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DOI: https://doi.org/10.4491/eer.2019.196
Degradation and mineralization of violet-3B dye using C-N-codoped TiO2 photocatalyst
Reza Audina Putri1, Safni Safni1, Novesar Jamarun2, Upita Septiani2, Moon-Kyung Kim3, and Kyung-Duk Zoh3
1Laboratory of Applied Analytical-Chemistry, Department of Chemistry, Faculty of Mathematic and Natural Sciences, Andalas University, Padang 25163, Indonesia
2Laboratory of Material, Department of Chemistry, Faculty of Mathematic and Natural Sciences, Andalas University, Padang 25163, Indonesia
3Institute of Health and Environment, Seoul National University,Seoul 08826, Korea
Corresponding Author: Safni Safni ,Tel: +62 813-7428-2673, Email: safni@sci.unand.ac.id
Received: May 8, 2019;  Accepted: August 2, 2019.
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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.
Keywords: C-N-codoped TiO2 | HPLC | Kinetics | TOC | Vat-dye | Visible halogen-lamp
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