title: Degradation of reactive blue 19 by needle-plate non-thermal plasma in different gas atmospheres: Kinetics and responsible active species study assisted by CFD calculations.
abstract: This study investigated the degradation of a model organic compound, reactive blue (RB-19), in aqueous solution using a needle-plate non-thermal plasma (NTP) reactor, which was operated using three gas atmospheres (Ar, air, O2) at room temperature and atmospheric pressure. The relative discharge and degradation parameters, including the peak to peak applied voltage, power, ozone generation, pH, decolorization rates, energy density and the total organic carbon (TOC) reduction were analyzed to determine the various dye removal efficiencies. The decolorization rate for Ar, air and O2 were 59.9%, 49.6% and 89.8% respectively at the energy density of 100 kJ/L. The best TOC reduction was displayed by Ar with about 8.8% decrease, and 0% with O2 and air atmospheres. This phenomenon could be explained by the formation of OH• and O3 in the Ar and O2 atmospheres, which are responsible for increased mineralization and efficient decolorization. A one-dimension model was developed using software COMSOL to simulate the RB-19-ozone reaction and verify the experiments by comparing the simulated and experimental results. It was determined that ozone plays the most important role in the dye removal process, and the ozone contribution rate ranged from 0.67 to 0.82.
authors.affiliation: School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
authors.forename: Yu
authors.initials: Y
authors.lastname: Sun
authors.affiliation: School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China. Electronic address: liuyanan@dhu.edu.cn.
authors.forename: Yanan
authors.initials: Y
authors.lastname: Liu
authors.affiliation: School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
authors.forename: Rui
authors.initials: R
authors.lastname: Li
authors.affiliation: School of Environmental Science and Engineering, Donghua University, 2999 North Renmin Road, Shanghai 201620, China.
authors.forename: Gang
authors.initials: G
authors.lastname: Xue
authors.affiliation: UPMC Univ Paris 06, EA 3492, Laboratoire de Génie des Procédés et Traitements de Surface, 11 rue Pierre et Marie Curie, 75005 Paris, France.
authors.forename: Stéphanie
authors.initials: S
authors.lastname: Ognier
mesh_terms: D000880:Anthraquinones / Q000032:analysis* / Q000737:chemistry; D001128:Argon / Q000737:chemistry; D004396:Coloring Agents / Q000032:analysis* / Q000737:chemistry; D007700:Kinetics; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D010100:Oxygen / Q000737:chemistry; D010126:Ozone / Q000737:chemistry*; D058626:Plasma Gases / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000032:analysis* / Q000737:chemistry; D018508:Water Purification / Q000379:methods*
chemical_list: D000880:Anthraquinones; D004396:Coloring Agents; D058626:Plasma Gases; D014874:Water Pollutants, Chemical; D010126:Ozone; D001128:Argon; C024758:Remazol Brilliant Blue R; D010100:Oxygen
keywords: COMSOL; Energy density; Non-thermal plasma; Ozone; RB-19