title: Degradation of methylparaben in water by corona plasma coupled with ozonation.
abstract: The degradation of methylparaben (MeP) in water was investigated using a pulsed corona discharge generated in oxygen, above the liquid. A comparison was made between results obtained in semi-batch corona (SBC) configuration (stationary solution, continuous gas flow) and results obtained in a semi-batch corona with recirculation combined with ozonation (SBCR + O3), where the liquid is continuously circulated between a solution reservoir and the plasma reactor and the effluent gas containing ozone is bubbled through the solution in the reservoir. It was found that MeP was completely degraded after 10-15 min of treatment in both configurations. Oxidation by ozone alone, in the absence of plasma, was a slower process. The energy efficiency for MeP removal (Y MeP) and for mineralization (Y TOC) was significantly higher in the SBCR + O3 configuration (Y MeP = 7.1 g/kWh at 90 % MeP removal and Y TOC = 0.41 g/kWh at 50 % total organic carbon (TOC) removal) than in the SBC configuration (Y MeP = 0.6 g/kWh at 90 % MeP removal and Y TOC = 0.11 g/kWh at 50 % TOC removal).
authors.affiliation: Department of Plasma Physics and Nuclear Fusion, National Institute for Lasers, Plasma and Radiation Physics, Atomistilor Str. 409, Box MG-36, 077125, Magurele-Bucharest, Romania.
authors.forename: D
authors.initials: D
authors.lastname: Dobrin
authors.forename: M
authors.initials: M
authors.lastname: Magureanu
authors.forename: C
authors.initials: C
authors.lastname: Bradu
authors.forename: N B
authors.initials: NB
authors.lastname: Mandache
authors.forename: P
authors.initials: P
authors.lastname: Ionita
authors.forename: V I
authors.initials: VI
authors.lastname: Parvulescu
mesh_terms: D055664:Electrochemical Techniques; D007700:Kinetics; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010126:Ozone / Q000737:chemistry*; D010226:Parabens / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D010226:Parabens; D014874:Water Pollutants, Chemical; D010126:Ozone; C015358:methylparaben; D010100:Oxygen