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Degradation of dimethyl sulfoxide through fluidized-bed Fenton process: kinetic analysis
Chen, T.-C.; Matira, E. M.; Lu, M.-C. & Dalida, M. L. P.
Abstract
In this study, fluidized-bed Fenton process
(FBF) was used to degrade dimethyl sulfoxide (DMSO),
one of the most widely used solvents. Oxidation by Fenton’s
reagent, Fe+2 and H2O2, is one of the cheapest
advanced oxidation processes due to the high availability
of the reagents. FBF is a modified approach that reduces
the large amount of iron oxide sludge formed in conventional
Fenton process. The optimal treatment efficiencies
by FBF with 2 h of reaction were 95.22 % of DMSO
degradation and 34.38 % of COD removal at the conditions
of 5 mM DMSO, 68.97 g/L SiO2 carrier, pHinitial 3.0,
5 mM Fe2+, and 32.5 mM H2O2. The kinetic study was
also done to investigate the two stages involved in the
oxidation. The first stage fitted the zero reaction order with
overall initial rate’s apparent rate constant, k1, of -0.099.
The second stage fitted the first order of DMSO degradation,
with rate constant, k2, of -0.0005.
Keywords
Fluidized-bed Fenton process; Dimethyl sulfoxide; Kinetic model
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