The oxidation study of 2-propanol using ozone-based advanced oxidation processes

Abstract

In the present study, advanced oxidation processes (AOPs) have been successfully used to decompose isopropyl alcohol (IPA). IPA degradation and its major degradation intermediate, acetone formation and total organic carbon (TOC) removal efficiency were studied using O 3, O 3/UV, H 2O 2/UV, H 2O 2/O 3, and H 2O 2/O 3/UV processes at various physico-chemical conditions. Complete degradation of IPA was noted in AOPs whereas complete acetone decomposition was not observed under the experimental conditions. Ozonation process was strongly enhanced in the presence of UV light, H 2O 2 or in the presence of both oxidants. Ozonation process in the presence of UV light enhancement about 11%, 15%, 28% of IPA decomposition and 20%, 23%, 0% of TOC removal was observed at pH 3, 7, and 10. Similarly, in the presence of H 2O 2 (0.25 g/g) further enhancement of 31%, 50%, 18% of IPA degradation and 26%, 30%, 27% of TOC removal at 180 min was noted at pH 3, 7, and 10, respectively. UV/H 2O 2 process was found to be the least efficient and UV/H 2O 2/O 3 was the most efficient process compared to all other selected AOPs. Acetone was identified as a primary degradation intermediate and subsequently acetic acid, formic acid, and oxalic acid were identified as secondary intermediates. It was concluded that ozone-based AOPs were efficient for IPA degradation in wastewater.