废弃粉末活性炭热解再生实验及表征分析

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。

Experimental and characteristic analysis on pyrolysis regeneration of waste powdered activated carbon

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:N₂ as 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.