活性橙13溶液的染料聚集行为

Aggregation behavior of Reactive Orange 13 in aqueous solution

以活性橙13为研究对象,采用UV/Vis分光光度法探讨染料浓度、介质温度、pH值及电解质对染液可见光吸收性能的影响,并测定了相应条件下染料颗粒的粒径,据此推测染料在不同状态下聚集状态的变化。研究表明,高浓度条件下,随染液浓度的提高,染液的λmax发生红移,并伴随染料颗粒粒径增大,表明染料分子逐渐形成不同的聚集体;升高介质温度或pH值时,染液的λmax呈蓝移现象,染料颗粒直径呈减小趋势,表明升温或提高pH值可使聚集体解聚;电解质的加入则会加剧高浓度染液的聚集,不同金属离子(K+,Na+,Li+)因金属离子半径不同,对染液聚集的影响程度为K+>Na+>Li+。

The visible light absorptivity of Reactive Orange 13 is investigated with different dye concentration,temperature,pH value and electrolytes,and then the aggregation status of dyes is inferred from particle size. The results show that a large bathochromic shift of λmaxand the increase of particle size are induced under high dye concentration,which indicated that different dye aggregates are formed gradually. With the rise of temperature and pH value,the λmaxof dye solution shows a hypsochromic shift and the particle size decreases,which indicated the rise of temperature and pH value will contribute to the significantly disaggregation of dye aggregates. A great aggregation of dyes will occur with the addition of electrolyte,while different ions with different ionic radius have different effect on aggregation with the sequence of K^＋ Na^＋ Li^＋.