零电荷点
生物炭
木屑
微型多孔材料
吸附
滴定法
活性炭
化学
扫描电子显微镜
核化学
元素分析
解吸
比表面积
化学工程
材料科学
无机化学
热解
有机化学
复合材料
工程类
催化作用
作者
Katarzyna Jedynak,B. Charmas
标识
DOI:10.1007/s10450-023-00399-7
摘要
Abstract In this study four kinds of biochars were prepared from the KOH modified biomass. As the carbon precursors there was used the sawdust from the following trees: oak, hornbeam, apple and cherry. The physicochemical properties of the materials were characterized by the N 2 adsorption, scanning electron microscopy, thermal analysis (TG, DTG and DTA), infrared spectroscopy, and the Boehm’s titration method. Moreover, pH pzc (the point of zero charge) was determined. The adsorption capacity and the temperature-programmed desorption of ammonia were also studied. The obtained activated biochars were characterized by the large specific surface area (672 to 912 m 2 /g) and the total pore volume (0.30 to 0.4 cm 3 /g) as well as the well-developed microporous structure (85–97%). These observations were also confirmed by the SEM analysis. The maximum NH 3 adsorption capacity of the activated biochar was determined to be 3.05 mmol/g. These results prove that the sawdust of various origins is appropriate to prepare a cost-effective, environmentally friendly biochar.
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