铁屑法脱色效率与染料结构的关系

33种水溶性染料溶液的铁屑法脱色试验结果表明,所有染料在10min内脱色率达到55%以上,其中33%的染料脱色率超过90%,61%的染料脱色率超过80%.初步探讨了染料结构与其铁屑法脱色效率之间的定性关系.结果表明,铁屑法脱色效率与染料结构之间有较密切关系,染料共轭链的长短、染料分子空间位阻的大小、是否有互变异构现象、偶氮双键中的氮原子是否与临近基团形成氢键以及取代基的电负性大小等对脱色效果有影响.

Relationship between dye structure and decolorization efficiency of iron chip technique

The experiment results of decolorization of 33 kinds of soluble dye solution using iron chip technique indicated that the decolorization efficiency of all dyes reached over 55% in 10 minutes; the decolorization efficiency of which 33% and 61% over 90% and 80% respectively. The qualitative relationship between dye structure and decolorization efficiency was explored preliminarily. The relationship was quite close; the length of dye conjugated chain, degree of dye molecular spatial position hindrance, existence of mutual change isomerization, existence of hydrogen bond formation of nitrogen atom in the azo double bond with near group, and the level of negative electricity of substitutive radical could influence the decolorization.