حذف فتوکاتالیستی ارتوکلروفنل از محلول‌های آبی با استفاده از مخلوط خاکستر فرار اصلاح شده - دی اکسید تیتانیم

نوع مقاله: مقاله پژوهشی

نویسندگان

1 استاد مرکز تحقیقات مهندسی بهداشت محیط و گروه بهداشت محیط، دانشگاه علوم پزشکی کرمان، کرمان، ایران

2 استاد، گروه مهندسی بهداشت محیط، دانشکده بهداشت، دانشگاه علوم پزشکی تهران، و استاد مرکز تحقیقات کیفیت آب، پژوهشکده محیط زیست دانشگاه علوم پزشکی تهران، تهران، ایران

3 دانشجوی کارشناسی ارشد مهندسی بهداشت محیط، گروه بهداشت محیط، دانشگاه علوم پزشکی کرمان، کرمان، ایران

چکیده

فرایند فتوکاتالیستی به‌عنوان یکی از روش‌های مناسب در حذف ترکیبات فنلی استفاده می‌شود. در این مطالعه از مخلوط خاکستر فرار اصلاح شده دی اکسید تیتانیم برای افزایش راندمان حذف فتوکاتالیستی ارتوکلروفنل استفاده شد. این پژوهش تجربی در شش ماهه اول 1392 در مرکز تحقیقات مهندسی بهداشت محیط دانشگاه علوم پزشکی کرمان انجام گرفت. خاکستر فرار تهیه شده از نیروگاه برق حرارتی زرند کرمان ابتدا با اسید سولفوریک شسته و سپس با پرمنگنات پتاسیم اکسید شد. از مخلوط خاکستر فرار اصلاح شده و TiO2 برای حذف ارتوکلروفنل در حضور نور UV استفاده شد. عوامل موثر بر فرایند حذف بهینه شد.  نتایج نشان داد راندمان حذف ارتوکلروفنل در مخلوط خاکستر فرار اصلاح شده به TiO2 بالاتر از خاکستر فرار اصلاح شده به‌تنهایی و TiO2/UV به‌تنهایی بود. راندمان حذف در شرایط بهینه pH برابر 2 و دمای اتاق (2±29 درجه سلسیوس) و مقدار 6 گرم سوبسترای مخلوط با نسبت 3 به 1 خاکستر فرار اصلاح شده به TiO2 تا 9/98درصد ارتقا یافت. راندمان حذف ارتوکلروفنل در فاضلاب واقعی کارخانه زغال‌شویی زرند 4/88 درصد به‌دست آمد. با توجه به نتایج مثبت به‌دست آمده از استفاده توام خاکستر فرار اصلاح شده و TiO2 در بالا بردن راندمان حذف نمونه واقعی، می‌توان استفاده از این روش را توصیه نمود.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

The Photocatalytic Removal of Ortho Chlorophenol from Aqueous Solution Using Modified Fly Ash - Titanium Dioxide

نویسندگان [English]

  • Mohamad Malakootian 1
  • Alireza Mesdaghinia 2
  • Shima Rezaei 3
1 Professor, Environmental Health Engineering Research Center and Department of Environmental Health, Kerman University of Medical Sciences
2 Prof., Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Water Quality Research Center, Institute for Environmental Research, Tehran University of Medical Sciences, Tehran, Iran
3 MSc Student in Environmental Health Engineering, Department of Environmental Health, Kerman University of Medical Sciences, Kerman, Iran
چکیده [English]

The photocatalytic process is a useful method for the effective removal of phenolic compounds. Conducted in the spring‒summer 2013 at the Engineering Research Center for Environmental Health, Kerman University of Medical Sciences, this experimental study used a modified fly ash‒TiO2 mixture to enhance the photocatalytic removal efficiency of ortho-chlorophenol. Fly ash obatined from the Thermal Power Plant in Zarand, Kerman, was initially washed with sulfuric acid before being oxidized with potassium permanganate. The mixture of modified fly ash and TiO2 was then used for the removal of ortho-chlorophenol in the presence of UV light and the factors involved in the removal process were optimized. It was found that the ortho-chlorophenol removal efficiency recorded by the mixture of modified fly ash and TiO2 was higher than that by each of the modified fly ash or TiO2/UV alone. It was, further, observed that removal efficiency with a modified fly ash to TiO2 ratio of 3:1 rose to 98.8% under optimum conditions (i.e., pH: 2; contact time: 2 h; room temperature (29±2˚C), and a catalyst dose of 0.6 g). The ortho-chlorophenol removal efficiency in real wastewater from the Coal Wash Plant in Zarand was recorded at 88.4%. Based on the results obtained from simultaneous use of modified fly ash and TiO2, the proposed method may be recommended for industrial applications.

کلیدواژه‌ها [English]

  • Ortho-chlorophenol
  • Modified Fly Ash
  • TiO2
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