高铁酸盐对活性及分散染料的脱色研究

采用湿法制备了高铁酸钾(K₂FeO₄)氧化剂，研究了其对染料活性艳红X-3B(X-3B) 和分散蓝2BLN(2BLN)在不同pH条件下的脱色效果，并对Al₂ (SO₄)₃、K₂FeO₄及O₃对活性及分散染料的脱色效果进行了比较。结果表明：高铁酸钾对活性及分散染料的脱色效果明显， X-3B脱色率随pH的增加不断提高，2BLN脱色率在pH 6～10范围内无明显变化，在pH＝5时达到最大值。在X-3B及2BLN浓度同为100 mg／L，pH分别为10、5， K₂FeO₄浓度分别为100 mg／L和200 mg／L时，BLN及X-3B的脱色率分别达到92.3％和87.3％。在相同条件下，K₂FeO₄对活性艳红X-3B的脱色效果好于Al₂(SO₄)₃和O₃； 而K₂FeO₄对分散蓝2BLN的脱色效果虽比Al₂ (SO₄)₃稍差，但比臭氧的脱色效果要好。同时还研究了K₂FeO₄对活性及分散染料的脱色机理，结果表明： 高铁酸钾对X-3B的脱色依赖于K₂FeO₄的氧化作用，而对的2BLN的脱色则以絮凝为主。

Study on decolorization of reactive and disperse dyes by ferrate

Potassium ferrate(K2FeO4) oxidant was prepared by wet method.Decolorization of reactive dye(reactive brilliant red,X-3B) and disperse dye(disperse blue,2BLN) by ferrate at different pH was studied.The results showed that potassium ferrate had obvious effect on the decolorization of reactive and disperse dyes.The decolorization rate of X-3B increased with pH increasing.The decolorization rate of 2BLN had no significant changes during pH changed from 6 to 10,but it reached the maximum value at pH 5.Under the conditions of the concentration of dyes both 100 mg/L,pH 10,5 and K2FeO4=100 mg/L and 200 mg/L,respectively,2BLN and X-3B decolorization rates reached to 92.3% and 87.3%.Under the same conditions,the decolorization of reactive red X-3B by ferrate was much better than that by Al2(SO4) 3 and O3.The decolorization of disperse blue 2BLN by ferrate was a little less effective than that by Al2(SO4) 3,but it was much better than that by O3.The decolorization mechanisms of 2BLN and X-3B by ferrate were also studied.The results showed that the decolorization of X-3B was almost dependent on the oxidation of K2FeO4.But the decolorization of 2BLN was mainly dependent on the flocculation of K2FeO4.