Dudarko O A, Barany S
Chuiko Institute of Surface Chemistry NAS of Ukraine 17, General Naumov str. Kyiv 03164 Ukraine
Institute of Chemistry, University of Miskolc Miskolc Egyetemvaros H-3515 Hungary.
RSC Adv. 2018 Nov 7;8(65):37441-37450. doi: 10.1039/c8ra07119e. eCollection 2018 Nov 1.
An original method for the one-stage synthesis of sulfur-containing silica of SBA-15 type is developed and described. Instead of tetraethylorthosilicate (TEOS) typically used as a source of silica, the inexpensive sodium metasilicate has been applied in our method. The mesoporous silica material was first functionalized with thiol groups then oxidized by concentrated nitric acid to produce sulfonic groups. The samples obtained possess developed specific surface area ( = 320-675 m g) and porous structure with an effective pore diameter of 3.5-5.7 nm. The orderliness of the structure and presence of surface sulfur-containing acidic groups of various natures in the synthesized materials were determined using XRD, TEM, N adsorption, conductivity and potentiometric titration methods. Based on the results of the measurements of the zeta potential pH and electrolyte concentration, conclusions about the electro-surface properties and aggregation stability of sample dispersion have been drawn. The obtained samples are environmentally-friendly and could be used in green chemistry.
开发并描述了一种用于一步合成SBA - 15型含硫二氧化硅的原始方法。在我们的方法中，使用了廉价的偏硅酸钠，而不是通常用作硅源的正硅酸乙酯（TEOS）。首先用硫醇基团对介孔二氧化硅材料进行功能化，然后用浓硝酸氧化以产生磺酸基团。所获得的样品具有发达的比表面积（ = 320 - 675 m²/g）和有效孔径为3.5 - 5.7 nm的多孔结构。使用XRD、TEM、N吸附、电导率和电位滴定法确定了合成材料中结构的有序性以及各种性质的表面含硫酸性基团的存在。基于ζ电位、pH和电解质浓度的测量结果，得出了关于样品分散体的电表面性质和聚集稳定性的结论。所获得的样品对环境友好，可用于绿色化学。
