Abstract
Ordered mesoporous materials have attracted much attention owing to their superior structural properties. In this work, we develop a green and facile method to convert coal fly ash, a cheap, abundant, and silicon-rich industrial waste, into highly ordered mesoporous nanosilica. An energy-efficient technique, the alkali-dissolution process, was systematically studied for the extraction of silica from waste materials, instead of the conventional alkaline fusion method. The extraction efficiency of silica could reach up to 46.62% within 0.5 h at 110 °C in 25 wt % sodium hydroxide solution, and the liquid–solid ratio was reduced to 1.5:1. Subsequently, simulated flue gas was introduced to precipitate the nanosilica with the assistance of a surfactant through a twice-carbonation process. A series of characterization techniques confirmed that the synthetic nanosilica (SiO2-0.16) has a high purity (99.35%), high surface area (1,157 m2 g–1), large pore volume (0.95 cm3 g–1), and a highly ordered hexagonal mesostr...
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