%A YU Feng-jun, SHI Lai-shun* %T Manganese  dioxide  catalytic  oxidation with  chlorine  dioxide  as  an  oxidant  of  simulated  wastewater  containing  acid chrome blue K %0 Journal Article %D 2010 %J Journal of Shandong University(Engineering Science) %R %P 88-94 %V 40 %N 2 %U {http://gxbwk.njournal.sdu.edu.cn/CN/abstract/article_831.shtml} %8 2010-04-16 %X

 The activated carbon-MnO2 catalyst was prepared by the dipping method with activated carbon as the carrier. The catalyst was used for catalyzing/degrading simulated acid chrome blue K wastewater with chlorine dioxide as the  oxidant. The COD removal efficiency and decolor efficiency by catalytic oxidation were 72.0% and 87.8%, respectively, when the condition of wastewater’s COD was 2418mg/L, the optimum pH value was 1.2, and the dosage of chlorine dioxide was 1200mg/L,  and the dosage of activated carbon-MnO2 catalyst was 4g after  reacting 50min. The COD removal efficiency by catalytic oxidation was increased by 42.6% compared with that of the chemical oxidation. The COD removal efficiency decreased only 10.5% after the catalyst was used  8 times. The IR spectra indicated that the active ingredient of manganese dioxide was linked with activated carbon by a chemical bond, not merely by mechanical blending. The benzene ring and naphthalin ring in the acid chrome blue K were degraded into quinone and carboxylic acid, and finally changed into carbon dioxide and water during  chemical oxidation or catalytic oxidation as shown by on-line infrared spectrum mechanism analysis.