Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima, 2-1 Minamijosanjima, Tokushima 770-8506, Japan.
Bioresour Technol. 2010 Jun;101(11):3964-9. doi: 10.1016/j.biortech.2010.01.032. Epub 2010 Feb 4.
Activated carbons were prepared from bamboo by chemical activation with K2CO3 or physical activation with CO2. The structural and surface chemical characteristics of the activated carbons were determined by N2 adsorption-desorption and Boehm titration, respectively. The water vapor adsorption properties of the activated carbons with various pore structures (preparation conditions) were examined. The relationship between water vapor adsorption capacity and pore properties, and the humidity control capacity of the prepared activated carbons are also discussed. The water adsorption isotherms show a region of rapidly increasing uptake of water vapor, and the relative humidity corresponding to those regions was different according to the preparation conditions, especially activation temperature. Water vapor adsorption capacity was improved with larger pore volume and surface area, but the humidity control capacity in a certain specific humidity region differed greatly according to the relative humidity corresponding to the steeply rising regions of the isotherms. In the typical operating conditions of an adsorption heat pump, RH 10-35%, the bamboo-sourced activated carbon that was prepared at 873K by potassium carbonate activation with impregnation ratio 1.0 had the highest humidity control capacity.
活性炭由竹子通过 K2CO3 化学活化或 CO2 物理活化制备而成。通过 N2 吸附-解吸和 Boehm 滴定分别确定了活性炭的结构和表面化学特性。研究了具有不同孔结构（制备条件）的活性炭的水蒸气吸附性能。还讨论了水蒸气吸附容量与孔特性之间的关系以及所制备活性炭的湿度控制能力。水蒸气吸附等温线显示出水蒸气吸收迅速增加的区域，并且与制备条件（特别是活化温度）相对应的区域的相对湿度不同。水蒸气吸附容量随较大的孔体积和表面积而提高，但是在一定的特定湿度区域内的湿度控制能力根据等温线急剧上升区域所对应的相对湿度而有很大差异。在吸附热泵的典型工作条件下，RH 10-35%，通过浸渍比 1.0 用碳酸钾在 873K 下制备的竹基活性炭具有最高的湿度控制能力。
