KOH活化法制备废旧棉织物活性炭及表征

Preparation and Characterization of Activated Carbon from Cotton Woven Waste with Potassium Hydroxide

摘要:

以废旧棉织物为原料，KOH为活化剂，利用化学活化法制备活性炭。采用XRD、SEM、元素分析仪、比表面积及孔径分析仪、FTIR等方法对所制备活性炭的结构与性能进行了分析与表征。结果表明：先炭化废旧棉织物，在m(炭化料)：m(KOH)=1:1，浸渍时间16 h，活化温度850 ℃，活化时间50 min的最佳活化条件下，制备的活性炭比表面积为1368.67 m2/g，其中微孔比表面积占75%，总孔容为0.6208 cm3/g，微孔孔容占总孔容的71.63%，微孔主要分布在0.84~1.3 nm之间；活性炭呈中空纤维状，具有丰富的孔隙结构；碳含量高达90.55%；表面官能团主要为羧基、羰基、羟基等亲水性基团。研究表明，结论：废旧棉织物可作为制备活性炭的原料，所制活性炭性能优良。

Abstract:

Activated carbon was prepared from cotton woven waste with potassium hydroxide. X-ray diffraction (XRD), scanning electron microscopy (SEM), elemental analyzer, FTIR spectroscopy and specific surface area and pore size analyzer were employed to characterize the activated carbon. Firstly, carbonized the cotton woven waste. Then prepared activated carbon at the optimum conditions of the carbon to activated agent ratio of 1:1, immersion time of 16 h, temperature of 850 ℃ and holding time of 50min.The results show that under the optimum conditions, activated carbon has a sophisticated pore structure with specific surface area of 1368.67 m2/g and a total volume of 0.6208 cm3/g. The micropore specific surface area and pore volume account for 75% and 71.63%, respectively. The micropores size were between 0.84~1.3 nm. Activated carbon was hollow fiber with a 90.55% carbon content. The surface functional groups were mainly hydrophilic groups such as carboxyl, carbonyl, hydroxyl and so on. The study shows that the cotton woven waste can be used for the preparation of activated carbon.