麻秆炭/PET功能纤维对甲醛吸附行为的研究

Study on adsorption behavior of hemp charcoal/PET functional fiber on formaldehyde

本论文通过紫外分光光度计来研究麻秆炭/PET功能纤维对甲醛的吸附行为。首先,研究了不同炭含量、时间、温度下纤维对甲醛吸附性能的影响规律。结果表明甲醛吸附量随着纤维炭含量的增加呈增长趋势;吸附初期,吸附速率较快,随着时间的增加,吸附速率变慢但吸附量仍在增加,最后吸附达到饱和;吸附量在不同温度范围内出现不同吸附特征。然后,用吸附等温线模型来研究纤维的吸附热力学。结果表明吸附曲线更符合Langmuir模型,吸附是个自发的放热过程,只与纤维的活性位点以及界面相互作用相关,属于物理吸附。最后,用吸附动力学模型来研究3%炭含量纤维的吸附动力学。结果表明在Tg以下,吸附主要受内扩散影响,在Tg以上,吸附主要受表面吸附影响。

In this paper,the adsorption behaviors of formaldehyde on hemp charcoal/PET functional fiber were studied by UV spectrophotometer.Firstly,the effects of functional fibers on formaldehyde adsorption performance under different carbon content,time and temperature conditions were studied.The results showed that the formaldehyde adsorption amount of fiber increased with the increase of carbon content in the fiber.At the initial stage of adsorption,the adsorption rate of formaldehyde was faster.With the increase of time,the adsorption rate became slower but the adsorption amount was still increasing.Finally it reached adsorption saturation.The adsorption capacity of formaldehyde had different adsorption characteristics in different temperature ranges.Then two adsorption isotherm models were used to study the adsorption thermodynamics of functional fibers.The results showed that the adsorption curve was more consistent with the Langmuir model.The adsorption of formaldehyde was a spontaneous exothermic process.The adsorption was only related to the active sites and interface interactions of the fibers,which was a physical adsorption.Finally,the functional fibers with a carbon content of3%were selected,and three adsorption kinetic models were used to study the adsorption kinetics of functional fibers.The results showed that under T g,the adsorption of formaldehyde was mainly affected by internal diffusion.Above T g,the adsorption of formaldehyde was mainly affected by surface adsorption.