined application of Fe3O4 and graphene oxide. X-ray powder diffraction (XRD), scanning electron microscopy (FESEM), and magnetization measurement (VSM) was utilized to characterize the sample and the photocatalytic degradation of methylene blue under visible light irradiation was evaluated by UV-vis spectrophotometer. The results indicate the successful preparation of purified TiO2/Fe3O4/GO nanocomposite by a two-step sol gel-hydrothermal method. The enhanced photocatalytic activity of nanocomposite is attributed to the simultaneous application of iron oxide and graphene oxide. The maximum photocatalytic decoloration (90%) is achieved within 80 min under lamp irradiation. The superparamagnetism of nanocomposites provided a convenient route for separation of the catalyst from the reaction mixture by an external magnet.

کلیدواژه‌ها [English]

  • photocatalyst
  • Titanium dioxide
  • graphene oxide
  • Fe3O4
  • Methylene blue
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