氢氧化钾活化烟杆制造活性炭及表征

Production and characterization of activated carbon from tobacco stems by potassium hydroxide activation

以烟杆为原料,氢氧化钾为活化剂,采用一步炭化法制备了活性炭。采用正交实验研究了对活性炭得率和吸附性能的影响的主要因素,得到了最佳工艺条件,所制活性炭碘吸附值为1198.27 mg/g,亚甲基蓝吸附值为国家一级品标准的3倍。还测定了该活性炭的氮吸附等温线,通过H-K方程和密度函数理论表征了活性炭的孔结构,其结果与电子探针和透射电镜分析的活性炭微观结构相一致。

A series of activated carbons were prepared from tobacco stems as raw materials and potassium hydroxide as activating agent by a one-step carbonization process. The effects of the preparation variables on the yield and adsorption properties of activated carbon were systematically studied via orthogonal experiments, and the optimum condition was obtained. The iodine value of the activated carbon prepared under the optimum condition was 1198.27mg/g and the methylene blue adsorption was 3 times of that the first grade product specified in the National Standard. Furthermore, the nitrogen isotherm of the sample was determined. The porous structures were investigated with the Horvath-Kawazoe equations and density function theory. The results of the pore structures analysis was consistent with scanning electron microscopy （SEM） and transmission electron microscopy （TEM） study.