Institute of Chemistry, Federal University of Rio Grande do Sul, UFRGS, Porto Alegre, Rio Grande do Sul, Brazil.
J Hazard Mater. 2010 Sep 15;181(1-3):366-74. doi: 10.1016/j.jhazmat.2010.05.019. Epub 2010 May 11.
The octosilicate Na-RUB-18 has the ability to exchange its original sodium with cetyltrimethylammonium cations. This procedure leads to interlayer space expansion, with the aim of obtaining inorganic-organic nanostructured hybrids by chemical modification reactions. The silylating agent 3-trimethoxysilylpropylurea was attached to the inorganic layer using heterogeneous methodology. The new organofunctionalized material was characterized by elemental analysis, X-ray diffraction, (13)C and (29)Si nuclear magnetic resonances in the solid state, infrared spectroscopy, thermogravimetry and scanning electron microscopy. The amount of silylating agent immobilized on surface was 2.03 mmol g(-1), with a basal distance of 2.43 nm. Nuclear magnetic resonance of (13)C and (29)Si nuclei evidenced covalent bond formation between organosilyl and silanol groups at the surface. The new synthesized nanostructured layered material was able to remove the textile dye Reactive Black 5 from aqueous solution, followed through a batchwise process. The effects of stirring time, adsorbent dosage and pH on the adsorption capacity demonstrated that 150 min is enough to reach equilibrium at 298+/-1 K at pH 3.0. Based on error function values the data were best fitted to fractional-order kinetic models and compared to pseudo-first-order, pseudo-second-order and chemisorption kinetic models. The equilibrium data were better fitted to the Sips isotherm models.
具有八硅酸钠结构的 Na-RUB-18 能够将其原始的钠离子与十六烷基三甲基溴化铵阳离子进行交换。该过程会导致层间距扩大，目的是通过化学修饰反应获得无机-有机纳米结构杂化材料。使用非均相方法将硅烷化试剂 3-三甲氧基丙基脲连接到无机层上。通过元素分析、X 射线衍射、固态（13）C 和（29）Si 核磁共振、红外光谱、热重分析和扫描电子显微镜对新的有机官能化材料进行了表征。表面固定的硅烷化剂量为 2.03mmol g(-1)，基面间距为 2.43nm。（13）C 和（29）Si 核的核磁共振表明，有机硅烷和表面硅醇基团之间形成了共价键。这种新合成的纳米结构层状材料能够从水溶液中去除活性黑 5 等纺织染料，随后通过分批处理。搅拌时间、吸附剂用量和 pH 对吸附容量的影响表明，在 298+/-1 K 下 pH 为 3.0 时，150min 即可达到平衡。基于误差函数值，数据最好拟合分数阶动力学模型，并与伪一阶、伪二阶和化学吸附动力学模型进行比较。平衡数据更符合 Sips 等温线模型。
