Abstract

Gas adsorption properties of key natural fibres were investigated through monitoring the adsorption process of ammonia onto wool and cotton by time-resolved infrared spectroscopy. It was found that Langmuir isotherm model best described ammonia adsorption onto wool and cotton, indicating monolayer adsorption. The adsorption capacity of wool and cotton for ammonia was found to be 7.948 × 10⁻⁵mol g⁻¹ and 3.066 × 10⁻⁵mol g⁻¹, respectively. Adsorption diffusion was found to be the rate limiting step for wool in the initial adsorption stage, following the Dumwald–Wagner model. For cotton, adsorption reaction process was found to be the rate limiting step for the whole adsorption, following the pseudo-second-order model. The activation energy values of ammonia adsorption were calculated to be 26.50 kJ mol⁻¹ for wool and 30.43 kJ mol⁻¹ for cotton, which demonstrates that ammonia adsorption onto fibres requires energy. The study could promote developing textile products for odour control.

摘要

通过时间分辨红外光谱监测氨对羊毛和棉花的吸附过程，研究了关键天然纤维的气体吸附性能。发现朗缪尔等温线模型最能描述氨吸附在羊毛和棉花上，表明单层吸附。羊毛和棉花对氨的吸附容量分别为7.948 × 10 ^-5 mol g ^-1和3.066 × 10 ^-5 mol g ^-1。在 Dumwald 之后，吸附扩散被发现是羊毛在初始吸附阶段的限速步骤-瓦格纳模型。对于棉花，发现吸附反应过程是整个吸附的限速步骤，遵循伪二级模型。经计算，羊毛吸附氨的活化能值为 26.50 kJ mol ^-1，棉为 30.43 kJ mol ^-1，这表明氨吸附到纤维上需要能量。该研究可以促进开发用于控制气味的纺织产品。