Porous silica synthesis out of coal fly ash with no residue generation and complete silicon separation
Received date: 29 Jan 2023
Revised date: 16 Mar 2023
Accepted date: 16 Mar 2023
Copyright
● Both amorphous and crystalline silicon are completely separated from coal fly ash. ● Porous silica is synthesized out of coal fly ash. ● No residues is produced during the whole synthesis process. ● The one-step method to synthesize silica don’t need long-time reaction and aging.
Ordered mesoporous silica materials exhibit enormous potential in industrial production. Since coal fly ash (CFA) is abundant in Si, it has become a green and promising way to utilize CFA by synthesizing porous silica materials. However, the stable crystalline structure of CFA limits the extraction of Si, and the residue is generated during the process of extracting Si. In this work, we proposed a no-residue method to synthesize ordered mesoporous silica out of CFA. Sodium carbonate (Na2CO3) was used to reconstruct the crystals of the CFA, and the calcined mixture then directly reacted with the precipitators. This method combined the process of Si extraction and porous material synthesis. In this method, no residue was generated and the silicon in both amorphous and crystalline phases of CFA was fully utilized. By this method, the extraction efficiency of Si was increased from 31.75% to nearly 100%. The as-synthesized mesoporous silica had a highly-ordered pore structure with a space group of la-3d, a surface area of 663.87 m2/g, a pore volume of 0.41 cm3/g, and an average pore diameter of 2.73 nm. The mechanism of crystalline transformation and material structure formation were systematically studied. This method provides a new idea to dispose of CFA and synthesize porous silica materials.
Tongyao Ju , Siyu Han , Fanzhi Meng , Li Lin , Jinglin Li , Kailun Chen , Jianguo Jiang . Porous silica synthesis out of coal fly ash with no residue generation and complete silicon separation[J]. Frontiers of Environmental Science & Engineering, 2023 , 17(9) : 112 . DOI: 10.1007/s11783-023-1712-2
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