Elimination d’un colorant par le procédé UV/Chlore

Abstract

Abstract According to strong oxidants, advanced oxidation process (AOPs) are promising processes for the degradation of chemically persistent organic compounds. The UV/Chlorine process is among the most popular in practical applications. The present work aims to study the degradation of Rhodamine B by the UV/Chlorine process in an alkaline solution (pH=11). Furthermore, this study reveals that UV radiation clearly enhances the degradation rate of the UV/Chlorine process. The photo decomposition of chlorine is faster at higher pH values because OCl- absorbs more light at λ = 365 nm. Treatment condition effects, including pH, chlorine dosage, Rhodamine B and temperature by chlorination alone and UV/Chlorine process were considered to estimate the performance of RhB removal by UV/Chlorine (T=25 °C. pH=11. C0= 5 ppm. [Chlorine] = 1000 μM). Besides, reactive chlorine species significantly contributed to the RhB degradation, as confirmed by the radical scavenger tests. The reaction medium temperature may constitute a crucial factor for the removal of UV/Chlorine. The impact of several inorganic salts (NaCl, Na2SO4, NaCO3, NaNO3, KBr and Na2SO3) was assessed. No significant effect of saturation gases (Argon, air, N2 and O2) on the degradation of RhB by UV/Chlorine systems was found. Eventually, the removal of Rhodamine B was monitored by UV/Vis spectrophotometry and its mineralization is valorized by measuring the total organic carbon (TOC). The findings show that the most efficient oxidation system is UV/Chlorin