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通过水蒸气活化法制备了聚苯乙烯基球形活性炭,并研究了其对二苯并噻吩(DBT)的吸附性能。采用扫描电镜(SEM)、N2吸附、热重分析(TG)以及液相吸附试验考察了球形活性炭的结构特征。结果表明:以苯乙烯离子交换树脂为原料,通过水蒸气活化法,可以得到比表面积979m2/g～1672m2/g的球形活性炭。其中,BET比表面积和孔容随活化时间和水蒸气流量的增加而增大,而孔径小于0.7nm的窄微孔却减小。球形活性炭对DBT的吸附量可达109.36mg/g,吸附量与比表面积和总孔容关系不大,而与小于0.7nm的窄微孔成正比。球形活性炭在对DBT的吸附过程中存在不可逆吸附。球形活性炭所含窄微孔的孔容越大,脱附所需要的温度越高,不可逆吸附量越大。
Polystyrene-based spherical activated carbon was prepared by water vapor activation method and its adsorption on dibenzothiophene (DBT) was studied. The structural characteristics of spherical activated carbon were investigated by scanning electron microscopy (SEM), N2 adsorption, thermogravimetric analysis (TG) and liquid phase adsorption experiments. The results showed that spherical activated carbon with specific surface area of 979m2 / g ~ 1672m2 / g could be obtained by the steam activation method using styrene ion exchange resin as raw material. Among them, the BET specific surface area and pore volume increase with the increase of activation time and water vapor flow, while the narrow micropores with pore size less than 0.7nm decrease. The adsorption capacity of spherical activated carbon to DBT is up to 109.36mg / g, the adsorption capacity has little to do with the specific surface area and total pore volume, but is proportional to the narrow pore size less than 0.7nm. Spherical activated carbon adsorption of DBT in the presence of irreversible adsorption. The larger the pore volume of the narrow micropores contained in the spherical activated carbon, the higher the temperature required for the desorption, the larger the irreversible adsorption amount.