title: Decolorization of anthraquinone dye Reactive Blue 19 by the combination of persulfate and zero-valent iron.
abstract: Decolorization of anthraquinone dye Reactive Blue 19 (RB19) with sulfate radicals generated in situ from persulfate and zero-valent iron (ZVI) was investigated. The effects of initial solution pH, initial concentration of RB19, ZVI and persulfate, reaction temperature and common dissolved anions were studied. 100% color removal efficiency and 54% TOC removal efficiency were achieved in 45 min with an initial RB19 concentration of 0.1 mM under typical conditions (pH 7.0, 0.8 g L(-1) ZVI, 10 mM persulfate and 30 C). The decolorization efficiency of RB19 increased with higher iron dosage, higher initial persulfate concentration, and higher reaction temperature. It is also an acid driven process. The decolorization process followed pseudo-first order kinetics and the activation energy was 98.1 kJ mol-1. RB19 decolorization was inhibited by common dissolved anions such as CL-, NO3-, H2PO4- and HCO3- since they reacted with sulfate radicals that retarded the oxidation process. The experiment demonstrated that the combination of persulfate and ZVI was a promising technology for the decolorization of dye wastewater.
authors.affiliation: School of Environmental Science and Engineering, South China University of Technology/The Key Lab of Pollution Control and Ecosystem Restoration in Industry Clusters of Ministry of Education/ The Key Laboratory of Environmental Protection and Eco-Remediation of Guangdong Regular Higher Education Institutions, Guangzhou 510006, China.
authors.forename: Chen
authors.initials: C
authors.lastname: Le
authors.forename: Jin-Hua
authors.initials: JH
authors.lastname: Wu
authors.forename: Ping
authors.initials: P
authors.lastname: Li
authors.forename: Xiangde
authors.initials: X
authors.lastname: Wang
authors.forename: Neng-Wu
authors.initials: NW
authors.lastname: Zhu
authors.forename: Ping-Xiao
authors.initials: PX
authors.lastname: Wu
authors.forename: Bo
authors.initials: B
authors.lastname: Yang
mesh_terms: D000880:Anthraquinones / Q000737:chemistry*; D003116:Color; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D013464:Sulfuric Acids / Q000737:chemistry*
chemical_list: D000880:Anthraquinones; D013464:Sulfuric Acids; D007501:Iron; C024758:Remazol Brilliant Blue R; C033158:sulfuric acid