Wei Jian, Zhu Pinghua, Sun Hao
Audit Office, Changzhou University, Changzhou 213164, China.
Department of Civil Engineering, Changzhou University, Changzhou 213164, China.
Materials (Basel). 2022 Feb 15;15(4):1454. doi: 10.3390/ma15041454.
In this paper, we report a new and convenient method for the synthesis of insulating aerogel by recycling solid waste coal gangue, which can reduce the industrial production cost of silica aerogels and realize high value-added utilization of solid waste. Sodium silicate was prepared from a cheap industrial waste coal gangue as the precursor for silica aerogels, which was used for silica wet gel preparation by a one pot method; this method of solvent exchange/surface modification was carried out quickly by mechanical stirring process, and the wet gels derived from coal gangue were dried under ambient pressure condition. A high surface area (748 m/g) nanostructured aerogel with a 3D open porous microstructure was synthesized, which exhibits a low density (0.18 g/cm) and a superior thermal insulation performance (~0.033 W·m·K). More significantly, the synthetic yield of silica aerogel powder by recycling coal gangue can reach 92%.
在本文中，我们报道了一种通过回收固体废弃物煤矸石来合成绝缘气凝胶的新型便捷方法，该方法可降低二氧化硅气凝胶的工业生产成本，并实现固体废弃物的高附加值利用。以廉价的工业废弃物煤矸石为前驱体制备硅酸钠，用于二氧化硅气凝胶的制备，采用一锅法制备二氧化硅湿凝胶；通过机械搅拌过程快速进行溶剂交换/表面改性，将源自煤矸石的湿凝胶在常压条件下干燥。合成了具有三维开放多孔微观结构的高比表面积（约748 m²/g）纳米结构气凝胶，其具有低密度（约0.18 g/cm³）和优异的隔热性能（约0.033 W·m⁻¹·K⁻¹）。更重要的是，通过回收煤矸石制备二氧化硅气凝胶粉末的合成产率可达92%。
