木棉基活性炭纤维的制备及其对挥发性有机物的吸附性能

以木棉纤维为原料，采用NaOH、ZnCl2化学活化法在450℃处理后制备得到木棉基活性炭纤维样品。利用扫描电镜、X射线衍射分析、拉曼光谱及低温氮气吸脱附对木棉基活性炭纤维的结构进行了表征和测定，结果表明：所制备的木棉基活性炭纤维由无定形碳组成，具有丰富的微孔结构，比表面积达到1397 m2/g。将通过上述方法获得的木棉基活性炭纤维在30 ℃条件下对低沸点二氯甲烷及常见挥发性有机物(VOCs)中苯、甲苯进行吸附性能评价，由吸附穿透曲线计算获得这3种VOCs的吸附量分别为130 mg/g、350 mg/g、479 mg/g。进一步考察了木棉基活性炭纤维的再生性能及在不同温度下对二氯甲烷吸附穿透曲线的影响，发现随着吸附温度升高，穿透时间提前，吸附容量随之下降；在温度为20 ℃时，木棉基活性炭纤维对二氯甲烷的吸附量可达179 mg/g。

Preparation and volatile organic compound adsorption properties of Kapok-based activated carbon fiber

Kapok-derived activated carbon fibers (Kapok-450) have been prepared by an NaOH and ZnCl2 activation method. Scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy and N-2 adsorption-desorption methods were used to characterize the structure of the resulting material. The results showed that Kapok-450 was composed of amorphous carbon with an abundance of micropores and the specific surface area can reach 1397 m2/g. The adsorption behavior of Kapok-450 with dichloromethane, benzene and toluene at 30 ℃ was also evaluated. The results obtained on the basis of the adsorption breakthrough curves showed that the adsorption capacities were 130 mg/g, 350 mg/g and 479 mg/g respectively. Furthermore, the regenerability and the influence of adsorption temperature on dichloromethane adsorption breakthrough curves with Kapok-450 were examined.The adsorption capacity of dichloromethane was found to increase with the decrease of adsorption temperature and reached 179 mg/g at 20 ℃.