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通过湿法造纸技术制备了微纤包覆活性炭复合材料,研究了甲苯和对二甲苯在基于微纤复合材料结构化固定床上的吸附透过行为.结果表明,颗粒活性炭被很好地包覆在烧结锁定的三维网络中,活性炭包覆前后的比表面积分别为976和955 m2/g,微孔体积分别为0.261和0.247 cm3/g;甲苯和对二甲苯在单一颗粒碳固定床和结构化固定床上的吸附均展示出竞争吸附特性,在两床层中均是甲苯先透过.在5%透过浓度下,甲苯和对二甲苯在结构化固定床上的透过时间较在颗粒碳固定床上分别延长了20和30 min,甲苯和对二甲苯分离时间增加了10 min.采用Yoon–Nelson模型对透过曲线进行拟合,相关系数R2>0.98,甲苯和对二甲苯在结构化固定床上的吸附速率常数分别为颗粒碳固定床的3和1.6倍.
Microfiber-coated activated carbon composites were prepared by wet papermaking technology and the adsorption and permeation behavior of toluene and para-xylene on the structured fixed bed based on microfibrous composites was studied. The results showed that the granular activated carbon was well coated In the three-dimensional network, the specific surface area of activated carbon before and after coating was 976 and 955 m2 / g, respectively. The volume of micropores was 0.261 and 0.247 cm3 / g, respectively. Toluene and p- The adsorption on the bed exhibited competing adsorption characteristics, with the first permeation of toluene in both beds. At 5% permeation, the permeation of toluene and para-xylene onto the structured fixed bed was faster than on the granular carbon fixed bed Respectively, and the separation time of toluene and p-xylene increased by 10 min respectively.The fitting curve was fitted by Yoon-Nelson model with the correlation coefficient R2> 0.98, and the toluene and paraxylene on the structured fixed bed The adsorption rate constants are 3 and 1.6 times that of granular carbon fixed bed, respectively.