地质聚合物原位转化沸石分子筛的研究进展

doi:10.11896/cldb.19080095

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Abstract Zeolite is a type of inorganic crystal material with a specific-Si(Al)-O-Si-skeleton structure. It is widely used in the fields of adsorption, separation, ion exchange and catalysis due to its unique network structure. Generally, the zeolites are synthesized by hydrothermal method, in which the chemical reagents are used as aluminum source and silicon source, and the template and co-template are added to perform the hydrothermal reaction under a certain temperature and acid or base conditions. Although there are some advantages in traditional hydrothermal method such as the prepared powder with well-defined crystals, and small-sized particles, there are some disadvantages such as expensive raw materials and secondary pollution caused in the forming process. Geopolymer is a novel kind of green cementitious material which is formed by the reaction of natural mineral or aluminosilicate solid wastes with alkaline activator. The conversion of geopolymer into bulk zeolite in-situ not only eco-friendly utilization of natural mineral and aluminosilicate solid waste as raw materials, without the addition of template agents, low cost, and mild reaction conditions, but also the prepared bulk zeolites to simplify the forming process of using powder zeolite, and this is a new technique for synthesis of bulk zeolite.
Thermodynamically, it is difficult to convert amorphous geopolymers into zeolite under ambient temperature and pressure, but under the certain curing or hydrothermal conditions, the geopolymer can be converted into zeolite in-situ. Some main factors affect the types and microstructures of zeolites produced, such as raw material composition, the mole ratios of Si/Al, Na₂O/SiO₂ and H₂O/Na₂O, activator concentration, hydrothermal temperature and time. The mechanism about conversion of geopolymer into zeolite in-situ can be divided into the metal cation structural guidance, the organic template structural guidance and the seed structural guidance mechanisms. The bulk zeolites have some potential applications in the field of desalination, alcohol-water separation, adsorption of heavy metal ions, and gas adsorption. Therefore, it is a new approach to convert the geopolymer with amorphous structure into the zeolite with crystal structure. Thus, the production chain of geopolymers and application value are extended. In this paper, the problems and solutions for the conversion of geopolymers into bulk zeolites are put forward and the development in future is prospected.

Key words： geopolymer in-situ conversion zeolite alkali activator hydrothermal reaction

Published: 24 December 2020

CLC number:

TQ172

Fund:This work was financially supported by the National Natural Science Foundation of China (21676209), the Key Research and Development Project of Shaanxi Province (2019GY-137) and Cultivating Fund of Excellent Doctorate Thesis of Xi’an University of Architecture and Technology (6040318008).

About author:: Yaojun Zhang, vice chairman of the Shaanxi Nanotechnology Society, member of the Chemical Cementitious Materials Committee of the Chinese Ceramic Society, and member of the Solid Waste Professional Committee of the Chinese Ceramic Society,is currently a full professor in the School of Materials Science and Engineering, Xi’an University of Architecture and Techno-logy. He has long been engaged in research in related fields such as nanomaterials and solid waste resource utilization, obtaining a large number of systematic and innovative research results. Meanwhile he has published more than 80 papers as the first author or corresponding author, obtained more than 40 national invention patents, published several monographs. He has won awards such as outstanding teachers in Shaanxi Province and excellent teaching achievements at the national level,and undertook more than ten projects such as the National Basic Research Plan (973) and the Shaanxi Provincial Science and Technology Plan Industrial Research.

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	ZHANG Yaojun
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Cite this article:

ZHANG Yaojun,ZHANG Ye,HAN Zhichao, et al. Research Progresses on In-situ Conversion of Geopolymer into Zeolite[J]. Materials Reports, 2020, 34(23): 23033-23041.

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http://www.mater-rep.com/EN/10.11896/cldb.19080095 OR http://www.mater-rep.com/EN/Y2020/V34/I23/23033

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