Immobilization of simulated 137CsCl using metakaolin based geopolymers obtained by hybrid hydrothermal-sintering processes

Chen, Song; Zhou, Zhengchun; Sun, Xiaowen

doi:10.1007/s10967-021-08048-5

Cited by 6 publications

(2 citation statements)

References 13 publications

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“…Furthermore, He et al [ 67 ] obtained pollucite with excellent S/S performance of Cs from geopolymer calcined at a low temperature (<1000 °C) via alkali metal ion doping and optimizing the Na/Cs ratio. Chen et al [ 124 ] proposed a hybrid hydrothermal-sintering process including a 200 °C hydrothermal process and an additional 1200 °C sintering process, which can effectively lower the amount of Cs lost to volatilization. To improve the efficiencies of pollucite formation, Xiang et al [ 125 ] adopted rapid microwave sintering to prepare Cs-defined ceramics, which can be formed at below 1100 °C within 30 min.…”

Section: Geopolymer-based S/s Processmentioning

confidence: 99%

“…Furthermore, He et al [67] obtained pollucite with excellent S/S performance of Cs from geopolymer calcined at a low temperature (<1000 °C) via alkali metal ion doping and optimizing the Na/Cs ratio. Chen et al [124] proposed a hybrid hydrothermal-sintering pro- Thermal treatment has been proposed as an effective method to further improve the S/S efficiency of Cs (Figure 3). Under high temperatures, geopolymer can be viewed as precursor for the formation of ceramic, and meanwhile, pollucite has been regarded as one of the most stable phases for the safe disposal of Cs [120].…”

Section: Csmentioning

confidence: 99%

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Application of Geopolymer in Stabilization/Solidification of Hazardous Pollutants: A Review

et al. 2022

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Geopolymers, as a kind of inorganic polymer, possess excellent properties and have been broadly studied for the stabilization/solidification (S/S) of hazardous pollutants. Even though many reviews about geopolymers have been published, the summary of geopolymer-based S/S for various contaminants has not been well conducted. Therefore, the S/S of hazardous pollutants using geopolymers are comprehensively summarized in this review. Geopolymer-based S/S of typical cations, including Pb, Zn, Cd, Cs, Cu, Sr, Ni, etc., were involved and elucidated. The S/S mechanisms for cationic heavy metals were concluded, mainly including physical encapsulation, sorption, precipitation, and bonding with a silicate structure. In addition, compared to cationic ions, geopolymers have a poor immobilization ability on anions due to the repulsive effect between them, presenting a high leaching percentage. However, some anions, such as Se or As oxyanions, have been proved to exist in geopolymers through electrostatic interaction, which provides a direction to enhance the geopolymer-based S/S for anions. Besides, few reports about geopolymer-based S/S of organic pollutants have been published. Furthermore, the adsorbents of geopolymer-based composites designed and studied for the removal of hazardous pollutants from aqueous conditions are also briefly discussed. On the whole, this review will offer insights into geopolymer-based S/S technology. Furthermore, the challenges to geopolymer-based S/S technology outlined in this work are expected to be of direct relevance to the focus of future research.

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Section: Geopolymer-based S/s Processmentioning

confidence: 99%

“…Furthermore, He et al [67] obtained pollucite with excellent S/S performance of Cs from geopolymer calcined at a low temperature (<1000 °C) via alkali metal ion doping and optimizing the Na/Cs ratio. Chen et al [124] proposed a hybrid hydrothermal-sintering pro- Thermal treatment has been proposed as an effective method to further improve the S/S efficiency of Cs (Figure 3). Under high temperatures, geopolymer can be viewed as precursor for the formation of ceramic, and meanwhile, pollucite has been regarded as one of the most stable phases for the safe disposal of Cs [120].…”

Section: Csmentioning

confidence: 99%