以杉木为原料制备木质基活性微球炭,考察了微球前驱体的热稳定性、化学结构及活性微球炭的孔结构参数等性能的变化。热重分析表明:随着固化温度的升高,微球前驱体热失重最大反应速率峰温逐渐向高温方向偏移;红外光谱分析表明:固化过程中脱水缩合反应形成的交联结构增强了前驱体的热稳定性;比表面积和孔隙度分析表明:活性微球炭具有典型的微孔结构和不规则的中孔结构,比表面积随着固化温度的升高而先增大后减小。固化温度75℃时的活性微球炭的比表面积最大为1502m2/g,微孔孔容和中孔孔容分别为0.488cm3/g和0.261cm3/g。
The wood-based activated carbon microspheres were prepared from Chinese fir.The thermal stability,chemical structure of precursors and the pore structure parameters of activated carbon microspheres were investigated.The results showed that as the curing temperature raised,the peak temperature of maximum reaction rate was gradually shifted to higher temperature.FT-IR analysis showed that the crosslinking structure from dehydration condensation reactions enhanced the thermal stability of precursors.The BET analysis showed that the activated carbon microspheres had a typical microporous structure and irregular mesoporous structure,and the specific surface area was first increased and then decreased as the curing temperature increased.When the curing temperature was 75℃,the maximum specific surface area value was 1502m2/g,the micropore and mesopore pore volumes were 0.488cm3/g and 0.261cm3/g,respectively.
[1] 沈曾民,张文辉,张学军,等.活性炭材料的制备与应用[M].北京:化学工业出版社,2008,127-131.
[2] Alcantara R,Lavela,P,Ortiz G F,et al.Carbon microspheres obtained from resorcinol-formaldehyde as high-capacity electrodes for sodium-ion batteries[J].Electrochemical and Solid State Letters,2005,8(4):222-225.
[3] 徐保明,张弘,唐强,等.木质素基碳纤维制备方法的研究进展[J].化工新型材料,2018,46(4):23-26.
[4] Huang Y X,Ma E N,Zhao G J.Thermal and structure analysis on reaction mechanisms during the preparation of activated carbon fibers by KOH activation from liquefied wood-based fibers[J].Industrial Crops and Products,2015,69:447-455.
[5] 刘春玲,郭全贵,史景利,等.酚醛纤维交联程度对炭纤维结构和性能的影响[J].材料研究学报,2006,20(3):245-249.
[6] 尹江苹,赵广杰.固化处理对木材液化物碳纤维原丝的微观构造及热稳定性影响[J].复合材料学报,2013,30(2):50-55.
[7] 马晓军,刘辛燕.基于FT-IR的木质碳纤维原丝固化增强机理的研究[J].林产化学与工业,2012,32(5):19-23.
[8] 杨骏兵,凌立成,刘朗.固化和炭化条件对酚醛树脂基球形活性炭机械强度与吸附性能的影响[J].炭素技术,1999,27(4):10-14.
[9] Okada K,Yamamoto N,Kameshima Y,et al.Porous properties of activated carbons from waste newspaper prepared by chemical and physical activation[J].Journal of Colloid and Interface Science,2003,262:179-193.
[10] Azargohar R,Dalai A K.Steam and KOH activation of biochar:experimental and modeling studies[J].Microporous and Mesoporous Materials,2008,110(2-3):413-421.
[11] Lastoskie C,Gubbins K E,Quirke N.Pore size distribution analysis of microporous carbon:a density functional theory approach[J].Journal of Physical Chemistry,1993,97(18):4786-4796.
[12] 金彦任,黄振兴.吸附与孔径分布[M].北京:国防工业出版社,2015,87-105.
基金资助
中央高校基本科研业务费(2017PT11);北京林业大学大学生创新创业训练计划(X201810022096)
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