حذف کاتالیزوری نوری ماده رنگزای آزویی اسید قرمز 14 از آب به‌وسیله نانوکامپوزیت مغناطیسی TiO2/Fe3O4/CNT

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس

2 گروه مهندسی محیط‌زیست، دانشکده مهندسی عمران و محیط‌زیست، دانشگاه تربیت مدرس

3 گروه مهندسی محیط‌زیست، دانشکده مهندسی عمران و محیط‌زیست، دانشگاه تربیت مدرس

چکیده

اسید قرمز 14 یک نوع ماده رنگزای آزویی است که کاربرد وسیعی در صنایع نساجی دارد و با توجه به مصرف بالای آن، تهدیدی جدی برای محیط زیست به شمار می‌آید، به همین دلیل در سال­های اخیر تحقیقات زیادی پیرامون حذف مواد رنگزای آزو از آب انجام شده است.در این تحقیق نانوکامپوزیت  TiO2/Fe3O4/CNTبا یک روش سونوشیمی تهیه و حذف فوتوکاتالیستی ماده رنگزای اسید قرمز 14 با آن در یک راکتور ناپیوسته و به روش OFAT بررسی شد. توصیف ریخت و ساختار نانوکامپوزیت با آزمون­های FESEM و EDS انجام گرفت. شرایط بهینه عوامل مؤثر بر فرآیند شامل، غلظت ماده رنگزا 50 میلی‌گرم ­بر لیتر، غلظت نانوکامپوزیت g/l 0.5، 7 =pH، میزان اکسیژن محلول 7.4 میلی­گرم­بر­لیتر، شدت تابش W/m2 120 و زمان واکنش 6 ساعت شد که در این شرایط و تحت تابش نور مرئی ناشی از لامپ زنون W 55 بازده حذف ماده رنگزای اسید قرمز 14 توسط نانوکامپوزیت TiO2/Fe3O4/CNT برابر 95.63% اندازه­گیری شد همچنین حذف کاتالیزوری نوری ماده رنگزا توسط نانوکامپوزیت TiO2/Fe3O4بررسی و مشاهده شد نانوکامپوزیت TiO2/Fe3O4/CNT بازده بهتری در حذف ماده رنگزا نسبت به نانوکامپوزیت TiO2/Fe3O4 دارد. در بررسی سینتیک واکنش نیز سازوکار حذف ماده رنگزابا ضریب رگرسیون 0.9597 بیشترین هم‌پوشانی را با واکنش شبه مرتبه اول داشت.

کلیدواژه‌ها


عنوان مقاله [English]

Photocatalytic Removal of Azo Dye Acid Red 14 from Water By Magnetic Nanocomposite Tio2/Fe3o4/Cnt

نویسندگان [English]

  • A. Vakili Tajareh 1
  • H. Ganjidoust 2
  • B. Ayati 3
1 Civil and Environmental Eng. Faculty, Tarbiat Modares University
2 Civil and Environmental Eng. Faculty, Tarbiat Modares University
3 Civil and Environmental Eng. Faculty, Tarbiat Modares University
چکیده [English]

Acid red 14 is an azo dye which is used widely in textile industry and due to its high consumption, is a serious environmental hazard so that in recent years, a lot of research has been done on the photocatalytic removal of azo dyes from water with nanocomposites. In this research, TiO2/Fe3O4/CNT nanocomposite was synthesized with the sonochemical method and the photocatalytic removal of acid red 14 dye was investigated in a batch reactor by OFAT method. The morphology and structure of the nanocomposite were characterized by FESEM and EDS analysis. The optimum efficiency of 96.53 for AR14 was achieved under following conditions: dye concentration of 50 mg/L, nanocomposite concentration of 0.5 gr/L, Dissolved oxygen concentration of 7.4 mg/L, pH= 7, 120 W/m2 irradiation intensity and the reaction time 6 hours. Also, the removal of photocatalytic dyes by TiO2/Fe3O4 nanocomposite showed TiO2/Fe3O4/CNT nanocomposites had better performance in dye removal than TiO2/Fe3O4 nanocomposite. It was also found that the dye removal mechanism with a regression coefficient of 0.9597 had the most overlap with the pseudo first-order reaction.

کلیدواژه‌ها [English]

  • Photocatalytic
  • Magnetic nanocomposite
  • Acid Red 14
  • Azo Dyes
  • TiO2/Fe3O4/CNT
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