不同铁盐的光解对水溶性染料溶液的脱色研究

STUDY ON DISCOLOURATION OF WATER-SOLUBLE DYES IN AQUEOUS SOLUTION INDUCED BY THE PHOTOLYSIS OF DIFFERENT Fe(Ⅲ) SALTS

本文研究了四种不同铁盐［Ｆｅ（ＣｌＯ４）３、Ｆｅ（ＮＯ３）３、ＦｅＣｌ３和Ｆｅ２（ＳＯ４）３］在紫外光照射下的光解对水溶性染料溶液的脱色作用。在ｐＨ＝３的混合溶液中，不同阴离子铁盐对染料溶液光化学脱色速率的大小顺序的一般规律为ＮＯ－３＞Ｃｌ－≈ＣｌＯ－４＞ＳＯ２－４。对ＮＯ－３自身光解对水溶性染料溶液的脱色作用作了进一步研究。

The effect of inorganic anion on photochemical discoloration of five dyes, C. I. reactive red 2, C. I. reactive blue 4, C. I. reactive black 8, C. I. basic red 13 and C. I. basic yellow 2, were studied in a UV light /Fe(Ⅲ)-hydroxy complex system. Different inorganic anion coexisting with Fe3+ resulted in different photochemical discoloration rates of the dyes in the aqueous solutions at pH 3.0. The general rule is NO-3 >Cl-≈ClO-4>SO2-4. The effect of NO-3 which also has an photoactivity was investigated specially in detail.