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Preparation and water vapor adsorption of “green” walnut-shell activated carbon by CO2 physical activation
Adsorption Science & Technology ( IF 2.9 ) Pub Date : 2020-01-22 , DOI: 10.1177/0263617419900849
Hong Zhao 1 , Qiongfen Yu 1 , Ming Li 1 , Shengnan Sun 1
Affiliation  

In this study, activated carbons without any chemical residue were prepared from walnut shells. The preparation method in a tube furnace included a pyrolysis carbonization process and a CO2 activation process. The influences of activation temperature and holding time on the specific surface area, yield, and pore structure were investigated. Adsorption performance of water vapor was also examined in details. Thermogravimetric analysis, N2 adsorption–desorption isotherm, and scanning electron microscope were used to characterize samples. The result shows that the activation energy at different heating rates varies from 30.16 to 64.86 kJ/mol. The highest water vapor adsorption capacity of the sample is 0.3824 g/g and it takes only 30 min to realize regeneration. And the maximum Brunauer–Emmett–Teller specific surface area of 1228 m2/g also occurs in this optimal preparation condition. CO2 physical activation method was found to have a positive effect on pore structure development of activated carbon for water vapor adsorption.

中文翻译:

CO2物理活化制备“绿色”核桃壳活性炭及其水蒸气吸附

在这项研究中,没有任何化学残留物的活性炭是由核桃壳制成的。管式炉制备方法包括热解碳化过程和CO2活化过程。考察了活化温度和保温时间对比表面积、产率和孔结构的影响。还详细研究了水蒸气的吸附性能。热重分析、N2 吸附-解吸等温线和扫描电子显微镜用于表征样品。结果表明,不同升温速率下的活化能在30.16~64.86 kJ/mol之间变化。样品的最高水蒸气吸附量为0.3824 g/g,再生仅需30 min。1228 m2/g 的最大 Brunauer-Emmett-Teller 比表面积也出现在该最佳制备条件下。研究发现,CO2物理活化方法对吸附水蒸气的活性炭的孔隙结构发展有积极影响。
更新日期:2020-01-22
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