电解质对溶液中活性染料聚集的影响

Effects of Electrolytes on the Aggregation of Reactive Dyes in Aqueous Solution

了解电解质改变染料在溶液中分布状态、促进染料分子上染纤维的原理对开发无盐染色技术具有重要意义。通过测试不同电解质对染料溶液紫外可见吸收光谱的影响研究了电解质促进溶液中染料分子聚集原理。研究发现当电解质浓度小于等于1mol/L时,结合水分子数目更多的钾离子促进染料聚集的能力强于钠离子和镁离子,而当电解质浓度为2mol/L时,与水分子结合能力更强的镁离子促进染料聚集的能力强于钾离子和钠离子,说明电解质促进溶液中染料分子聚集的能力强弱与电解质在溶液中与水分子结合的数目及强弱有关,电解质与水分子结合能力越强、结合水分子数目越多促进染料分子聚集的能力越强。

It＇s very important for developing new salt-free dyeing technology that knowing the theory of electrolyte changing the distribution status of dyes and fostering the dye molecules to dye fiber in aqueous solution.The principle of electrolytes promoting the aggregation of dye molecules in aqueous solution was investigated through UV-Vis absorption spectroscopy. When the concentration of electrolytes was less than or equal to 1 mol/L,the ability to promote the aggregation of dye molecules of potassium ions which could combine with eight water molecules was better than that of sodium ions and magnesium ions which could combine with six water molecules;when the concentration of electrolyte was equal to 2 mol/L,the ability to promote the aggregation of dye molecules of magnesium ions which could more stably combine with water molecules was better than that of sodium ions and potassium ions,indicating that the ability to promote the aggregation of dye molecules in solution was related to the number of combined water molecules,the more number of water molecules electrolytes could combine,the stronger the ability to promote the aggregation of dye molecules.