title: Applying sequential injection analysis (SIA) and response surface methodology for optimization of Fenton-based processes.
abstract: This work presents the use of sequential injection analysis (SIA) and the response surface methodology as a tool for optimization of Fenton-based processes. Alizarin red S dye (C.I. 58005) was used as a model compound for the anthraquinones family, whose pigments have a large use in coatings industry. The following factors were considered: [H(2)O(2)]:[Alizarin] and [H(2)O(2)]:[FeSO(4)] ratios and pH. The SIA system was designed to add reagents to the reactor and to perform on-line sampling of the reaction medium, sending the samples to a flow-through spectrophotometer for monitoring the color reduction of the dye. The proposed system fed the statistical program with degradation data for fast construction of response surface plots. After optimization, 99.7% of the dye was degraded and the TOC content was reduced to 35% of the original value. Low reagents consumption and high sampling throughput were the remarkable features of the SIA system.
authors.affiliation: Instituto de Química, Universidade de São Paulo, São Paulo, Brazil.
authors.forename: Allan C V
authors.initials: AC
authors.lastname: dos Santos
authors.forename: Jorge C
authors.initials: JC
authors.lastname: Masini
mesh_terms: D002138:Calibration; D017022:Flow Injection Analysis / Q000295:instrumentation* / Q000379:methods*; D006861:Hydrogen Peroxide / Q000032:analysis* / Q000737:chemistry*; D007501:Iron / Q000032:analysis* / Q000737:chemistry*; D013499:Surface Properties
chemical_list: C045076:Fenton's reagent; D006861:Hydrogen Peroxide; D007501:Iron