The textural properties of amorphous silica play a fundamental role in its final properties and, therefore, in its possible applications. The aim of this study is to gain comprehensive understanding about how the process conditions influence the pore structure of silica synthesized below the isoelectric point and find possible solutions to tailor the final properties of nano-silica. This study was conducted using the mineral olivine as silica source and dissolving it in sulfuric acid. This synthesis method is an interesting and sustainable alternative to the existing commercial methods. This nano-silica exhibits a specific surface area in the range of 100–500 m²/g and a pore size distribution of 1–100 nm for silicas with a purity above 99%. At the beginning of the reaction, silica is microporous and mesoporous, showing no macroposity. As the reaction conversion progresses, silica particles become larger and macroporous, and internal porosity is developed. The process conditions have an important influence on the textural properties of nano-silica. By modifying the process conditions the small mesopores can be removed featuring no porosity below 9 nm and the large pores can be reduced to pore sizes as small as 30 nm. The possibility of tailoring the porosity of silica in this large range makes this material suitable for a wide range of applications.

无定形二氧化硅的质地性质在其最终性质以及因此在其可能的应用中起着基本作用。这项研究的目的是全面了解工艺条件如何影响等电点以下合成的二氧化硅的孔结构，并找到可能的方法来定制纳米二氧化硅的最终性能。这项研究是使用矿物橄榄石作为二氧化硅源并将其溶解在硫酸中进行的。这种合成方法是现有商业方法的一种有趣且可持续的替代方法。这种纳米二氧化硅的比表面积在100–500 m ²的范围内/ g，纯度超过99％的二氧化硅的孔径分布为1–100 nm。在反应开始时，二氧化硅是微孔和中孔的，没有大孔沉积。随着反应转化的进行，二氧化硅颗粒变得更大且大孔，并且形成了内部孔隙率。工艺条件对纳米二氧化硅的组织性能有重要影响。通过修改工艺条件，可以去除9纳米以下无孔的小中孔，并且可以将大孔缩小到30纳米。在较大范围内调整二氧化硅孔隙率的可能性使该材料适用于广泛的应用。