利用染料吸附评价活性炭纤维结构的初步研究

研究了一系列不同结构的活性炭纤维对水溶液中碘、酚及亚甲基蓝、结晶紫、二甲酚橙的吸附特征。揭示了染料在活性炭纤维上吸附量的大小，明显受活性炭纤维孔宽的屏蔽作用（分子筛效应）的影响。初步提出可利用染料吸附特征与活性炭纤维的孔宽和染料分子的几何尺寸的相关性，简便地评价活性炭纤维的孔结构和液相吸附性能。

ASSESSMENT OF THE STRUCTURE OF ACTIVATED CARBON FIBERS BY THE ADSORPTION OF DYES

The assessment of the pore structure and the adsorption properties of activated carbon fibers (ACF) are so far based on the standards for active carbons.However, the structure of ACF is, after all, different from that of active carbon. therefore,more detail works are meeded in order to evaluate reasonably the structure and properties of ACFs. In this paper the adsorption characteristics of Iodine, phenol and dyes methylene blue, cystal violet and xylenol orange on a varity of activated carbon fibers (SACFs) with different pore structure have been studied. The results indicated that the adsorption amount of Iodine, phenol, and dyes are proportional to the surface areas of ACFs, the adsorption of these dyes on ACFs are also determined by pore width of ACFs, that is, it is affected by pore screening. The adsorption amount of dyes on per square meter surface of ACF increases with the pore width of ACF.In the dye adsorption curve on a variety of ACFs there is a steep adsorption of dye, then the curve bend to a gradual adsorption plateau with of ACFs. The bending point may correspond to the width that allows the dye molecules to go through. It is evident that the bending point varies with dyes. Therefore, it is propossed that the correlativity of dye adsorption with the pore width of ACFs and the geometric dimension of dyes would be applied to the assessment of the structure of ACF or the liquid phase adsorption properties of ACFs.