Journal of Interfaces, Thin Films, and Low dimensional systems

Visible light photocatalytic activity of MWCNT/TiO2 using the degradation of methylene blue

Document Type : Original Article

Authors

1 Department of Physics, Alzahra University, Tehran, 199389, I.R. Iran

2 Department of Physics, Roudehen Branch, Islamic Azad University, Roudehen, I.R. Iran

Abstract

Multi-walled carbon nanotubes (MWCNT)-doped TiO2 thin films were synthesized by the dip-coating method. The obtained products were characterized by SEM, EDX, XRD, and UV-vis absorption spectroscopy. The XRD patterns showed the presence of anatase phase. Absorption spectrum of MWCNT-doped TiO2 revealed a red shift in the optical absorption edge due to carbon doping. The photocatalytic properties were investigated using methylene blue (MB) degradation under visible light (400-700 nm). MWCNT/TiO2 thin films exhibited significantly higher photocatalytic activity as compared to undoped TiO2 thin films due to reduction of the rate of electron-hole recombination by doping carbon. Photocatalytic activity studies with different light source (white light and blue light) indicated a significant enhancement in photocatalytic removal under white light irradiation.

Keywords

Article Title [Persian]

فعالیت فتو کاتالیستی نور مریی MWCNT/TiO2 با استفاده از تخریب متیلن بلو

Authors [Persian]

  • سمیرا محمد درویش 1
  • عبدالله مرتضی علی 1
  • سعیده رمضانی ثانی 2

1 گروه فیزیک، دانشکده فیزیک و شیمی، دانشگاه الزهرا، تهران، ایران

2 گروه فیزیک، دانشگاه آزاد اسلامی، واحد رودهن، رودهن، ایران

Abstract [Persian]

در این پژوهش، لایه­­های نازک دی اکسید تیتانیوم (TiO2) آلاییده شده با نانو لوله­های کربنی چند دیواره (MWCNT)، با استفاده از روش غوطه­ وری تهیه شدند. نمونه های به دست آمده توسط SEM و EDX و XRD و طیف­سنجی جذب UV-Vis مشخصه ­یابی شدند. تحلیل­های XRD حضور فاز آناتاز را نشان دادند. در طیف جذب MWCNT/TiO2 به دلیل آلایش با کربن انتقال لبه جذب به سمت ناحیه قرمز مشاهده شد. به منظور بررسی خواص فوتوکاتالیستی لایه ­ها، تخریب محلول متیلن بلو (MB) در نور مرئی (700-400 نانومتر) توسط کاتالیست MWCNT/TiO2  انجام شد. لایه­های نازک MWCNT/TiO2 فعالیت فوتوکاتالیستی بالاتری نسبت به لایه­ های نازک TiO2 خالص نشان دادند که ناشی از کاهش سرعت بازترکیب الکترون–حفره است. تخریب محلول متیلن بلو با منابع نوری مختلف (نور سفید و نورآبی) نشان داد که نمونه ­ها تحت تابش نورسفید فعالیت فوتوکاتالیستی بیشتری دارند.

Keywords [Persian]

  • نانو لوله های کربنی/دی اکسید تیتانیوم
  • فوتوکاتالیستی
  • نور مرئی
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Journal of Interfaces, Thin Films, and Low dimensional systems
Volume 2, Issue 2
May 2019
Pages 149-156