废弃粉末活性炭热解再生实验及表征分析

摘要

通过对废弃粉末活性炭(WPAC)进行热解再生实验,采用热重(TG)、红外分析(FTIR)、表面分析(BET)、X 射线衍射(XRD)表征手段,分析了废弃粉末活性炭热解再生前后的比表面积、孔隙结构及再生过程中有机物分解的初步规律.同时比较了废弃粉末活性炭再生前后对亚甲基蓝(MB)的吸附性能,对WPAC热解再生效果进行了评价.实验得出的最佳热解再生条件是以氮气为载气,热解温度650℃,热解时间2h.在此再生条件下,再生炭(RPAC)的比表面积为1161.4m2/g,恢复到新鲜活性炭的94.5%;废弃粉末活性炭再生前后对亚甲基蓝的吸附等温线符合Langmuir模型,吸附容量为420.5mg/g,恢复到新鲜炭的89.6%.由此结果表明,WPAC经热解再生后表面化学性质、孔隙结构及吸附性能均得到有效恢复.%The effect of pyrolysis regeneration on the specific surface area,pore structure and the decomposition of organic matter of waste powdered activated carbon(WPAC)was studied through X-ray diffraction(XRD),Fourier transform infrared analysis(FTIR),BET and thermo-gravimetric analysis(TG). Meanwhile,the adsorption capacity of waste powdered activated carbon were analyzed before and after pyrolysis. The optimal pyrolysis conditions as follow:N2as carrier gas,the regeneration temperature and the time of pyrolysis is 650℃ and 2h respectively. Under this condition, BET surface area of RPAC could be recovered to 1161.4m2/g which was 94.5% of fresh activated carbon. Langmuir model could well describe the adsorption isotherm of methylene Blue. The adsorption capacity of RPAC for the methylene blue was 420.5mg/g which was 89.6% of fresh activated carbon. The results showed that the surface chemical property,pore structure of WPAC and adsorption capacity could be effectively recovered through pyrolysis.