K_2CO_3活化法制备棉纤基活性炭及孔结构分析

Preparation and pore structure analysis of cotton fiber based activated carbon with K_2CO_3

以废旧棉纺织品为原材料,K_2CO_3为活化剂,采用化学活化法制备棉纤基活性炭。选取活化温度、浸渍比、浸渍时间和活化时间为影响因子,探讨不同因素对活性炭碘吸附值和得率的影响,通过分析在不同条件下活性炭的比表面积及孔结构,确定棉纤基活性炭的最佳制备条件。结果表明:K_2CO_3活化法制备棉纤基活性炭的最佳条件为活化温度850℃、浸渍比1∶1、浸渍时间24 h、活化时间2 h;在该条件下,活性炭样品比表面积为1 697.38 m2/g,碘吸附值为1 637.47 mg/g,得率为14.15%;样品的中孔和微孔孔容分别为0.56 cm3/g和0.61 cm3/g。废旧棉织物可以制备出性能优良的活性炭,K_2CO_3活化法在优化棉纤基活性炭的制备工艺中是可行的。

Cotton fiber based activated carbon was prepared from waste cotton by chemical activation with K2CO3 . The activation temperature, impregnation ratio, impregnation time and activation time were selected as influencing factors. The influences of specific surface area and pore structure of activated carbon under different conditions were discussed. By analyzing the iodine adsorption value and yield of activated carbon under different conditions, the optimum prepration conditions for preparing cotton fiber based activated carbon were determined. The results show that the optimum preparation conditions of cotton fiber based activated carbon are activation temperature of 850 ℃, impregnation ratio of 1 ∶ 1, immersion time for 24 h and activation time for 2 h. Under these conditions, the activated carbon sample has the maximum specific surface area of 1 697.38 m^2 /g, the iodine adsorption value of 1 637.47 mg/g and the yield of 14.15%. The pore volume of the mesoporous is 0.56 cm^3 /g and the microporous is 0.61 cm^3 /g. The study shows that the waste cotton can be used as raw material to produce excellent performance activated carbon. And it is feasible to use K2CO3 activation method to optimize the preparation process of cotton fiber based activated carbon.