title: Catalytic oxidation and spectroscopic analysis of simulated wastewater containing acid chrome blue K by using chlorine dioxide as oxidant.
abstract: An activated carbon-MnO(2) catalyst was prepared by the dipping-calcination method using activated carbon as catalyst support. The catalyst was used for the catalytic oxidation of simulated acid chrome blue K wastewater. The COD removal efficiency and decolor efficiency by catalytic oxidation are 72.0% and 87.8%, respectively, at the condition of wastewater's COD is 2,418 mg/L, the optimum pH value is 1.2, the dosage of chlorine dioxide is 1,200 mg/L, the dosage of activated carbon-MnO(2) catalyst is 4 g by reacting 50 min. The COD removal efficiency by catalytic oxidation is great than that of chemical oxidation. The COD removal efficiency only decreased a little after the catalyst used 8 times. The FTIR spectra indicate that the active ingredient of manganese dioxide is linked with activated carbon by chemical bond, not merely mechanical blending. The intermediates during the degradation process were obtained by using online infrared spectrum analysis. The degradation reaction mechanism of acid chrome blue K by chlorine dioxide oxidation was proposed based upon the experiment evidence.
authors.affiliation: School of Chemistry and Chemical Engineering, South Campus, Shandong University, Jinan 250061, China.
authors.forename: Fengjun
authors.initials: F
authors.lastname: Yu
authors.forename: Laishun
authors.initials: L
authors.lastname: Shi
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D002384:Catalysis; D002606:Charcoal / Q000737:chemistry; D017606:Chlorine Compounds / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D017895:Manganese Compounds / Q000737:chemistry*; D009282:Naphthalenesulfonates / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared; D013997:Time Factors; D014865:Waste Disposal, Fluid; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D001391:Azo Compounds; D017606:Chlorine Compounds; D017895:Manganese Compounds; D009282:Naphthalenesulfonates; D010087:Oxides; D014874:Water Pollutants, Chemical; C508261:acid chrome blue K; D002606:Charcoal; C025109:chlorine dioxide; C016552:manganese dioxide