Degradation of direct red-81 and direct yellow-27 by photolysis with UV-light and solar irradiation using C-N-codoped TiO2

Safni Safni; Deliza; Deby Anggraini; Rahmi Sari Dewi; Hasnah Ulia; Diana V; a Wellia

Abstract

Degradation of direct red-81 and direct yellow-27 by photolysis with UV-light and solar irradiation using C-N-codoped TiO2

Author(s): Safni Safni, Deliza, Deby Anggraini, Rahmi Sari Dewi, Hasnah Ulia and Diana Vanda Wellia

Direct Red-81 (C₂₈H₁₉N₅Na₂O₈S₂) and Direct Yellow-27 (C₂₈H₁₉N₅Na₂O₆S₄) are non-biodegradable organic compound containing azo group and confirmed carcinogenic. Direct Red-81 and Direct Yellow-27 were degraded by photolysis method under 10 watt UV-light irradiation (λ=365 nm) and solar irradiationwith and without C-Ncodoped TiO₂ catalyst. The dyes solution was analyzed\by UV-Vis spectrophotometer at λ 300-800nm. The optimum mass of C-N-codoped TiO₂catalyst was 10 mg. From those methods, concluding solar irradiation method enhanced better degradation than UV-light irradiation, Direct Red-81 and Direct Yellow-27 were degraded 17.37 % and 8.72 % by solar irradiation and the degradation percentage increased to 75.63 % and 71.52 % by the addition of C-Ncodoped TiO₂ catalyst for 120 minutes.