羧甲基纤维素水热炭化-CO_2活化制备微米球形活性炭  

Preparation of Micron-size Spherical Activated Carbon from Carboxymethyl Cellulose via Combination of Hydrothermal Carbonization and Carbon Dioxide Activation Method

作　　者：代林林[1] 李伟[1] 吴琼[1] 赵鑫[1] 刘守新[1] 

机构地区：[1]东北林业大学材料科学与工程学院,黑龙江哈尔滨150040

出　　处：《林产化学与工业》2015年第4期21-27,共7页Chemistry and Industry of Forest Products

基　　金：'十二五'国家科技支撑计划资助(2012BAD32B04);国家自然科学基金资助项目(31170545);中央高校基本科研业务费专项资金资助(2572014EB01)

摘　　要：以羧甲基纤维素(CMC)为原料,通过水热炭化-CO2活化制备微米级球形活性炭。研究了水热炭化温度、时间和CMC用量对前驱体炭球的形貌、粒径和分散性的影响,分析了活化温度、时间对球形活性炭形貌和孔结构的影响。通过扫描电子显微镜(SEM)、红外光谱(FT-IR)和光电子能谱(XPS)对前驱体炭球的形貌、表面官能团进行了表征分析,并用低温液氮吸附分析了球形活性炭的孔径结构。结果表明,前驱体炭球的含氧官能团以—COOR和—OH为主,在温度为200℃,CMC用量为1.5 g,40 mL H2O,反应时间为10 h,可成功制备出形貌规则,粒径均一,分散性良好的微米级炭球。前驱体炭球经在850℃下经CO2活化2 h可制备出球形结构完整的微米级球形活性炭,比表面积高达1 005.85 m2/g,平均孔径为2.78 nm。Micron-size spherical activated carbon （SAC） was prepared via hydrothermal carbonization-CO2 activation using carboxymethyl cellulose（CMC） as starting materials. The effects of reaction parameters including carbonization temperature, reaction time, CMC dose, activation temperature, and activation time on the morphology and porous structure of spherical carbon （SC） were evaluated. Scanning electron microscopy （SEM）, Fourier transform diffuse reflectance infrared spectroscopy （FT-IR）, X-ray photoelectron spectroscopy （XPS）, and N2 （77K） adsorption-desorption isotherm were used for characterization of the synthesized products. The results indicated that the carbon sphere precursor, which mainly containing oxygenated functional groups of--COOR and --OH, were changed after hydrothermal carbonization. Regular carbon spheres with uniform sizes and good dispersity were prepared under the optimum conditions（ 200℃, 10 h, 1.5 g CMC, and 40 mL H2O）. After the activation of carbon sphere precursor under CO2 atmosphere at 850℃ for 2h, micron-size spherical activated carbon with surface area of 1 005.85 m^2/g and average pore diameter of 2.78 nm was obtained.

关 键 词：羧甲基纤维素 水热炭化 微米级 球形 活性炭 

分 类 号：TQ35[化学工程]