Abstract

In the present study, the dyeing of Poly(trimethylene terephthalate) (PTT) were performed using disperse Blue 79 dye in the presence and absence of ultrasound waves. In this work, the effect of some important parameters such as particle size, pH and effect of ultrasonic time on dye durability and adsorption behavior of disperse Blue 79 dye were evaluated. Under ultrasonic irradiation, the optimization conditions were achieved by PTT amount (0.1 g), irradiation time (15 min), contact time (120 min) at temperature (80 °C), pH = 6. The results showed that the ultrasonic time 15 min was chosen as an optimal time for nano-dye solution fabrication. Our results reveal that in pH higher than 6, the disperse dyes was degraded and the negative effect of alkaline environment on the adsorbent hydrolysis was specified. The achieved thermodynamics parameters values and the adsorption isotherms from the experiment suggests that the adsorption kinetics of the disperse Blue 79 dye on PTT is in accordance with a pseudo second-order kinetic model. The some important isotherms including Freundlich, Nernst, Temkin and Langmuir equations were used to determine the adsorption isotherm and results show that the Nernst isotherm has a good correlation coefficient. Thermodynamic evaluation showed that Gibbs free energy was found to be negative, indicating that the process is spontaneous. In addition, the positive value of enthalpy, signifying that the process is endothermic, and the negative entropy, indicating less activity in the interface. The particle size of disperse Blue 79 dye in the presence of ultrasound waves is smaller than those in the absence of ultrasound waves. Due to the polyester nature of the adsorbent, the adsorption was performed through diffusion mechanism between the fibers, and by diffusion increasing the adsorption is improved.

摘要

在本研究中，聚对苯二甲酸丙二醇酯 (PTT) 的染色是在超声波存在和不存在的情况下使用分散蓝 79 染料进行的。在这项工作中，评估了一些重要参数，如粒径、pH 值和超声波时间对染料耐久性和分散蓝 79 染料吸附行为的影响。在超声辐照下，优化条件为PTT用量（0.1 g）、辐照时间（15 min）、接触时间（120 min）、温度（80℃）、pH=6。结果表明超声时间为15 min 被选为纳米染料溶液制造的最佳时间。我们的结果表明，在高于 6 的 pH 值下，分散染料降解，并且碱性环境对吸附剂水解的负面影响是明确的。从实验获得的热力学参数值和吸附等温线表明分散蓝 79 染料在 PTT 上的吸附动力学符合伪二级动力学模型。一些重要的等温线包括Freundlich、Nernst、Temkin 和Langmuir 方程被用来确定吸附等温线，结果表明Nernst 等温线具有良好的相关系数。热力学评估表明，发现吉布斯自由能为负，表明该过程是自发的。此外，焓为正值，表示该过程是吸热的，熵为负值，表示界面中的活动较少。有超声波时分散蓝 79 染料的粒径小于无超声波时的粒径。