Effect of alkali metal salt on the macropore structure of rayon-based activated carbon fibers
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摘要: 以黏胶纤维为原料，用碱金属盐和路易斯酸对其进行预处理，经化学活化与水蒸气活化，制得了大孔型活性炭纤维(ACF)。采用扫描电镜（SEM）和BET等温吸附法分别对ACF表面微观结构和材料的吸附性能进行了对比表征,着重研究了碱金属盐浓度与浸渍时间的关联。结果表明：通过控制添加碱金属盐的浓度和浸渍时间，可以控制活性炭纤维表面的孔径大小及其分布，制备出表面既富含大孔（孔径>50nm）也有丰富微孔(孔径<2nm)的新型复合孔型ACF，该材料具有较高的比表面积Abstract: Macroporous Rayon-based activated carbon fibers (ACFs) were produced from Rayon precursors impregnated with alkali metal salt and Lewis acid followed by chemical activation or water vapor activation. The effect of pretreatment conditions such as the concentration of alkali metal salt and impregnation time on the properties of the resultant ACFs were investigated by scanning electron microscopy and physical adsorption. Results showed that the pore sizes and their distribution could be controlled by the concentration and impregnation time of the alkali metal salt. A novel ACF with abundant macropores and micropores and with high specific surface area was obtained by an optimum pretreatment with alkali metal salt.
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Key words:
- Rayon-based activated carbon fibers /
- Activation /
- Macropore /
- Specific surface area
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