Ultrasound enhanced activity of catalytic ozonation for degradation of 2-sec-butyl-4,6-dinitrophenol in aqueous solution and wastewater

ABSTRACT:The degradation and mineralization of 2-Sec-butyl-4,6-dinitrophenol (DNBP) in the aqueous solution was investigated by various advanced oxidation processes including US, US/TiO2, O3, O3/TiO2, O3/US and US/O3/TiO2. The obtained results revealed that all processes obeyed pseudo-first order kinetics and the coupled US/O3/TiO2 process was the most efficient method for the removal of the pollutant with high synergistic effect. Then, the effect of major operational parameters, such as the initial DNBP concentration, ozone and TiO2 dosage, US power and pH, on the efficiency of the significant coupled process was studied. Total organic carbon (TOC) was applied for monitoring the mineralization and lower rate constants were obtained and compared to the degradation rate constants. Finally, four degradation intermediates were identified by GC-MS method and the mineralization of petrochemical wastewater was monitored by chemical oxygen demand (COD) under optimized conditions.