Novel process for facile preparation of mesoporous silica-based materials with controllable pore structure from coal fly ash

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外文摘要：Extraction of silica from fly ash to produce mesoporous silica materials is one of the most important utilization approaches.Mesoporous silica could not be synthesized on a large-scale by conventional sol-gel method.In this paper,facile preparation of mesoporous silica with controllable pore structure from fly ash by the template-free process via two steps of mineral phase transformation and selective acid etching was proposed.The influence of crystalline structure and acid etching degree on structure of as-synthesized mesoporous silica materials was revealed,as well as mechanism of crystalline structure transformation and pore structure formation.The results show that mullite and quartz could be trans-formed into acid-soluble kaliophilite when fly ash reacted with K2CO3 at temperature of 800-1100 ℃.The hexagonal kaliophilite would be transformed into orthorhombic KAlSiO4-O1 phase when the temperature is controlled at 1100 ℃.Mesoporous silica with specific surface area of 475.93 m2/g and 642.57 m2/g could be synthesized from activated fly ash with kaliophilite and KAlSiO4-O1 phase crys-talline structure.By controlling the degree of acid etching,mesoporous silica materials with different pore structures can be obtained.This paper provides a cost-effective and large-scale process for the preparation of mesoporous silica materials with controllable pore structure from solid waste fly ash.

外文关键词：

Fly ashMesoporous silicaCrystal transformationAcid etchingControllable pore structure

作者：

Jian-ming Gao、Zhen Li、Shujia Ma、Yuanyuan Zhang、Fangqin Cheng

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作者单位：

Institute of Resources and Environment Engineering,State Environmental Protection Key Laboratory of Efficient Utilization Technology of Coal Waste Resources,Shanxi Collaborative Innovation Center of High Value-added Utilization of Coal-related Wastes,Shanxi University,Taiyuan 030006,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaShanxi Province Central Government Guided Local Science and Technology Development Fund ProjectShanxi Province Scientific and Technological Innovation Project of Colleges and Universities

项目编号：

U21A2032121908138YDZJSX2022A0042020L0009

出版年：

2024

DOI：

10.1016/j.partic.2024.03.001

颗粒学报(英文版)

中国颗粒学会　中国科学院过程工程研究所

颗粒学报(英文版)

CSTPCD

影响因子：0.632

ISSN：1674-2001

年,卷(期)：2024.91(8)