Characterization of iron-loaded charcoal using infrared-photoacoustic spectroscopy: Factors governing graphitization
Characterization of iron-loaded charcoal using infrared-photoacoustic spectroscopy: Factors governing graphitization
复制标题
使用红外光声光谱表征载铁木炭：控制石墨化的因素
DOI：
10.1007/s00226-022-01436-4
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发表时间：
2023
期刊：
影响因子：
--
通讯作者：
T. Takayama and S. Yamauchi
中科院分区：
文献类型：
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作者：
T. Yamagishi;Y. Sakai;T. Takayama and S. Yamauchi
采用红外光声（IR-PA）光谱对不同热处理条件下Fe 3+浸渍木材合成的木炭进行表征，以探讨石墨化的影响因素。几个红外波段，由于木材成分中的官能团被用作热解进展的指标。当碳化温度（CT）为1.0 h时，在650 ~ 700 °C范围内红外吸收峰完全消失。由OH伸缩振动引起的红外光谱线的形状表明，铁负载木炭中OH基团与相邻化学物种之间的相互作用比普通木材制成的木炭中的那些更多样化。本文根据红外光谱、拉曼光谱和穆斯堡尔谱分析结果，讨论了浸渍Fe ~（3+）木材热处理过程中的石墨化机理。研究表明，木材成分中的残余官能团和分子骨架阻碍了载铁炭中石墨结构的形成。此外，据证实，还原Fe 3+发生在石墨化之前，在载铁木炭。
Charcoal synthesized from Fe3+-impregnated wood under various heat-treatment conditions was characterized by infrared photoacoustic (IR-PA) spectroscopy to investigate factors governing graphitization. Several IR bands due to functional groups in the wood constituents were used as indicators of pyrolysis progress. The IR bands disappeared completely in the carbonization-temperature (CT) range from 650 to 700 °C when the holding time at CT was set for 1.0 h. The spectral line-shape of IR bands due to O‒H stretching vibrations suggested that the interactions between OH groups and neighboring chemical species in iron-loaded charcoal were more diverse than those in charcoal made from ordinary wood. The graphitization mechanism in the heat treatment of Fe3+-impregnated wood was discussed on the basis of the results obtained from IR-PA measurements, together with Raman and Mössbauer data. This study revealed that the residual functional groups and molecular frameworks originating from wood constituents hinder graphitic structures in iron-loaded charcoal from developing. Moreover, it was confirmed that the reduction of Fe3+occurs prior to graphitization in iron-loaded charcoal.