氯化铁活化热解制备棉纺品废料基活性炭的优化

Optimization of Preparation for Cotton-Textile-Waste-Based Activated Carbon by Pyrolysis with Ferric Chloride as Activating Agent

以棉纺品废料为原材料,采用氯化铁为活化剂热解制备活性炭,基于响应曲面法考察质量比(氯化铁:棉纺品废料)、活化时间及活化温度及对活性炭得率及碘吸附值的影响。在质量比为1.7:1、活化时间为67 mim、活化温度为700℃的最优化制备工艺条件下,活性炭的得率和碘吸附值分别为36.02%和735.71 mg/g。SEM和BET的结果表明,活性炭表面孔道丰富,比表面积、总孔体积及平均孔径分别为800.23 m^2/g、0.46 cm^3以及2.32 nm。对Cr(VI)的吸附过程符合Langmuir吸附等温模型,为单层吸附,最大吸附量为204.08 mg/g,吸附性能优异。

Cotton textile wastes were used as raw material to prepare activated carbon by pyrolysis,with ferric chloride as the activating agent. Effects of mass ratio （ ferric chloride：cotton textile waste）,activation time and temperature on yield and iodine adsorptive value of the activated carbon were studied by response surface methodology. Under the optimized condition where mass ratio was 1.7：1 ,activation time was 67 min and activation temperature was 700 ℃,yield and iodine adsorptive value of the optimal activated carbon sample were 36.02 % and 735.71 mg/g, respectively. Further analysis of SEM and BET illustrated that specific surface area, total pore volume and average pore diameter of the optimal sample were 800.23 m^2/g , 0.46 cm^3 and 2.32 nm, respectively. The adsorption process of Cr（ VI ） was conformed to Langmuir adsorption isotherm model,which was monolayer adsorption. The prepared activated carbon had excellent adsorption performance with the maximum adsorption capacity of 204.08mg/g.