حذف ماده رنگزای کاتیونی با استفاده ازنانوذرات مغناطیس و الکترودهای کربنی اصلاح شده با اکسیدگرافن احیا شده به روش الکتروفنتون ناهمگن

نوع مقاله : مقاله پژوهشی

نویسندگان

دانشکده مهندسی نساجی، دانشگاه صنعتی امیرکبیر، تهران، ایران

چکیده

در این پژوهش، حذف ماده رنگزای کاتیونی متیلن آبی با استفاده از روش الکتروفنتون ناهمگن مورد مطالعه قرار گرفت. بدین منظور از الکترودهای کربنی اصلاح شده با اکسیدگرافن احیاشده، استفاده شد. اکسید گرافن ابتدا به روش هامر تولید شد و سپس توسط احیاکننده‌های شیمیایی به اکسید گرافن احیاشده تبدیل گردید. به منظور تولید یون‌های Fe+2 و Fe+3 که منجر به تولید ذرات فعالی مانند رادیکال هیدروکسیل و آب اکسیژنه می‌شود، از نانو ذرات مغناطیسی Fe3O4 استفاده شد. از Na2SO4 به عنوان الکترولیت برای افزایش جریان درون محلول استفاده شد. همچنین عوامل تاثیرگذار بر روی فرآیند الکتروفنتون مانند pH، جریان محلول (میلی‌آمپر)، مقدار نانوذرات مغناطیس (mg/l) و غلظت ماده رنگزا (mg/l) مورد بررسی قرار گرفت. نتایج حاصل از آزمایشات رنگبری نشان داد که الکترود اصلاح شده، قابلیت بالایی در حذف مواد رنگزای کاتیونی در pH های اسیدی و قلیایی دارد. به طوری که قادر به حذف ماده رنگزا با بازده 99 % در pH اسیدی و بازده 98 % در pH قلیایی در مدت زمان 120 دقیقه است. مقدار بهینه برای pH، غلظت ماده رنگزا، جریان و مقدار نانوذرات مغناطیس به ترتیب 3، 10 mg/l، 0.06 آمپر و 0.08 گرم به­دست آمد. همچنین برای نشان دادن موفقت‌آمیز بودن اصلاح الکترود کربنی در بالا بردن انتقال الکترونی بین محلول و الکترود از آزمون ولتامتری چرخه‌ای استفاده شد. 

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Discoloration of Cationic Dye by Using Reduced Graphene Oxide Modified Carbon Electrode and Magnetite Nanoparticles Within Heterogeneous Electro-fenton Process

نویسندگان [English]

  • A. Gholami Akerdi
  • S. H. Bahrami
  • M. Arami
  • N. Noormohammadi
Textile Engineering Department, Amirkabir University of Technology,, Tehran, Iran
چکیده [English]

In the present research, heterogeneous electro-fenton operation was employed to remove methylene blue (MB) as a cationic dye. To reach the purpose, we used a reduced graphene oxide (rGO) modified carbon electrode. At first, GO was synthesized using modified Hummer’s method, and then rGO nanoparticles were obtained by reducing GO using reducing agents such as hydrazine and ammonia. In order to produce Fe+2 and Fe+3, magnetite nanoparticles (Fe3O4) have been synthesized. Na2SO4 salt was used as an electrolyte to enhance electrical current. And also, some effective parameters such as pH, electrical current, Fe3O4 value and pollutant concentration were studied. The dye removal results showed that the modified electrode has a high potential for cationic dye removal in acidic and alkaline pH so that it can remove MB 99 and 98% in acidic and alkaline pH, respectively. Optimum conditions for dye concentration, magnetic amount, current intensity and pH were 10 mg/L, 0.08 g, 0.06 A and 3, respectively. Furthermore, cyclic voltammetry and dye removal tests were done. The two comparative tests were carried out in order to exhibit more electron transfer capability of the modified electrode than the bare electrode.

کلیدواژه‌ها [English]

  • Cationic dye
  • Magnetic nanoparticles
  • reduced graphene oxide
  • heterogeneous electrofenton
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