二次活化活性炭纤维吸附回收二氯甲烷

为了提高活性炭纤维对二氯甲烷气体的吸附回收性能,我们通过二次活化的方法制备出一系列的活化后样品,并表征其基本性质。二次活化样品对二氯甲烷的静态吸附实验表明,800℃活化60 min所得样品的吸附容量最高;之后又采用自制的溶剂回收吸附装置对其进行动态吸附实验,结果显示,在100%含水率条件下,其动态吸附量比原ACF提高了40%。这表明了二次活化能够大幅提升ACF对二氯甲烷的吸附性能。为了探究吸附性能提升的原因,又通过氮吸附的方法对二次活化样品和原样品进行孔径分析,结果显示,800℃活化60 min所得样品的BET比表面积提升了47.1%,对吸附二氯甲烷起主要作用的微孔孔容提高了77.6%。

Secondary activation of activated carbon fiber and its adsorption capability to dichloromethane

In order to improve the adsorption and recovery performance of dichloromethane gas on activated carbon fiber(ACF), a series of samples were prepared by the method of second activation and their basic properties were characterized. Static adsorption experiments show that ACF60 has the highest adsorption capacity for dichloromethane. The performance of dynamic adsorption was valuated by self-made solvent recovery column. The results show that the dynamic adsorption capacity increased by 40%. It indicates that the secondary activation can significantly enhance the activated carbon fiber's performance for the adsorption of dichloromethane gas. In order to explore the reasons of increased adsorption, the products were characterized by nitrogen adsorption. The results show that ACF60's BET specific surface area improved by 47.1% and the micropore volume that plays a major role for adsorption of dichloromethane gas increased by 77.6%.