Journal
JOURNAL OF CLEANER PRODUCTION
Volume 359, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jclepro.2022.132043
Keywords
Porous geopolymer; Fly ash; Porosity; Mechanical properties; Thermal properties; Adsorption
Categories
Funding
- National Natural Science Foundation of China [52002090]
- Heilongjiang Postdoctoral Science Foundation [LBH-Z19051]
- Fundamental Research Funds for the Central Universities [3072021CF1021, 3072021CF1003]
- Scientific Research Foundation for the Returned Overseas Chinese Scholars of Heilongjiang Province [2019QD0002]
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This review discusses the methods, characteristics, and applications of fly ash-based porous geopolymers, as well as the future development prospects.
A very large amount of fly ash is generated from coal combustion, and the high value-added and efficient utilization conversion of this solid waste into a resource remains an issue to be solved. Among the many methods of waste resource utilization, the preparation of porous geopolymers is an effective way to improve the added value of fly ash. In this review, the processes for obtaining fly ash-based porous geopolymers are divided into two categories: bulk-type (direct foaming, sacrificial template, additive manufacturing, and fast microwave foaming method) and sphere-type (suspension solidification, direct molding, and calcium chloride solution gel method). The synthesis routes, main characteristics (pore structure, porosity), and performance (mechanical and thermal properties as well as adsorption etc.) of fly ash-based porous geopolymers are reviewed, and examples of applications such as heat insulation, filtration, sound absorption, and pH buffering are presented. Moreover, the future development prospects of this field are discussed.
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