Gómez-Tamayo M del Mar, Macías-García Antonio, Díaz Díez M Angeles, Cuerda-Correa Eduardo M
Department of Electronics and Electromechanical Engineering, Area of Materials Science, School of Industrial Engineering, University of Extremadura, Badajoz, Spain.
J Hazard Mater. 2008 May 1;153(1-2):28-36. doi: 10.1016/j.jhazmat.2007.08.012. Epub 2007 Aug 11.
In the present work activated carbons have been prepared from evergreen oak wood. Different samples have been prepared varying the concentration of the activating agent (H(3)PO(4)) and the treatment temperature. The yield of the process decreases with increasing phosphoric acid concentrations. Furthermore, high concentrations of activating agent lead to mainly mesoporous activated carbons to the detriment of the microporous texture. Treatment temperatures up to 450 degrees C lead to a progressive increase of the micro- and mesopore volumes. Values of specific surface area (S(BET)) as high as 1723 m(2) g(-1)have been obtained using appropriate phosphoric acid concentrations and treatment temperatures. The samples prepared have been successfully used in the removal of Zn(II) from aqueous solutions. From the adsorption kinetic data it may be stated that the equilibrium time is, in all cases, below 170 h. The adsorption process as a rule becomes faster as the mesopore volume and specific surface area of the samples increase. The adsorption isotherms in liquid phase point out that the adsorption capacity (n(0)(s)) and the affinity towards the solute (K(ci)) are higher for the sample showing the most developed mesoporous texture and surface area as well.
在本研究中，以常绿橡木为原料制备了活性炭。通过改变活化剂（H₃PO₄）的浓度和处理温度制备了不同的样品。随着磷酸浓度的增加，该过程的产率降低。此外，高浓度的活化剂主要导致中孔活性炭，损害了微孔结构。高达450℃的处理温度导致微孔和中孔体积逐渐增加。使用适当的磷酸浓度和处理温度，获得了高达1723 m² g⁻¹的比表面积（S(BET)）值。所制备的样品已成功用于从水溶液中去除Zn(II)。从吸附动力学数据可以看出，在所有情况下，平衡时间均低于170 h。通常，随着样品中孔体积和比表面积的增加，吸附过程会变得更快。液相吸附等温线表明，对于具有最发达中孔结构和表面积的样品，其吸附容量（n₀(s)）和对溶质的亲和力（K(ci)）也更高。
