کارایی فتوکاتالیست نانواکسید تیتانیوم تثبیت شده بر زئولیت Fe-ZSM-5 در حذف آلاینده‌های آلی پساب پالایشگاه نفت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی دکترای محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور، مازندران

2 دانشیار گروه محیط زیست، دانشکده منابع طبیعی و علوم دریایی، دانشگاه تربیت مدرس، نور، مازندران

3 استادیار گروه شیمی کاربردی، دانشکده شیمی، دانشگاه رازی، کرمانشاه

چکیده

پساب پالایشگاه نفت حاوی غلظت‌های متفاوتی از هیدروکربن‌های نفتی آروماتیک و آلیفاتیک است. با توجه به اینکه محتوای آروماتیک سمی بوده و با تصفیه متداول به راحتی حذف نمی‌شود، برای حذف این دسته از آلاینده‌ها، روش‌های پیشرفته نیاز است. در این مطالعه حذف و تخریب فتوکاتالیتیکی آلاینده‌های آلی پساب پالایشگاه نفت مورد بررسی قرار گرفت. ابتدا فتوکاتالیست TiO2-Fe-ZSM-5 با نشاندن TiO2 در ساختار زئولیت Fe-ZSM-5 سنتزی تهیه شد. سپس از ‌روش‌های پراش اشعه ایکس، فلورسانس اشعه ایکس، طیف‌سنجی مادون قرمز فوریه، میکروسکوپ الکترونی روبشی، میکروسکوپ الکترونی عبوری و جذب و واجذب نیتروژن برای بررسی خصوصیات ساختاری، فیزیکی و شیمیایی محصولات تولید شده استفاده شد. فتوکاتالیست TiO2-Fe-ZSM-5 با خلوص بالا، درصد TiO2 برابر 28/29 و مساحت سطح ویژه برابر 6/304 مترمربع بر گرم سنتز شد. در ادامه، فتوکاتالیست TiO2-Fe-ZSM-5 سنتزی به‌منظور حذف ترکیبات آلی و تصفیه پساب پالایشگاه نفت بندرعباس مورد استفاده قرار گرفت. مقدار بیشینه 80 درصد حذف ترکیبات آلی در شرایط بهینه pH برابر 4، دز فتوکاتالیست برابر 3 گرم در لیتر، دما برابر 45 درجه سلسیوس و زمان تابش نور ماوراء بنفش برابر 240 دقیقه به‌دست آمد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Efficiency of Immobilized Nano TiO2 on Fe-ZSM-5 Zeolite in Organic Pollutants Removal from Petroleum Refinery Wastewater

نویسندگان [English]

  • Zahra Ghasemi 1
  • Habibollah Younesi 2
  • Aliakbar Zinatizadeh 3
1 PhD Student of Environment, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Mazandaran
2 Assoc. Prof. of Environmental Sciences, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University, Noor, Mazandaran
3 Ass. Prof. of Applied Chemistry, Faculty of Chemistry, Razi University, Kermanshah
چکیده [English]

Effluents from oil refineries contain different concentrations of aliphatic and aromatic hydrocarbons. Given the toxicity of the aromatic fraction that is not readily degradable by conventional treatment processes, advanced processes are required for their removal. This study investigated the photocatalytic degradation and removal of organic contaminants from oil refinery effluents. For this purpose, TiO2-Fe-ZSM-5 photocatalyst was initially produced by immobilizing TiO2 into the structure of synthetic Fe-ZSM-5 zeolite. X-Ray diffraction, X-Ray fluorescence, Fourier transform infrared (FTIR) spectroscometry, scanning electron microscopy, transmission electron microscopy, and nitrogen sorption/desorption techniques were then employed to determine the structural and physicochemical properties of the products. High purity TiO2-Fe-ZSM-5 photocatalyst with a TiO2 percentage of 29.28 and a specific surface area of 304.6 m2g-1 was synthesized. The photocatalyst thus obtained was then applied for the removal of organic pollutants from the effluent of Bandar Abbas Oil Refinery. A maximum COD reduction of more than 80% was achieved under optimum conditions (i.e., pH: 4, catalyst concentration: 3 g/l, temperature: 45 °C, and UV exposure time: 240 min).

کلیدواژه‌ها [English]

  • photocatalyst
  • Fe-ZSM-5 Zeolite
  • TiO2
  • Photocatalytic Treatment
  • Petroleum Refinery Wastewater
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