Environmental Engineering Research

Korean Society of Environmental Engineers (대한환경공학회)
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Degradation and mineralization of violet-3B dye using C-N-codoped TiO2 photocatalyst

  • Putri, Reza Audina (Laboratory of Applied Analytical-Chemistry, Faculty of Mathematic and Natural Sciences, Andalas University) ;
  • Safni, Safni (Laboratory of Applied Analytical-Chemistry, Faculty of Mathematic and Natural Sciences, Andalas University) ;
  • Jamarun, Novesar (Laboratory of Material, Faculty of Mathematic and Natural Sciences, Andalas University) ;
  • Septiani, Upita (Laboratory of Material, Faculty of Mathematic and Natural Sciences, Andalas University) ;
  • Kim, Moon-Kyung (Institute of Health and Environment, Seoul National University) ;
  • Zoh, Kyung-Duk (Institute of Health and Environment, Seoul National University)
  • Received : 2019.05.08
  • Accepted : 2019.08.02
  • Published : 2020.08.31
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Abstract

The present study investigated the photodegradation of synthetic organic dye; violet-3B, without and with the addition of C-N-codoped TiO2 catalyst using a visible halogen-lamp as a light source. The catalyst was synthesized by using a peroxo sol-gel method with free-organic solvent. The effects of initial dye concentration, catalyst dosage, and pH solution on the photodegradation of violet-3B were examined. The efficiency of the photodegradation process for violet-3B dye was higher at neutral to less acidic pH. The kinetics reaction rate of photodegradation of violet-3B dye with the addition of C-N-codoped TiO2 followed pseudo-first order kinetics represented by the Langmuir-Hinshelwood model, and increasing the initial concentration of dyes decreased rate constants of photodegradation. Photodegradation of 5 mg L-1 violet-3B dye achieved 96% color removal within 240 min of irradiation in the presence of C-N-codoped TiO2 catalyst, and approximately 44% TOC was removed as a result of the mineralization.

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References

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