Treatment of dye wastewater by base catalysis of peroxymonosulfate (PMS)
ZHAI Jun, LIU Pei-song, ZHAO Ju-jiao
1. Key Laboratory of the Three Gorges Reservoir Region's Eco-Environment, College of Environment and Ecology, Chongqing University, Chongqing 400045, China
Three typical dyes, methylene blue, acid orange 7, and rhodamine B were treated by base catalysis of PMS in this study to investigate the optimal degradation conditions and the mechanism. Under the optimal condition (pH=10.8~11.5(methylene blue) or pH=10.0~10.8(acid orange 7 or rhodamine B), PMS dosage=100mg/L), the decolorization rate constants of methylene blue, acid orange 7 and rhodamine B were 0.097, 0.074, and 0.004min-1, respectively, and the decolorization efficiency were 95.1%, 93.3%, and 30.1%, respectively. The scavenging tests indicated that singlet oxygen played a critical role in the treatment by PMS/base for all of the three dyes. Based on the results of UV-Vis spectra analysis, it could be speculated that the faster decolorization rates of methylene blue and acid orange 7 could be due to the more efficient oxidation of the thiazide chromophore group and the azo bond by singlet oxygen.
翟俊, 柳沛松, 赵聚姣. 过一硫酸盐碱催化处理染料废水[J]. 中国环境科学, 2020, 40(2): 647-652.
ZHAI Jun, LIU Pei-song, ZHAO Ju-jiao. Treatment of dye wastewater by base catalysis of peroxymonosulfate (PMS). CHINA ENVIRONMENTAL SCIENCECE, 2020, 40(2): 647-652.
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