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首页> 外文期刊>ACS Sustainable Chemistry & Engineering >Effects of Cellulose, Hemicellulose, and Lignin on the Structure and Morphology of Porous Carbons
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Effects of Cellulose, Hemicellulose, and Lignin on the Structure and Morphology of Porous Carbons

机译：纤维素，半纤维素和木质素对多孔碳结构和形态的影响

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摘要

Porous carbon materials stemming from biomass have drawn increasing interest because of their sustainable properties. Cellulose, hemicellulose, and lignin are the three basic components of crude biomass, and were investigated to reveal their influence on the derived carbonaceous materials. Huge amounts of oxygen-containing functional groups in cellulose and hemicellulose tend to be eliminated as H2O, CO2, and CO and give micropores during pyrolysis, whereas lignin contains plentiful aromatic units which are chemically inert, and thus produce nonporous carbon materials. When the KHCO3 was introduced during the pyrolysis process, the plentiful hydroxyl in cellulose and hemicellulose underwent dehydration condensation among different parent polymers, which are responsible for the formation of macroporous structure. By contrast, The β-O-4 bands in lignin experience homolysis and give rise to benzene-containing units, which finally result in carbon nanosheets. Furthermore, we demonstrated the mixture of cellulose, hemicellulose, and lignin can display a three-dimensional porous structure (containing macropores, mesopores, and micropores) when less than 50% of lignin is contained.
机译：来自生物质的多孔碳材料由于其可持续的特性而引起了越来越多的关注。纤维素，半纤维素和木质素是粗生物质的三个基本成分，并进行了研究以揭示它们对衍生的含碳物质的影响。纤维素和半纤维素中的大量含氧官能团往往会以H2O，CO2和CO的形式被消除，并在热解过程中产生微孔，而木质素含有大量的化学惰性的芳族单元，因此会产生无孔碳材料。当在热解过程中引入KHCO3时，纤维素和半纤维素中的大量羟基在不同的母体聚合物之间进行了脱水缩合，这是大孔结构形成的原因。相比之下，木质素中的β-O-4谱带经历均解并生成含苯单元，最终形成碳纳米片。此外，我们证明了当纤维素，半纤维素和木质素的混合物中木质素含量少于50％时，它可以显示三维多孔结构（包含大孔，中孔和微孔）。

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