This research describes the development of a very cheap mesoporous silica material similar to hexagonal mesoporous silica (HMS) and using a silicate extract as precursor. This precursor is obtained from cheap fly ash by an easy calcination process at 850 °C and a green extraction with water. The obtained mesoporous fly ash material had a surface area of 282 m² g⁻¹ and a pore size of 5.7 nm. It was functionalized with ethylene diamino moieties via the well-known SAMMS method, followed by a DRIFT analysis that clearly showed the successful functionalization. An excellent adsorbent was obtained for the adsorption of sulfate anions by the solid's modification with copper forming a copper-ethylenediamine complex. The adsorption of sulfates was studied in a batch system where the pH at highest adsorption 8 was and the adsorption time remarkably fast (5 min). The kinetic data were fitted according to a pseudo-second order model with a high coefficient of linear regression at different initial concentrations. The adsorption isotherm that best fitted the experimental data was the Freundlich model. The maximum sulfate adsorption capacity of this very cheap fly ash based adsorbent was 146.1 mg g⁻¹, 3 times greater than the values reported in literature and commercial adsorbent materials.

这项研究描述了一种非常便宜的介孔二氧化硅材料的开发，该材料类似于六角形介孔二氧化硅（HMS），并使用硅酸盐提取物作为前体。该前体是通过在850°C下轻松煅烧并用水进行绿色萃取而从廉价的粉煤灰中获得的。所得的中孔飞灰材料的表面积为282m ²  g ^-1孔径为5.7 nm。通过众所周知的SAMMS方法，将其用亚乙基二氨基部分进行功能化，然后进行DRIFT分析，清楚地表明成功进行了功能化。通过用铜形成铜-乙二胺络合物的固体改性，获得了优异的吸附硫酸根阴离子的吸附剂。在间歇式系统中研究了硫酸盐的吸附，其中最高吸附8的pH为8，吸附时间非常快（5分钟）。根据在不同初始浓度下具有高线性回归系数的伪二级模型拟合动力学数据。最适合实验数据的吸附等温线是Freundlich模型。这种非常便宜的粉煤灰基吸附剂的最大硫酸盐吸附能力为146.1 mg g^-1，比文献和商用吸附剂材料中报道的值大3倍。