Research on degradation of methylene blue-containing wastewater by Fe2+ activated persulfate
LIU Xiao-jia1, ZHANG Xiao-wei1, WU Zhuang-zhuang1, WANG Xiao-hui1, HAI Re-ti1, LI Jing2
1. Department of Environment Science and Technology, Beijing University of Chemical Technology, Beijing 100029, China; 2. Hebei Shenghong Environmental Protection Technology Co., Ltd., Chengde 067000, China
Abstract: In this study,Fe2+ activated sodium persulfate (SPS) is used in the degradation of methylene blue (MB).Influences of the initial solution pH,Fe2+ concentration,SPS concentration,Fe2+/SPS ratio and initial MB concentration on the degradation of MB and COD in the solution are studied.Results show that the degradation rate of MB in the acidic condition is higher than that in the alkaline condition.The removal efficiency of MB achieves the best at pH=3.Too high or too low concentrations of Fe2+ and/or SPS will have certain impact on the degradation of MB and the optimal dosing ratio is C(Fe2+):C(S2O32-)=1:2.The optimal dosing concentrations of SPS and Fe2+ are 0.4 mmol·L-1 and 0.2 mmol·L-1 respectively when the initial MB concentration is 50 mg·L-1.MB decoloration by Fe2+/SPS system can reach 80%-90%.The intermediates in oxidation can get a salinity of 20% to 40% through Fe2+/SPS system.When the temperature of the solution is below 20℃,there appears molecular focus phenomenon in MB solution.With the increase of initial temperature in the solution,the de-coloring rate of MB will increase.The optimum reaction temperature for decoloration of MB molecules is 40℃.Analysis by means of liquid chromatography-mass spectrometry (LC-MS),the oxidative intermediates of MB mainly include diamino phenol,2-aminophenol,benzothiazole,phenol and other benzene homologues.
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