Abstract
A one-step facile method without any surfactants and autoclaves has been proposed to synthesis bulk zeolite A through metalkaolin-based geopolymer gels. The geopolymer gels could be in situ transformed to zeolite A during geopolymerization process when the samples were kept in the oven for a period of time. Influence of the synthesis temperature, curing time, Na/Al ratio and water–binder ratio on the structures, morphology and mechanical properties of the bulk zeolite A has also been studied. Results indicated that highly purified and crystallined zeolite A with Na/Al ratio of 1.0 and water–binder ratio of 0.7 could be obtained at 70 °C for 16 h. The non-crystallined geopolymer gels would bond the micro-particles of zeolite A with each other, which make the bulk samples have certain strength. The formation mechanism of the bulk zeolite A has also been discussed. Micropores and mesopores in the bulk zeolite A have been observed by nitrogen adsorption because of the coexistence of zeolite A phase and geopolymer phase. Meanwhile, the mercury intrusion porosimetry also confirmed the existence of macro-pores with 0.9 μm of pore-size and 39.2 % of porosity in the bulk body.
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Acknowledgments
This work was supported by National Natural Science Foundation of China (No. 51402246), Open Fund of State Key Laboratory Cultivation Base for Nonmetal Composites and Functional Materials (No. 13zxfk04) and Postgraduate Innovation Fund Project by Southwest University of Science and Technology (No. 15ycx002).
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Duan, J., Li, J. & Lu, Z. One-step facile synthesis of bulk zeolite A through metakaolin-based geopolymer gels. J Porous Mater 22, 1519–1526 (2015). https://doi.org/10.1007/s10934-015-0034-6
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DOI: https://doi.org/10.1007/s10934-015-0034-6