Surface characterization of chitosan and cellulose-derived porous carbons with K2CO3 activation and its application to water and ethene adsorption
Surface characterization of chitosan and cellulose-derived porous carbons with K2CO3 activation and its application to water and ethene adsorption
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DOI：
10.1007/s10934-021-01116-x
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发表时间：
2021-07
影响因子：
2.6
通讯作者：
N. Miyajima;Kazuki Takizawa;H. Sakane
中科院分区：
文献类型：
--
作者：
N. Miyajima;Kazuki Takizawa;H. Sakane
以多糖、纤维素和壳聚糖为原料，利用K2CO3活化法制备多孔炭，研制出一种可用于果蔬长途运输保鲜的吸附剂。用容积式吸附装置和Boehm滴定方法研究了它们对水、乙烯和二氧化碳的吸附行为和孔性能(即孔表面积、体积和表面官能团)。用气相色谱测定了室温下碳吸附乙烯的时间过程。壳聚糖炭不仅含有含氧官能团，而且还含有氮官能团，使碳表面与水分子的亲和力高于纤维素碳。这些官能团在900℃时显著分解，并形成了氮气吸附测量无法检测到的细孔。K2CO3的活化提供了比二氧化碳更适合乙烯吸附的超微孔。所提供的碳表明，与商业上可获得的乙烯吸附剂相比，乙烯的脱除率很高。
Porous carbons were prepared by the K2CO3activation of polysaccharides, cellulose and chitosan, to develop an adsorbent that can be used to keep fruits and vegetables fresh during long-distance transportations. Their water, ethene, and carbon dioxide adsorption behaviors and pore properties (i.e., pore surface area and volume and surface functional groups) were investigated using a volumetric adsorption apparatus and Boehm titration method. The time courses of ethene adsorption by the carbons at room temperature were measured through gas chromatography. Chitosan-derived carbons did not have only oxygen-containing functional groups but also nitrogen-containing ones that provided the carbon surface with a higher affinity to water molecules than cellulose-derived carbons. These functional groups significantly decomposed at 900 °C and developed fine pores that were not detectable by nitrogen adsorption measurement. The K2CO3activation provided ultramicropores suitable for ethene adsorption than carbon dioxide one to the carbons. The presented carbons indicated a high ethene-removal rate comparable to that of commercially available ethene adsorbent.