ABSTRACT

Kapok fiber as a natural sorbent with excellent hydrophobic-oleophilic characteristic was studied. The effect of temperature on oil sorption behavior and wettability of kapok fiber powder was quantitatively evaluated by capillary rise method. Results showed that at the packing density of 0.1 g/cm³, the oil sorption capacity of kapok fiber powder presented only about 5% difference when the temperature ranged from 20°C to 90°C, with the values to engine oil, mineral oil, and PAO4 ranging from 10.96 to10.42 g/g, 10.73 to 10.18 g/g, and 10.25 to 9.89 g/g, respectively. However, the sorption coefficient which related to the sorption rate increased almost exponentially with the increasing of temperature. Then, the oil wettability of kapok fiber powder was further investigated from the perspective of contact angle. Nearly logarithmic increment in contact angle between the fiber powder and test oil was observed when higher temperature condition was applied, indicating that the enhancement of temperature apparently weaken the wettability of oil to solid powder. The adhesion work between fiber powder and oil was evaluated based on Young–Dupré equation, which suggested that higher temperature lead to lower adhesion work. Outcomes from this research are believed to provide importance reference for the usage of kapok fiber as sorbent when different temperatures are applied.

摘要

研究了木棉纤维作为具有优异的疏水亲油特性的天然吸附剂。用毛细管上升法定量评价了温度对木棉纤维粉的吸油性能和润湿性的影响。结果表明，在0.1 g / cm ³的堆积密度下，当温度在20°C至90°C范围内时，木棉纤维粉的吸油量仅相差5％，其中机油，矿物油和PAO4的值在10.96至10.42 g / g之间，分别为10.73至10.18 g / g和10.25至9.89 g / g。但是，与吸附速率有关的吸附系数几乎随温度的升高呈指数增长。然后，从接触角的角度进一步研究了木棉纤维粉的油润湿性。当施加较高温度条件时，观察到纤维粉末与试验油之间的接触角几乎对数增加，这表明温度的升高明显削弱了油对固体粉末的润湿性。基于Young-Dupré方程评估了纤维粉与油之间的粘附作用，这表明较高的温度导致较低的粘附作用。据信，当施加不同的温度时，该研究的结果为使用木棉纤维作为吸附剂提供了重要的参考。