废旧织物制备活性炭对亚甲基蓝的吸附动力学

Adsorption kinetics of waste fabrics based activated carbon to methylene blue

为研究以废旧织物为原料制备活性炭对亚甲基蓝的吸附性能及其吸附机制,以日常生活中废旧棉织物、黄麻织物和棉/亚麻混纺织物为原料,通过氮气将水蒸气送入高温管式炉进行活化制备活性炭材料,工艺条件为:活化温度750℃,活化时间50 min,水蒸气载体流速240 L/h。通过分析活性炭的氮气吸附等温线,并利用BET法计算活性炭的比表面积,用BJH方程表征了活性炭的孔结构,同时重点考察了3种活性炭样品对亚甲基蓝的吸附动力学。结果表明,棉、黄麻和棉/亚麻混纺3种原料活性炭样品的比表面积分别为703.05、719.93、648.25 m2/g,亚甲基蓝饱和吸附量分别为341.49、267.13和242.68 mg/g,而且3种活性炭样品均更符合准二级动力学方程。

In order to study the adsorption properties and adsorption mechanism of waste cellulose based activated carbon to methylene blue,cellulose based activated carbons were prepare from waste cotton,waste jute and waste cotton / flax blended fabrics as raw materials by using steam as activating agent,carrying steam into a high temperature tubular furnace by N2. The preparation process of activation temperature,activation time and N2 flow rate were 750 ℃,50 min and 240 L / h,respectively. The nitrogen gas adsorption-desorption isotherm of waste cellulose based activated carbon was achieved. The specific surface areas and pore size distribution were used to characterize waste cellulose based activated carbon. In addition,the adsorption kinetics of waste cellulose based activated carbon to methylene blue were studied in the experiment. The experimental results show that the waste cellulose based activated carbon is mesoporous material,and the specific surface areas of activated carbon prepared from waste cotton,waste jute and waste cotton / flax（ 50 /50） blend were 703. 05,719. 93 and 648. 25 m2/ g,respectively,and the maximum methylene blue adsorption quantity of activated carbon prepared from waste cotton, waste jute and waste cotton / flax blend were 341. 49, 267. 13 and 242. 68 mg / g,respectively. The adsorption of waste cellulose based activated carbon to methylene blue was in line with second order reaction kinetics.