title: Degradation of methyl orange by ozone in the presence of ferrous and persulfate ions in a rotating packed bed.
abstract: This work investigated the degradation of methyl orange by ozone in the presence of ferrous and persulfate ions (O3/Fe(2+)/S2O8(2-)) in a rotating packed bed. The effects of various operating parameters such as initial pH, rotational speed, gas-liquid ratio, ozone inlet concentration and reaction temperature on the degradation rate of methyl orange were studied with an aim to optimize the operation conditions. Results reveal that the degradation rate increased with an increase in rotational speed, gas-liquid ratio and ozone inlet concentration, and reached a maximum at 25 °C and initial pH 4. Contrast experiments involving ozone and ferrous ions (O3/Fe(2+)) were also carried out, and the results show approximately 10% higher degradation rate and COD removal in the O3/Fe(2+)/S2O8(2-) process than in the O3/Fe(2+) process. Additionally, the intermediates of the degradation process were analyzed to ascertain the degradation products.
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Deming
authors.initials: D
authors.lastname: Ge
authors.affiliation: State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
authors.forename: Zequan
authors.initials: Z
authors.lastname: Zeng
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Moses
authors.initials: M
authors.lastname: Arowo
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: zouhk@mail.buct.edu.cn.
authors.forename: Haikui
authors.initials: H
authors.lastname: Zou
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China.
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China; Research Center of the Ministry of Education for High Gravity Engineering and Technology, Beijing University of Chemical Technology, Beijing 100029, China. Electronic address: shaol@mail.buct.edu.cn.
authors.forename: Lei
authors.initials: L
authors.lastname: Shao
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D004396:Coloring Agents / Q000737:chemistry*; D007501:Iron / Q000737:chemistry; D016877:Oxidants / Q000737:chemistry*; D010126:Ozone / Q000737:chemistry*; D017670:Sodium Compounds / Q000737:chemistry; D013431:Sulfates / Q000737:chemistry; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D016877:Oxidants; D017670:Sodium Compounds; D013431:Sulfates; D014874:Water Pollutants, Chemical; D010126:Ozone; C100258:methyl orange; D007501:Iron; C024625:sodium persulfate
keywords: Degradation; Ferrous ion; Methyl orange; Ozone; Persulfate; Rotating packed bed