氯化锌活化大麻布活性炭纤维的孔结构

以大麻布为原料,氯化锌为活化剂,在不同活化温度下制备大麻布活性炭纤维样品。采用低温氮气吸附和密度函数理论(DFT)等对样品的孔结构和表面能量分布等表面织构特征进行了研究。结果表明,样品BET比表面积随活化温度的升高呈现先增大后减小的变化趋势,800℃时达到最大值915 m2/g;样品是典型的微孔材料,孔分布集中于2 nm以下的微孔范围内,只有极少部分的中孔,基本没有大孔;样品的表面能量分布较宽,为不均匀性表面;随活化温度的升高,样品碘吸附量呈先增大后减小的变化趋势,与微孔孔容、总孔容以及由BET比表面积的变化趋势一致。

Pore structure of hemp cloth-derived carbon fibers activated by zinc chloride

Hemp cloth-derived carbon fibers have been prepared by a ZnCl₂ activation method. The pore structure of the resulting samples was characterized by N₂ adsorption and the surface energy distribution was analyzed by the DFT method. The BET specific surface area of the hemp cloth-derived activated carbon fibers first increased and then decreased with increasing temperature, and reached a maximum of 915 m²/g at 800 ℃.The samples were all typical microporous materials. The pore size distribution was mainly within the 2 nm micropore region. All the samples possessed a small fraction of mesopores, but no macropores. The samples had wide surface energy distributions and heterogeneous surfaces. As the activation temperature was increased, the iodine adsorption amount of the materials showed an initial increase followed by a decrease, which follows the same trend as for micropore volume, total pore volume and BET specific surface area.