Wu Feng-Chin, Tseng Ru-Ling
Department of Chemical Engineering, National United University, Miao-Li 360, Taiwan.
J Hazard Mater. 2008 Apr 15;152(3):1256-67. doi: 10.1016/j.jhazmat.2007.07.109. Epub 2007 Aug 6.
In this study, the surface coverage ratio (Sc/Sp) and monolayer cover adsorption amount per unit surface area (qmon/Sp) were employed to investigate the adsorption isotherm equilibrium of the adsorption of dyes (AB74, BB1 and MB) on NaOH-activated carbons (FWNa2, FWNa3 and FWNa4); the adsorption rate of the Elovich equation (1/b) and the ratio of 1min adsorption amount of adsorbate to the monolayer cover amount of adsorbate (q1/qmon) were employed to investigate adsorption kinetics. The qmon/Sp of NaOH-activated carbons was better than that of KOH-activated carbons prepared from the same raw material (fir wood). The Sc/Sp values of the adsorption of all adsorbates on adsorbent FWNa3 in this study were found to be higher than those in related literature. Parameters 1/b and q1 of the adsorption of dyes on activated carbons in this study were higher than those on KOH-activated carbons; the q1/qmon value of FWNa3 was the highest. The pore structure and the TPD measurement of the surface oxide groups were employed to explain the superior adsorption performance of FWNa3. A high surface activated carbon (FWNa3) with excellent adsorption performance on dyes with relation to adsorption isotherm equilibrium and kinetics was obtained in this study. Several adsorption data processing methods were employed to describe the adsorption performance.
在本研究中，采用表面覆盖率（Sc/Sp）和单位表面积的单层覆盖吸附量（qmon/Sp）来研究染料（AB74、BB1和MB）在NaOH活化炭（FWNa2、FWNa3和FWNa4）上的吸附等温线平衡；采用Elovich方程的吸附速率（1/b）以及吸附质1min吸附量与吸附质单层覆盖量的比值（q1/qmon）来研究吸附动力学。NaOH活化炭的qmon/Sp优于由相同原料（杉木）制备的KOH活化炭。本研究中所有吸附质在吸附剂FWNa3上的Sc/Sp值均高于相关文献中的值。本研究中染料在活性炭上吸附的参数1/b和q1高于在KOH活化炭上的参数；FWNa3的q1/qmon值最高。采用孔隙结构和表面氧化物基团的程序升温脱附测量来解释FWNa3优异的吸附性能。本研究获得了一种对染料在吸附等温线平衡和动力学方面具有优异吸附性能的高比表面积活性炭（FWNa3）。采用了几种吸附数据处理方法来描述吸附性能。
