title: Monitoring of decolorization kinetics of Reactive Brilliant Blue X-BR by online spectrophotometric method in Fenton oxidation process.
abstract: Online spectrophotometry method is employed to monitor simulated Reactive Brilliant Blue X-BR (RBB X-BR) in aqueous solution in Fenton oxidation process. The effects of initial dosage of FeSO(4) and H(2)O(2), pH value, initial concentration of dye and temperature have been studied. The results show that online spectrophotometric method is a quick, feasible and convenient technique to monitor color removal of RBB X-BR in Fenton process. The optimal dosage of H(2)O(2) and pH is 3.529 mM and 3, respectively. The optimal dosage of Fe(2+) for color removal is 0.1618 mM. The concentration of initial FeSO(4) against the reaction rate constant (k(ap)) for decolorizing is linear correlation as: k(ap)=0.1354[Fe(2+)](o) (R(2)>0.99). The apparent activation energies of reaction is 25.21 kJ mol(-1) (R(2)>0.99). The intrinsic reaction rate constant of OH with RBB X-BR in aqueous solution is 7.396 x 10(10)M(-1)s(-1). The molecule structure of RBB X-BR is decomposed and not mineralized by Fenton's reagent. The main intermediate products are 1,2-diacetylenzene and 2,5-diritrobenzoic acid. The probable mechanism of the decoloration of RBB X-BR is also discussed.
authors.affiliation: School of Science, Beijing Institute of Technology, Beijing 100081, China.
authors.forename: Hang
authors.initials: H
authors.lastname: Xu
authors.forename: Dongxiang
authors.initials: D
authors.lastname: Zhang
authors.forename: Wenguo
authors.initials: W
authors.lastname: Xu
mesh_terms: D003116:Color; D004396:Coloring Agents / Q000737:chemistry*; D005240:Feasibility Studies; D008401:Gas Chromatography-Mass Spectrometry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D010084:Oxidation-Reduction; D013056:Spectrophotometry, Ultraviolet
chemical_list: D004396:Coloring Agents