李立清　刘飒　梁鑫　刘峥

摘要：采用微波高温烧结炉分别在600 ℃，700 ℃和800 ℃下对商业活性炭进行改性，利用比表面积及孔径分析仪、Boehm滴定、傅立叶变换红外光谱比较分析活性炭的比表面积和孔结构、表面官能团等物化性质.以1，2二氯乙烷为吸附质进行固定床吸附实验.研究表明：改性后活性炭表面酸性基团减少，碱性基团随温度升高增多；比表面积、孔容减小，微孔比表面积增加；活性炭对1，2二氯乙烷的吸附量排序为：AC800 > AC700 > AC600 > AC0；灰色关联度分析结果表明：改性活性炭的物理结构特性对吸附量的影响大于表面基团；DR模型和动力学模型拟合结果都表明活性炭对1，2二氯乙烷的吸附主要为物理吸附.

关键词：微波改性；活性炭；吸附；1，2二氯乙烷；灰色关联

中图分类号：O613.71 文献标识码：A

Abstract：Activated carbon （AC） was modified with microwave irradiation heating at 600， 700 and 800 °C respectively. The physicochemical properties of the activated carbon were characterized by using Boehm titration， Fourier transformed infrared spectroscopy and Specific surface area and pore size analyzer. Fixedbed adsorption experiments were conducted by using 1，2dichloroethane as the adsorbate. The results show that， after microwave modification， the surface acidic functional groups of activated carbon decrease and the surface basic functional groups increase with the increase of temperature. The specific surface area and total pore volume of activated carbon decrease， while the micropore specific surface area increases. The order of the adsorption capacity for 1，2dichloroethane is AC800 > AC700 > AC600 > AC0.The results of the grey relativity analysis show that the physical properties of the modified activated carbon have a larger effect on the adsorption capacity than the surface functional groups. The fitting results of DR model and kinetics equation illustrate that it is a physical adsorption process for activated carbon.

Key words：microwave modification； activated carbon； adsorption； 1，2dichloroethane； grey relativity analysis

1，2二氯乙烷主要用于有机合成、金属清洗、塑料粘接等领域，常温下极易挥发同时具有刺激性，人类长期接触会引起急慢性中毒[1].活性炭因孔隙结构丰富，比表面积巨大的特点，成为优良的吸附剂[2-3].

微波加热在整个物体内同时进行，温度均匀且梯度小，相对于传统加热方式具有快速、便宜、高效特点[4].近年来微波加热被用于改变活性炭物化性质，以提高其吸附能力.杨斌武等[5]采用微波改性活性炭进行脱硫实验，发现改性后活性炭比表面积未发生明显地变化，总孔容略有减小，表面碱性基团数量和N元素含量明显增加.Liu Qingsong等[6]研究了微波改性活性炭对水溶液中亚甲基蓝的吸附，发现改性后活性炭的酸……