تجزیه فتوکاتالیستی آلاینده نرمال هگزان در فاز گاز با استفاده از نانو ذرات TiO2 بهبود یافته با داپ نیتروژن

نوع مقاله: مقاله پژوهشی

نویسندگان

مرکز تحقیقات کاتالیست، گروه مهندسی شیمی، دانشکده فنی، دانشگاه رازی، کرمانشاه، ایران

10.22078/pr.2018.3189.2469

چکیده

در این پژوهش گزارشی از اکسیداسیون فتوکاتالیستی نرمال‌هگزان در فاز گاز و تبدیل آن به کربن‌دی‌اکسید و آب با استفاده از فتوکاتالیست TiO2 بهبود یافته با داپ نیتروژن ارائه شده است. خواص فتوکاتالیست و ریخت‎شناسی آن با استفاده از آنالیز‌های XRDا، FTIRا، SEM و XRF مورد بررسی قرار گرفت و محصولات اکسیداسیون فتوکاتالیستی با استفاده از دستگاه گازکروماتوگراف وآنالیز FTIR شناسایی شدند. نتایج آنالیز SEM تغییرات چندانی از سطح کاتالیست در اثر داپ کردن نیتروژن را نشان نمی‌داد و همچنین نتایج عملکرد فتوکاتالستی نشان داد که فتوکاتالیست TiO2 بهبود یافته با داپ نیتروژن در نور مرئی قادر است نرمال‌هگزان خوراک در غلظت‌های مختلف را به کربن‌دی‌اکسید و آب تبدیل کند. تبدیل فتوکاتالیستی نرمال‌هگزان در نور مرئی با استفاده از فتوکاتالیست TiO2 بهبود یافته با داپ نیتروژن در مقایسه با تبدیل فتوکاتالیستی آن با استفاده از فتوکاتالیست خالص TiO2 در نور فرابنفش عملکرد بهتری داشت. واسطه‌هایی مانند الکل، آلدهید، کتون و کربکسیلیک اسید در محصولات توسط آنالیز FTIR شناسایی شدند که مکانیزمی بر پایه این آنالیز برای تولید این واسطه‌ها و محصول نهایی نیز پیشنهاد شده است.
 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Gas-phase Photocatalytic Mineralization of n-Hexane over N-doped TiO2 Nanoparticles under Visible-Light

نویسندگان [English]

  • Maryam Alord
  • Shahram Sharifnia
  • Mona Akbari
Catalyst Research Center, Chemical Engineering Department, Faculty of Engineering, Razi University, Kermanshah, Iran
چکیده [English]

In this paper, an examination of gas-phase photocatalytic oxidation of n-Hexane into CO2 and H2O using nitrogen modified TiO2 under visible-light is reported. The morphology of photocatalyst samples was characterized through XRD, SEM, XRF, and FTIR analyses, also photooxidized products were identified by GC and FTIR in the gas medium. The SEM analysis resulted that the surface of catalysts did not change significantly by modification. Moreover, results from photocatalytic activity showed that the N-doped TiO2 was able to transform different concentrations of feed into CO2 and H2O under visible-light. A comparison between photocatalytic performances of N-doped TiO2/Visible-light and TiO2/UV showed that the former was more efficient for n-Hexane conversion (93% photocatalytic conversion). Based on the results from FTIR analysis that have proved the formation of some intermediates such as alcohols, aldehydes, ketones, and carboxylic acids, a mechanism study has been done.
 

کلیدواژه‌ها [English]

  • Photocatalytic Mineralization
  • n-Hexane
  • TiO2
  • N-doped
  • Mechanism

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