Abstract An increasing amount of waste sodium-based slag was generated during the purification process of metallurgical silicon that causes a posed problem to the environment. Here, a simple but effective approach was developed for the synthesis of mesoporous silicon from waste sodium-based slag. The as-received slag was leached and then calcined to fabricate silica as a precursor. Subsequently, the nanostructured silicon was produced through the reduction of the silica in a magnesium (Mg) vapor. The mechanism suggested that the Mg-containing phases (Mg2Si, MgSiO3, and MgO) were performed as an intermediary agent and facilitated the formation of nano-scale silicon. Nitrogen (N2) adsorption study of the final silicon product showed a BET surface area of 75.5 m2/g and a distributional BJH pore size of 3.7 nm. Significantly, the N2 absorption capacity of the mesoporous silicon reached 200 m3/g. The aim of this study is to recycle the waste sodium-based slag and provide an alternative for the synthesis of mesoporous silicon materials.

中文翻译：

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以工业废钠基渣为原料合成介孔硅

摘要 冶金硅提纯过程中产生越来越多的废钠基渣，给环境带来了问题。在这里，开发了一种简单但有效的方法，用于从废钠基炉渣中合成介孔硅。将收到的炉渣浸出，然后煅烧以制造二氧化硅作为前体。随后，通过在镁 (Mg) 蒸气中还原二氧化硅来生产纳米结构的硅。该机制表明，含镁相（Mg2Si、MgSiO3 和 MgO）作为中间剂，促进了纳米级硅的形成。最终硅产品的氮 (N2) 吸附研究表明 BET 表面积为 75.5 m2/g，分布的 BJH 孔径为 3.7 nm。显着地，介孔硅的N2吸收能力达到200 m3/g。本研究的目的是回收废钠基炉渣，为介孔硅材料的合成提供一种替代方案。