以兰炭粉为原料,水蒸汽为活化剂,采用物理活化法制备中孔活性炭.分别讨论了活化温度、活化时间、水蒸汽质量流量对活性炭碘吸附值的影响,并采用正交实验对工艺条件进行了优化.利用全自动物理吸附仪对活性炭的比表面积和孔结构进行表征.结果表明:随着活化温度的升高、活化时间的延长和水蒸汽流量的增大,活性炭的碘吸附值均呈现先升高后下降的变化规律.正交实验结果表明,水蒸汽活化兰炭粉的适宜条件为:活化温度900℃,活化时间60 min,水蒸汽流量1.25 g/min.此条件下制得的活性炭具有多级孔的特征,而且以中孔为主,其碘吸附值为924.45 mg/g,比表面积为818.52 m2/g.
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