Add time:08/10/2019         Source:sciencedirect.com

This paper has attempted to identify the physical mechanism of the hybrid advanced oxidation process (HAOP) of sono-photo-ferrioxalate for azo dye decolorization. An approach of coupling experimental results with simulations of cavitation bubble dynamics has been adopted. Concurrent analysis of simulations of cavitation bubble dynamics and experimental results have revealed interesting links between physics of ultrasound/cavitation, and chemistry of decolorization. The role of ultrasound and cavitation in HAOP is revealed to be of physical nature. Oxidizing radicals produced via photo-ferrioxalate system contribute mostly to decolorization. Physical effect of strong micro-convection induced by ultrasound/cavitation in reaction system helps effective utilization of these radicals. Among three radical species, viz. O2•−,•OH and HO2•, produced via photo-ferrioxalate system the contribution of O2•− and HO2• radicals to decolorization is equally significant as that of •OH radical with the highest oxidation potential.

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