高锰酸钾去除水中染料色度的研究

Study of Dye Wastewater Decolorization by Potassium Permanganate

研究了高锰酸钾对几种较典型染料的脱色效果,考察了初始pH值和高锰酸钾投加量对脱色效果的影响。结果表明:在强酸性条件下,高锰酸钾的脱色效果最佳,但对大部分实验染料,pH≤11时,仍有良好脱色效果;增加反应时间和高锰酸钾投量也对脱色效果有一定改善;罗丹明B脱色前后的紫外可见吸收曲线表明,在强酸性条件下,高锰酸钾能较好地降低紫外和可见光范围内的特征吸收,中性和碱性条件下,紫外末端吸收有所增加。初步表明高锰酸钾可能无法将该染料彻底无机化。

Color removal efficiency on several dyes by potassium permanganate was investigated. The influence of several factors, i.e. initial pH value and dose of potassium permanganate on color removal efficiency is discussed. The result indicates that strong acid condition may do good to color removal. For most dyes in the experiment, permanganate has obvious effect on color removal when pH<11. The color removal efficiency increase when reaction time and dose of potassium permanganate increase. The UV-Vis spectra of Rhodamine B show that potassium permanganate can significantly decrease the absorbency under strong acid solution. But the terminal absorbency increases at neutral or basic solution. It indicates that potassium permanganate can not fully mineralize this dye.