화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.33, 276-287, January, 2016
Mechanistic analysis of sono-photolysis degradation of carmoisine
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The hybrid advanced oxidation process (AOP) of sono-photolysis, in which sonication and photolysis (UV-C/H2O2) are applied simultaneously, is known to give effective degradation of several biorecalcitrant pollutants. This study has attempted to identify the links and interactions between the mechanisms of individual AOPs of sonolysis and photolysis, when applied simultaneously. Experimental results have been analyzed concurrently with the simulations of cavitation bubble dynamics. It is revealed that oxidizing (-OH) radicals generated through photolysis contribute mostly to degradation reactions. Due to highly sporadic nature of transient cavitation, the contribution of sonolysis to degradation is rather subordinate as compared to photolysis. Nonetheless, faster degradation and higher mineralization in sono-photolysis, as compared to photolysis alone, essentially points at supportive role of ultrasound in the hybrid AOP. Addition of electrolytes (or salt) to the reaction mixture during sonophotolysis treatment causes effective partitioning of the pollutant molecules in the interfacial region of transient cavitation bubble, which results in further enhancement of degradation kinetics and mineralization. Although the present study has employed Carmoisine as model pollutant, the mechanistic principles identified in this study, and their manifestations in terms of degradation/ mineralization of pollutants are applicable to any other bio-recalcitrant pollutant.
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