高锰酸钾活化法制备红麻秆芯活性炭及其表征

以低浸渍比的KMnO4为活化剂高效活化红麻秆芯,制备了大比表面积和微孔结构发达的活性炭.探讨了活化温度、活化剂与原料的浸渍比、活化时间对活性炭的碘和亚甲基蓝吸附性能的影响.结果表明,低成本和高性能红麻秆芯活性炭的较佳制备条件为:浸渍比2%、活化温度800℃和活化时间120 min;该条件下活性炭的BET比表面积、总孔容、平均孔径分别为985.36 m2.g-1、0.54 cm3.g-1和1.09 nm.通过氮气吸附—脱附等温线、FT-IR、FE-SEM、EDX等手段对红麻秆芯活性炭的孔结构特征、表面官能团、显微形貌和元素组成进行了表征.结果显示,KMnO4活化法有望成为一种低成本、高效和环境友好的活性炭制备方法.

Preparation and characterization of activated carbon from kenaf core by potassium permanganate activation

Potassium permanganate was used as a new effective chemical activator for production of activated carbon from kenaf core,with large specific surface area and highly developed microporous structure.The effects of activation temperature,impregnation ratio and activation time on the iodine and methylene blue adsorption capacities of kenaf core derived activated carbon were evaluated to optimize the activation process.Pore characteristics,surface functional groups,micro-morphology and element content were investigated with N2 adsorption-desorption isotherms,FT-IR,FE-SEM and EDX analysis,respectively.The results showed that utilization of KMnO4 as an activating agent,at a rather low impregnation ratio,could be expected as a low-cost,efficient and green approach for manufacture of activated carbons.