Degradation of methylene blue by magnetic field and photocatalysis coupling technology
1.School of Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.Yangzhou Vocational
College of Environment and Resources, Yangzhou, Jiangsu 225127, China
Abstract：To solve the persistent color and nondegradable problem of AZO dyestuff effluent, methylene blue with AZO structure was used to simulate wastewater. The degradation of methylene blue by magnetic field and photocatalysis coupling method was investigated. The effects of TiO2 dosage, magnetic density, initial methylene blue concentration, pH value and reaction time were discussed. The results show that magnetic field can improve the degradation effect of methylene blue. Under the conditions with magnetic density of 250 mT, TiO2 dosage of 1 g?L-1, pH value of 11, initial methylene blue concentration of 10 mg?L-1 and reaction time of 90 min, the removal efficiency of COD and the decoloring rate reach 82.76% and 86.02%, respectively. According to the changes of absorption spectra of methylene blue before and after treatment, the AZO bond and the benzene ring are damaged after light-magnetic degradation method, and most of methylene blue is oxidized and decomposed.
2014, Vol. 35 
