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بررسی کارایی فرایند اکسیداسیون پیشرفته بر پایه ازن زنی کاتالیستی در حضور نانوذرات اکسید روی سنتز شده (ZnO) در حذف ترکیبات آلی فرار (VOCs) در هوای آلوده

نوع مقاله : Research Paper

نویسندگان

دانشکده علوم و فنون دریایی، آزاد اسلامی تهران شمال

چکیده

چکیده
زمینه و هدف: انتشار ترکیبات آلی فرار از منابع ثابت و متحرک، باعث افزایش غلظت زمینه­ای این ترکیبات در محیط زیست می­شود. این ترکیبات دارای پتانسیل ایجاد خطر برای محیط زیست و سلامتی انسان هستند. اتخاذ روش‌های مدیریتی و مهندسی در کنترل انتشار این آلاینده­ها به امری ضروری تبدیل شده است. مطالعه حاضر با هدف استفاده از فرآیند اکسیداسیون پیشرفته ازن­زنی کاتالیستی جهت کاهش غلظت این آلاینده­ها در خروجی صنایع انجام شد.
مواد و روش‌ها: در این مطالعه تجربی از فرآیند ازن­زنی در حضور بستر کاتالیستی حاوی نانوکامپوزیت­های نانوکامپوزیت اکسید روی (ZnO) پوشش داده شده بر روی زئولیت جهت تصفیه هوای آلوده به ترکیبات BTEX به‌عنوان شاخص­های ترکیبات آلی فرار در مقیاس آزمایشگاهی استفاده شد. در این مطالعه، ابتدا سنتز نانوکامپوزیت بر اساس روش هم‌رسوبی شیمیایی صورت گرفت. آنالیزهای SEM (میکروسکوپ الکترونی روبشی)، XRD (الگوی پراش اشعه ایکس)، BET و FT-IR (طیف سنج مادون قرمز فوریه) جهت بررسی خصوصیات ساختاری نانوکامپوزیت انجام شد. متغیرهای غلظت اولیه BTEX (50-200 پی پی ام)، دبی (5-20 لیتر در ساعت)، رطوبت (0-75%) و غلظت ازن (25/0 -1 گرم در ساعت) مورد بررسی قرار گرفتند. مقدار غلظت ترکیبات BTEX بر اساس دستورالعمل 1501 NIOSH توسط دستگاه گاز کروماتوگرافی اندازه‌گیری شد.
یافته‌ها: نتایج آنالیزهای SEM، XRD، BET و FT-IR بیانگر سنتز مناسب نانوکامپوزیت بود. بر اساس نتایج به‌دست آمده آزمایشگاهی، شرایط بهینه فرآیند شامل: غلظت اولیه آلاینده‌ها برابر 50 پی پی ام، دبی ورودی جریان هوای آلوده برابر 5 لیتر در ساعت، رطوبت نسبی هوا 25-35% و غلظت ازن ورودی برابر 1 گرم در ساعت بود. در این شرایط، کارایی حذف ترکیبات بنزن، تولوئن، اتیل بنزن و زایلن به‌ترتیب 98، 96، 92 و 91 درصد به‌دست آمد. فرآیندهای ازن‌زنی ساده و جذب سطحی، کارایی پایین‌تری نسبت به ازن‌زنی کاتالیزوری دارند و اثر هم‌افزایی فرآیند مشهود است.
نتیجه‌گیری: فرآیند ازن زنی کاتالیزوری، توانایی کاهش غلظت ترکیبات BTEX را به حد استاندارد تعیین شده دارد. از این فرآیند می‌توان جهت تصفیه جریان هوای آلوده صنایع منتشر کننده BTEX که تهدید کننده سلامت انسان و محیط زیست است، استفاده نمود.
نوع مقاله: پژوهشی
کلید واژه‌ها: ازن‌زنی، اکسید روی، ترکیبات آلی فرار، نانوکامپوزیت، هوای آلوده، BTEX

کلیدواژه‌ها

عنوان مقاله [English]

Evaluation of the Efficiency of Advanced Oxidation Process Based on Catalytic Ozonation in the Presence of Synthesized Zinc Oxide (Zno) Nanoparticles in the Removal of Volatile Organic Compounds (Vocs) in Polluted Air

نویسندگان [English]

  • Amir Shojaei
  • Hossein Ghafourian
  • Linda Yadegarian
  • Kamran Lari
  • Mohammadtaghi Sadatipour

Islamic Azad University, North Tehran Branch, Faculty of Marine Science and Technology

چکیده [English]

Abstract
Background and Aim :The release of volatile organic compounds from stationary and mobile sources increases the concentration of these compounds in the environment. These compounds are potentially hazardous to the environment and human health. The selection of management and engineering systems has become essential for controlling the release of these pollutants. The aim of this study was to use an advanced catalytic ozonation process to reduce the concentration of these pollutants in industrial emissions.
Materials and Methods:In this experimental study, the ozonation process in the presence of a catalyst bed containing ZnO nanocomposites coated on zeolite was used to treat the air contaminated with BTEX compounds as indicators of volatile organic compounds on a laboratory scale. In this study, the synthesis of nanocomposites was done using the chemical co-deposition method. SEM, XRD, BET, and FT-IR analyses were performed to investigate the structural properties of the nanocomposites. The initial concentrations of BTEX (50-200 ppm), the flow of the polluted air (5-20 l/h), humidity (0-75%), and ozone dose (0.25-1 g/h) were studied. The concentration of the BTEX compounds was measured by a Gas Chromatography (GC) device according to the NIOSH Guideline 1501.
Results:The results of SEM, XRD, BET, and FT-IR indicated the proper synthesis of nanocomposites. Based on the laboratory results, the optimal process conditions were the initial concentration of pollutants equal to 50 ppm, the inlet flow rate of polluted air equal to 5 l/h, relative humidity of 25-35%, and the inlet concentration of ozone equal to 1 g/h. Under these conditions, the removal efficiencies of benzene, toluene, ethylbenzene, and xylene were 98, 96, 92, and 91%, respectively. Simple ozonation and adsorption processes had lower efficiencies than catalytic ozonation and the synergistic effect of the process was evident.
Conclusion:Based on the obtained results, the process has the ability to reduce the concentration of BTEX compounds to the specified standards. This process can be used to treat polluted air in BTEX emitting industries that threaten human health and the environment.
Article type:Research article
Keywords: Volatile Organic Compounds; BTEX; Nanocomposite; Zinc Oxide; Ozone; Polluted Air

کلیدواژه‌ها [English]

  • Volatile Organic Compounds
  • BTEX
  • Nanocomposite
  • Zinc Oxide
  • Ozone
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مجله پژوهش در بهداشت محیط
دوره 7، شماره 1
تیر 1400
صفحه 27-41
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هم رسانی
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