以毛竹废料为原料采用磷酸活化法制备活性炭,为了考察磷酸活化工艺过程对活性炭孔结构的影响,实验将毛竹在炭化前后分别采用磷酸浸渍并活化,根据77K氮气吸附等温线对产品结构进行了表征。实验结果表明:磷酸浸渍毛竹活化过程所得产品不仅具有较高比表面积(1485~2127m^2·g^-1)且含有大量中孔,产品中孔体积为0.43~0.67cm^3·g^-1,总孔体积高达1.53cm^3·g^-1。磷酸浸渍炭化料活化过程所得活性炭没有中孔产生,最高比表面积及总孔容分别为923m^2·g^-1,0.35cm^3·g^-1。可见磷酸浸渍毛竹活化过程更有利于孔隙发达活性炭的制备。
The activated carbons were prepared from bamboo flotsams with phosphoric acid activation. In order to investigate the effects of phosphoric acid activation process on the pore structures of activated carbons, the bamboo was impregnated with H3PO4 before and after carbonization and followed by activation. The structure and properties of the products were measured based on N2 adsorption isotherms at 77 K. Results show that the products of the bamboo -impregnation activation progress have high specific surface area (1 485 -2 127 m^2·g^-1) and considerable mesopores, the mesopore volume of which is 0. 43 -0.67 cm^3·g^-1. And the total pore volume of products reaches 1.53 cm^3 ·g^-1. The products of the charcoal -impregnation activation progress have no mesopore produced, the highest specific surface and total pore volume are 923 m^2·g^-1 and 0.35 cm^3·g^-1, respectively. It is obvious that the bamboo - impregnation activation progress is helpful to the preparation of activated carbons with high porosity.