حذف ترکیبات رنگزا از فاضلاب صنایع نساجی با استفاده از سیستم فتوالکتروکاتالیستی شامل الکترود فولاد زنگ‌نزن و گرافیت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 دانشجوی کارشناسی ارشد مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

2 دانشیار، دانشکده مهندسی عمران و محیط زیست، دانشگاه تربیت مدرس، تهران

چکیده

در این پژوهش فرایند فتوالکتروکاتالیستی در دمای محیط، تحت نور خورشید، با کاتدی از جنس گرافیت و آندی از جنس فولاد زنگ نزن با پوشش نانوکامپوزیت ZnO/TiO2، برای حذف رنگ فاضلاب سنتزی انجام شد و خصوصیات سطح پوشش‌دهی شده از طریق آزمایش SEM مشخص شد. نتایج نشان داد که شرایط بهینه پارامترهای مؤثر بر فرایند، شامل یک میلی‌آمپر بر سانتی‌متر مربع جریان، pH برابر 5/6، عدم هوادهی، 100 میلی‌گرم در لیتر غلظت اولیه رنگزا، 30 سانتی‌متر مربع سطح الکترود، 01/0 مولار غلظت الکترولیت و زمان آزمایش 360 دقیقه است. در این شرایط، کارایی سیستم در حذف رنگزا و COD به‌ترتیب 99 و 97 درصد حاصل شد و میزان انرژی مصرفی به ازای هر ppm رنگزای حذف شده معادل KWh/ppm 15/0 به‌دست آمد. طبق نتایج به‌دست آمده، روش فتوالکتروکاتالیستی به‌دلیل تولید رادیکال‌های هیدروکسیل، سوپراکسید و غیره، روشی قدرتمند در حذف ترکیبات آلی به‌ ویژه فاضلاب حاوی رنگزا و آلاینده‌های مقاوم به شمار می‌آید و همچنین می‌تواند به‌منظور کاهش هزینه‌های اجرایی به‌عنوان پیش‌تصفیه مورد استفاده قرار گیرد.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Investigation of Dye Removal Efficiency of the Photoelectrocatalytic System Using Graphite and Stainless Steel as Electrodes

نویسندگان [English]

  • Mohammad Ghalebizadeh 1
  • Bita Ayati 2
1 MSc Student of Civil and Environmental Engineering, Tarbiat Modares University, Tehran
2 Assoc. Prof., Faculty of Civil and Environmental Engineering, Tarbiat Modares University, Tehran
چکیده [English]

The removal of Acid Orange 7 by the photoelectrocatalytic process was investigated at ambient temperature under solar irradiation using graphite as the cathode and stainless steel coated with the ZnO/TiO2 nanocomposite as the anode. The microstructure of the ZnO/TiO2 coated electrode was characterized by the SEM test. The results revealed dye and COD removal efficiencies of 99% and 97%, respectively, over a period of 360 minutes. The best performance was achieved in 360 minutes with no aeration at a current of 1 mA/cm2, an initial dye concentration of 100 mg/L, an electrode surface area of 30 cm2, and an electrolyte concentration of 0.01 M; energy consumption under these optimum conditions was 0.15 KWh/ppm. It may be concluded that the photoelectrocatalytic process is well capable of removing organic compounds, especially textile effluents containing dyes and non-degradable contaminants, due to its ability to produce hydroxyl radicals, superoxide, etc. Thus, the technique may be recommended for use as a pre-treatment process to reduce operational costs.

کلیدواژه‌ها [English]

  • Textile Dye
  • Photoelectrocatalytic
  • Nanocamposite ZnO/TiO2
  • Electrode Area
  • Electrolyte Concentration
  • Energy Cosumption
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