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以糠醛渣为原料、KOH为活化剂,采用两步活化法制备了活性炭。考察了活化温度、活化时间、碱炭比和浸渍时间对活性炭孔结构及吸附性能的影响。采用低温N2吸附、BET、BJH及DFT理论对活性炭孔结构进行了表征分析,利用傅里叶变换红外-拉曼光谱仪检测其表面官能团,分别使用扫描电镜和X射线衍射对其进行表观形貌观察和晶型分析。结果表明,制备活性炭的最佳工艺条件为:活化温度800℃、活化时间3h、碱炭比3∶1、浸渍时间12h。所制备的糠醛渣活性炭的吸附孔径分布集中,吸附孔容为0.8825cm2/g,DFT总比表面积为3290.5m2/g,其碘吸附值和亚甲基蓝吸附值分别为2107.32mg/g和39.67mL/0.1g。
Using furfural residue as raw material and KOH as activator, activated carbon was prepared by two-step activation method. The effects of activation temperature, activation time, ratio of alkaline to carbon and impregnation time on the pore structure and adsorption properties of activated carbon were investigated. The pore structure of activated carbon was characterized by low temperature N2 adsorption, BET, BJH and DFT theory. The surface functional groups were detected by Fourier transform infrared spectroscopy (Raman spectroscopy), and the morphology was characterized by scanning electron microscopy and X-ray diffraction Observation and Crystallographic Analysis. The results showed that the optimum conditions for the preparation of activated carbon were activation temperature 800 ℃, activation time 3h, ratio of alkaline to carbon 3:1, impregnation time 12h. The adsorption pore size distribution of the furfural residue activated carbon prepared was concentrated, the adsorption pore volume was 0.8825cm2 / g and the total specific surface area was 3290.5m2 / g. The iodine adsorption and methylene blue adsorption were 2107.32mg / g and 39.67mL / 0.1, respectively g.