CO_2活化法制备玉米芯基活性碳及其吸附性能
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摘要
以可再生生物质玉米芯为原料,CO_2为活化剂,制得玉米芯基活性碳(ACs)。通过改变活化温度,进一步研究了ACs的孔隙结构对吸附性能的影响。结果表明:当活化温度为900℃时,ACs可获得最大的比表面积(1 427 m2/g),总孔容(0. 866 cm3/g)及发达的微孔结构,且ACs对亚甲基蓝的吸附有最大值;而当活化温度为800℃时,ACs具有最高的CO_2吸附值且极微孔含量丰富。ACs对CO_2的吸附能力主要取决于其极微孔含量,而与比表面积没有太大关系。
In this work,activated carbons(ACs) were successfully prepared by carbonization and CO_2 activation,with corncob as carbon precursor. The influence of the pore structure on the adsorption performance of corncob-based activated carbons was further studied by changing the activation temperature. The results showed that AC-900 show the maximum specific surface area(1 427 m2/g),total pore volume(0. 866 cm3/g),and developed micropore structure when the activation temperature of 900 ℃ . Moreover,AC-900 has the maximum adsorption of methylene blue. The prepared ACs had the highest CO_2 adsorption capacity and the most abundant ultra-micropore structure when the activation temperature was 800 ℃ . The CO_2 adsorption capacity of ACs has strong correlation of the ultra-micropore content,but no connection with the specific surface area.
In this work,activated carbons(ACs) were successfully prepared by carbonization and CO_2 activation,with corncob as carbon precursor. The influence of the pore structure on the adsorption performance of corncob-based activated carbons was further studied by changing the activation temperature. The results showed that AC-900 show the maximum specific surface area(1 427 m2/g),total pore volume(0. 866 cm3/g),and developed micropore structure when the activation temperature of 900 ℃ . Moreover,AC-900 has the maximum adsorption of methylene blue. The prepared ACs had the highest CO_2 adsorption capacity and the most abundant ultra-micropore structure when the activation temperature was 800 ℃ . The CO_2 adsorption capacity of ACs has strong correlation of the ultra-micropore content,but no connection with the specific surface area.
引文
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[3] Vann K L,Thi T T L. Activated carbon derived from rice husk by Na OH activation and its application in supercapacitor[J]. Progress in Natural Science:Materials International,2014,24(3):191-198.
[4]张长新，陈阵．我国玉米贸易发展趋势与应对策略[J]．经济纵横，2009(4):68-70.
[5] Oktyabrskiy V P. A new opinion of the greenhouse effect[J]. St Petersburg Polytechnical University Journal Physics and Mathematics,2016,2(2):124-126.
[6] Meng L Y,Park S J. Mg O-templated porous carbons-based CO2,adsorbents produced by KOH activation[J]. Materials Chemistry and Physics,2012,137(1):91-96.
[7]金香梅，郭剑，孟龙月，等．伊利石模板法制备玉米芯基多孔碳吸附剂[J]．广州化工，2016,44(19):89-91.
[8] Jia S P,Wang Y H,Xin G X,et al. An efficient preparation of Ndoped mesoporous carbon derived from milk powder for supercapacitors and fuel cells[J]. Electrochimica Acta,2016(5):196-210.
[9] Tucker P C,Lita A,Latturner S E,et al. Reaction of methane with bulk intermetallics containing iron clusters yields carbon nanotubes[J]. Chemistry of Materials,2013,25(9):1480-1482.
[10]黄大成，邹亚娟，金承钰，等．ZnCl2活化-稀酸高压蒸煮制备高比表面积秸秆活性炭[J]．实验室研究与探索，2015,34(6):31-33+154.
[11]王晨迪，金香梅，孟龙月，等．玉米芯/壳聚糖基多孔碳材料的制备及其气体吸附性能研究[J]．材料导报，2016,30(S2):436-439.
[12] Bagheri N,Abedi J. Adsorption of methane on corn cobs based activated carbon[J]. Chemical Engineering Research and Design,2011,89(10):2038-2043.
[13] Meng L Y,Park S J. Effect of Zn Cl2,activation on CO2,adsorption of N-doped nanoporous carbons from polypyrrole[J]. Journal of Solid State Chemistry,2014,218:90-94.
[14]朴海燕，孟龙月，韩顺玉，等．Zn Cl2活化制备N掺杂多孔碳材料及其CO2吸附性能研究[J]．材料导报，2015,29(S1):310-312.
[15] Meng L Y,Meng W,Chen T,et al. CO2adsorption capacity of activated N-doping porous carbons prepared from graphite nanofibers/polypyrrole[J]. Journal of Applied Polymer Science,2014,131(15),40517.
[16] Zhang Z,Zhou J,Xing W,et al. Critical role of small micropores in high CO2uptake[J]. Physical Chemistry Chemical Physics,2013,15(7):2523-9.
[17] Wickramaratne N P,Jaroniec M. Activated carbon spheres for CO2adsorption[J]. ACS Applied Materials and Interfaces,2013,5(5):1849-55.
[18]张双，刘芳，李佳蔓，等．氮改性介孔碳的制备及其对水中壬基酚聚氧乙烯醚的吸附[J]．石油学报(石油加工)，2017,33(3):471-479.
[19]索路路，李生娟，李应涛，等．三维全碳多孔结构对亚甲基蓝吸附性能的动力学探究[J]．高等学校化学学报，2016,37(11):2043-2049.
[20]李善评，方洪琛，李冲，等．聚丙烯腈基活性炭纤维对自来水中总铝的去除[J]．实验室研究与探索，2011,30(2):12-15.
[21]徐子颉，朱梅，甘礼华．活性炭吸附能力的测定[J]．实验室研究与探索，1996(4):74-75.
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