Active Chlorine System Based on In-Situ Electrogeneration for Organic Matters Degradation in Wastewater
A Ti/RuO2-IrO2-Ti electrochemical system with Ti/RuO2-IrO2 as the anode and pure titanium plate as the cathode was utilized for electrochemical degradation of RhB simulated wastewater containing chlorinated salt.This paper discussed the effects of electrolyte type,electrolyte concentration,current density and initial pH value on the decolorization rate of RhB,and the results showed that the decolorization rate of RhB was higher when the electrolyte was NaCl.The increase in current density was conducive to the decolorization of RhB and the generation of activated chlorine.Additionally,the decolorization rate of the RhB solution was much higher in acidic conditions than in alkaline conditions.The electrode reactions of different electrolytes and the RhB system were being analyzed by anodic voltammetry.The reasons for the difference in the decolorization effect of RhB by different electrolyte systems were being speculated,and the ultraviolet spectrum analysis of the RhB solution was being carried out during the reaction.The results showed that the intensity of the absorption peak reflecting the chromaticity profile of RhB(λ=554 nm)was decreasing with time in the NaCl system,while the intensity of the absorption peak at λ=283.5 nm reflecting the conjugated structure of RhB was increasing.This indicated that RhB was not completely removed but was being attacked by active chlorine to generate intermediate products containing conjugated structures.
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