Gómez J M, Galán J, Rodríguez A, Walker G M
Chemical Engineering Department, CyPS Group, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain.
Chemical Engineering Department, CyPS Group, Complutense University of Madrid, Avda. Complutense s/n, 28040 Madrid, Spain.
J Environ Manage. 2014 Dec 15;146:355-361. doi: 10.1016/j.jenvman.2014.07.041. Epub 2014 Sep 6.
Mesoporous materials were used as adsorbents for dye removal in different media: non-ionic, buffered and saline. The mesoporous materials used were commercial (silica gel) as well as as-synthesised materials (SBA-15 and a novel mesoporous carbon). Dye adsorption onto all the materials was very fast and the equilibrium was reached before 1 h. The pH has a significant influence on the adsorption capacity for the siliceous materials since the electrostatic interactions are the driving forces. However, the influence of the pH on the adsorption capacity of the carbonaceous material was lower, since the van der Waals interactions are the driving forces. The ionic strength has a great impact on the siliceous materials adsorption capacity, being their adsorption capacity in a buffered medium six times higher than the corresponding to a non-ionic medium. Nevertheless, ionic strength does not influence on the dye adsorption on the mesoporous carbon. Overall, the as-synthesised carbon material presents a clear potential to treat dye effluents, showing high adsorption capacity (q(e) ≈ 200 mg/g) in all the pH range studied (from 3 to 11); even at low concentrations (C(e) ≈ 10 mg/L) and at short contact times (t(e) < 30 min).
介孔材料被用作吸附剂，用于在不同介质（非离子、缓冲和含盐介质）中去除染料。所使用的介孔材料包括商业产品（硅胶）以及合成材料（SBA - 15和一种新型介孔碳）。所有材料对染料的吸附都非常迅速，在1小时之前就达到了平衡。由于静电相互作用是驱动力，pH值对硅质材料的吸附容量有显著影响。然而，pH值对碳质材料吸附容量的影响较小，因为范德华相互作用是驱动力。离子强度对硅质材料的吸附容量有很大影响，其在缓冲介质中的吸附容量比在非离子介质中高六倍。然而，离子强度对介孔碳上染料的吸附没有影响。总体而言，合成的碳材料在处理染料废水方面具有明显的潜力，在所研究的所有pH范围（从3到11）内都显示出高吸附容量（q(e)≈200 mg/g）；即使在低浓度（C(e)≈10 mg/L）和短接触时间（t(e)<30分钟）下也是如此。
