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IRON-PEROXYMONOSULFATE: A NOVEL SULFATE RADICAL BASED ADVANCED OXIDATION TECHNOLOGY FOR DEGRADATION OF PCBS
Citation:
RASTOGI, A., S. R. AL-ABED, AND D. D. DIONYSIOU. IRON-PEROXYMONOSULFATE: A NOVEL SULFATE RADICAL BASED ADVANCED OXIDATION TECHNOLOGY FOR DEGRADATION OF PCBS. Presented at The 12th International Conference on Advanced Oxidation Technologies for Treatment of Water, Air and Soil, Pittsburgh, PA, September 25 - 28, 2006.
Impact/Purpose:
To inform the public.
Description:
This study investigates the degradation of recalcitrant polychlorinated biphenyl (PCBs) using sulfate radical-based advanced oxidation technologies. Sulfate radicals are generated through coupling of peroxymonosulfate (PMS) with iron (Fe(II), Fe(III)). Sulfate radicals have very high oxidation potential (2.5-3.1 V, depending on pH) and once generated, they can quickly destroy most of the organic compounds. High aqueous stability of oxidant (PMS) in combination with environmental friendly nature of iron makes this catalytic oxidation process a promising choice among the advanced oxidation processes. The effectiveness of the process was evaluated based on the degradation of a model polychlorinated biphenyl such as 2-chlorobiphenyl and total organic carbon (TOC) removal. The kinetics of 2-chlorobiphenyl degradation along with the effect of oxidant and catalyst concentrations on the degradation efficiency was studied. The impact of pH and buffering species on process efficiency will be presented. Radical identification studies with specific alcohols as quenching agent will also be presented.