| Abstract:The pore structures of four different types of activated carbons, which included two wood-based activated carbons AC1, AC2, one coal-based activated carbon AC3 and one coconut-shell-based activated carbon AC4, were characterized by nitrogen adsorption method and scanning electron microscope. The activated carbon filter papers were prepared by papermaking process. The adsorption performances of the filter papers were characterized by adsorption values of methylene blue and phenol. The effect of pore structure characteristics of activated carbon on performance of activated carbon filter papers was studied. The results showed that: Among the four types of activated carbons, two types of wood-based activated carbons have larger specific surface areas and higher total pore volume, which are 1054 m2/g, 1.165 cm3/g and 1125 m2/g, 1.083 cm3/g respectively. Though the micropores mean diameters of the four activated carbons are similar, the mesopores and macropores mean diameters of the two wood-based activated carbons AC1 and AC2 are larger. In pore structure of wood-based activated carbon AC2, the micropores, mesopores and macropores volumes are higher than those of other samples. And the pores with diameters of about 0.64 nm, 1.2 nm and 2.3 nm are abundant. The selective adsorption of activated carbon AC2 is strong. So the filter papers made of activated carbon AC2 are the most effective in adsorption of methylene blue and phenol, and after filtration for three times the adsorption rates for methylene blue and phenol are 92.4% and 93.8% respectively. |
