TCEP对栀子黄在羊毛上的染色动力学和热力学影响研究

Study on the effect of TCEP for Gardenia Yellow on wool dyeing kinetics and thermodynamics

在模拟无限染浴条件下,测定天然染料栀子黄在羊毛上的上染速率曲线及吸附等温线,计算并探讨热力学及动力学参数的变化,研究了具有高效选择性的精细还原剂TCEP对栀子黄上染羊毛的染色热力学及动力学性能的影响.染色动力学研究发现:TCEP能显著提升染料栀子黄的上染速率及上染率;明显提升栀子黄上染羊毛时的扩散系数;降低了染料的扩散活化能,有效减弱染料在纤维内部扩散的能阻.染色热力学研究表明:栀子黄上的吸附等温线符合Freundlich型,属于非定位物理吸附;TCEP的加入提升了染色亲和力;使得染色热绝对值增大,促使染料和纤维之间形成更多的分子间作用力;栀子黄染色熵为负值,TCEP影响染料在纤维上的分布状态.

The thermodynamic and kinetic parameters change of Gardenia Yel ow dye for wool were cal-culated and discussed through the dyeing rate curve and the adsorption isotherms measurement under the simulated infinite dye bath condition. The effect of reductant TCEP with high efficient selectivity on the dyeing thermodynamics and dynamic performance of Gardenia Yel ow dye for wool was studied. The dynamic study results showed that TCEP could significantly improve the dyeing and dye uptake rate, significantly improve the diffusion coefficient of Gardenia Yel ow dye on wool, reduce the dye diffusion activation energy, and effective-ly reduce the energy resistance of the dye diffusing inside the fiber. The thermodynamic study results indicat-ed that Gardenia Yel ow accorded with Freundlich adsorption isotherm model, belonged to non- locating physi-cal adsorption; the addition of TCEP could enhance the dyeing affinity and increase the dyeing heat absolute, and promote forming more intermolecular forces between the dyes and fibers; the dyeing entropy of Gardenia Yel ow was negative, TCEP could significantly influence the distribution of the dye in the fibers.