رنگ‌بری و معدنی سازی رنگ‌زای راکتیو RO16 و پساب نساجی با فرآیند نانوفتوکاتالیزی در مقیاس پایلوت

نوع مقاله: مقاله پژوهشی

نویسندگان

1 عضو هیئت علمی گروه بهداشت محیط، دانشگاه علوم پزشکی شاهرود

2 استادیار دانشکده بهداشت، دانشگاه علوم پزشکی تهران

3 کارشناس آزمایشگاه شیمی، دانشکده بهداشت، دانشگاه علوم پزشکی شاهرود

چکیده

فرایند نانوفتوکاتالیستی با استفاده از نیمه رساناهای با ساختار نانو، یکی از تکنولوژی‌هایی است که برای اکسیداسیون تخریبی مواد آلی همچون رنگها استفاده می‌شود. در این تحقیق اکسیداسیون فتوکاتالیستی محلول آبی رنگزای Reactive Orange 16 با استفاده از تابش نور UV در حضور TiO2 مورد بررسی قرار گرفت. فوتون‌های لازم، وقتی که غلظت TiO2 به 0/4 گرم بر لیتر افزایش یافت، به‌صورت کامل جذب ‌شدند. راندمان تجزیه رنگ با افزایش غلظت رنگ کاهش می‌یابد، زیرا در غلظتهای بالای رنگ، مکان‌های فعال به‌وسیله یون‌های رنگ پوشیده می‌شوند در نتیجه تولید رادیکال‌های  OHروی سطح کاتالیست کاهش می‌یابد. دلیل ممکن دیگر برای این نتایج ،اثر UV-Screening خود رنگ است. اثرات بازدانده آنیون‌ها، در واقع واکنش حفره‌های مثبت و رادیکال هیدروکسیل با آنیون‌ها است که به‌عنوان خورنده‌های OH و hVB+ رفتار می‌کنند و باعث طولانی شدن حذف رنگ می‌شوند. سطح TiO2 در محیط اسیدی بار مثبت دارد (6/8pH

کلیدواژه‌ها


عنوان مقاله [English]

A Pilot Study of RO16 Discoloration and Mineralization in Textile Effluents Using the Nanophotocatalytic Process

نویسندگان [English]

  • Marjan Ghanbarian 1
  • Amir Hossein Mahvi 2
  • Ramin Nabizadeh 2
  • Saeedeh Saeedniya 3
1 Faculty Member, Department of Environmental Health, Shahroud University of Medical Sciences
2 Assis. Prof. of Environmental Health, Tehran University of Medical Sciences
3 Lab Instructor, Department of Environmental Health, Shahroud University of Medical Sciences
چکیده [English]

The nanophotocatalytic process using nano-structured semiconductors is one of the techniques used for the destructive oxidation of organic compounds such as dyes. The photocatalytic oxidation of Reactive Orange 16 aqueous solution, applied in the textile industry, was assessed by UV ray irradiation in the presence of TiO2 nanoparticles. It was found that the photons required for the process were completely absorbed when TiO2 concentration reached 0.4 g/L. Degradation of paint decreased with increasing TiO2 concentration. It is suggested that at very high concentrations, the active points on ions are covered and the number of radicals like ˙OH will, therefore, decrease on the surface of catalysts. Another explanation for this state of affairs is that UV screening may have the same function. The negative action of anions may be explained by the reaction of positive cavities accomplished by hydroxyl radicals with anions. This reaction can be described as corrosive for ˙OH and hVB+, which can prolong the process of color removal. The TiO2 in an acidic environment has a positive charge (pH

کلیدواژه‌ها [English]

  • Reactive Orange 16
  • UV Irradiation
  • Titanium dioxide nanoparticle
  • Discoloration
  • Mineralization
  • COD
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