以造纸黑液中提取的酸不溶木质素（AIL）为原料，K₂CO₃/尿素为活化剂，制备了多级孔结构的超高比表面积活性炭（SSAC），并对其进行了结构表征，研究了SSAC对亚甲基蓝（MB）溶液的吸附性能。结果表明，木质素原炭（LC）呈质地致密、表面光滑的碎片状，仅存在孔径分布集中在0.66 nm的微孔结构。SSAC则显示出孔洞丰富的3D泡沫状类珊瑚礁形态，为孔径分布集中于0.69~1.71 nm和3.09~48.6 nm的微-介孔共存的结构，且介孔数量随活化温度的提高而增加。其中，SSAC-900具有最大的比表面积（2 969.97 m²/g）和孔容积（2.018 cm³/g），可以有效快速地吸附MB阳离子染料。吸附等温线实验表明，Langmuir吸附等温线更适用于拟合SSAC对MB的吸附过程；吸附动力学分析显示，SSAC对MB的吸附行为符合准二级动力学模型。

Super-high specific surface area activated carbon (SSAC) is prepared via one-step process through using K₂CO₃/urea as activator,and acid insoluble lignin (AIL) from black liquor of papermaking as precursor.N₂ adsorption-desorption instrument (Autosorb-iQ) and scanning electron microscopy (SEM) are used to characterize the morphology of prepared SSAC samples.The adsorption capacity of the samples to methylene blue cationic dye is studied by using DU800 spectrophotometer.It is indicated that a majority of tight structure of fragment with smooth surface are found in lignin carbon (LC),while SSAC shows 3D foam like coral reef with rich pores.LC has merely microporous structure with a pore size distribution concentrated at 0.66 nm,and SSAC has both a large number of micropores and abundant mesopores,with pore size distribution concentrated in the ranges of 0.69-1.71 nm and 3.09-48.6 nm,respectively.The number of mesopores in SSAC will rise with the increasing activation temperature.SSAC-900 exhibits the highest specific surface area (2 969.97 m²·g^-1) and the largest pore volume (2.018 cm³·g^-1),which shows a great potential as efficient adsorbent for removal of methylene blue cationic dye.Two kinds of isotherm models and two kinds of kinetic models are selected to simulate the adsorption process.It is found through experimental data that Langmuir isotherm model is the best fitting model for methylene blue adsorption by SSAC.Adsorption kinetic analysis display that the adsorption behavior of SSAC to methylene blue accords with the quasi second order kinetic model.

冼学权(1987-),男,硕士,助理研究员,研究方向为天然高分子材料与技术,xianxq@gxas.cn