活性炭纤维吸附含溴甲烷气体的性能

Adsorption performance of CH_3Br-containing gas on activated carbon fiber

采用动态吸附法在25℃下,测定了3种活性炭纤维(ACF-1、ACF-2和ACF-3)对含溴甲烷气体的吸附性能和回收效果,并对活性炭纤维的孔结构进行表征。探讨了孔结构、溴甲烷浓度、气体流量、循环使用次数等因素对活性炭纤维吸附溴甲烷性能的影响。结果表明,活性炭纤维比表面积大小及0.4～0.8 nm左右的微孔数量决定了其对溴甲烷吸附性能的优劣;气体中溴甲烷的浓度的提高使活性炭纤维对溴甲烷的穿透和饱和吸附量增加,而气体流量的增加则使活性炭纤维对溴甲烷的穿透和饱和吸附量降低,但两者均使穿透和饱和吸附时间缩短;活性炭纤维多次循环使用后,对溴甲烷的吸附容量明显地降低,循环12次后达到稳定吸附,其稳定吸附值为133.5 mg/g。

The adsorption and recovery performances of CH3Br from the waste gas containing CH3Br vapor on the activated carbon fiber were studied by dynamic adsorption method.The effects of pore structure of ACF,CH3Br concentration in waste gas,gas flow and adsorption cycle times of ACF on the breakthrough and saturation adsorption quantity of CH3Br were investigated.The results show that the adsorption performances of CH3Br on ACF depend on the specific surface area and the amount of micropore with the size of 0.4～0.8 nm.As the increase of CH3Br concentration in waste gas,the breakthrough and saturated adsorption quantities of CH3Br on ACF were enhanced.And the rise of gas flow resulted in the opposite results.But both shorten the breakthrough and saturated adsorption time of CH3Br on ACF.With the increase of cycle times,the adsorption capacity of CH3Br on ACF reduces obviously.The adsorption capacity of CH3Br reaches the stable adsorption value of 133.5 mg/g when ACF are recycled up to 12 times.