Department of Materials Science and Chemical Engineering, Polytechnic of Torino, Corso Duca degli Abruzzi 24, I10129 Torino, Italy.
J Environ Sci (China). 2010;22(3):467-73. doi: 10.1016/s1001-0742(09)60131-5.
Batch adsorption from aqueous solutions in a slightly basic medium of Methylene Blue, up to 2500 mg/L, onto synthetic magnesium silicate (Florisil) of three particle size ranges (mean diameters of 112, 200 and 425 microm) was compared to the corresponding adsorption onto activated carbon and Amberlite XAD-2. The best fit of the kinetic results was achieved by a pseudo second-order equation. The equilibrium data were found to be well represented by the Langmuir isotherm equation. Amberlite XAD-2, an unspecific adsorbent capable of adsorbing exclusively through a surface effect, exhibited a poor dye uptake, confirming that the adsorption mechanism on Florisil was due to electrostatic attraction and ion exchange. Moreover, the comparison between Florisil and the other adsorbents was performed on the basis of the evaluation of the surface area and pore volume occupied by the adsorbed dye.
在微碱性介质中，从水溶液中批量吸附亚甲蓝，最高可达 2500mg/L，分别使用三种粒径范围（平均直径为 112、200 和 425 微米）的合成硅酸镁（弗罗里硅土）与活性炭和 Amberlite XAD-2 进行比较。动力学结果的最佳拟合是由伪二级方程实现的。平衡数据通过 Langmuir 等温线方程得到很好的表示。Amberlite XAD-2 是一种非特异性吸附剂，只能通过表面效应吸附，对染料的吸附量较差，这证实了 Florisil 上的吸附机制是由于静电吸引和离子交换。此外，基于吸附染料占据的表面积和孔体积的评估，在 Florisil 和其他吸附剂之间进行了比较。
