Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer

Soonthornwiphat, Natatsawas; Kobayashi, Y; Toda, Kanako; Kuroda, Koichiro; Chaerun, Raudhatul Islam; Otake, Tsubasa; Elakneswaran, Yogarajah; Provis, John L.; Satō, Tsutomu

doi:10.1080/00223131.2020.1775717

Cited by 14 publications

(2 citation statements)

References 30 publications

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“…The formation of a nepheline structure in geopolymer at 1200 °C for the blocking of Sr was proposed, which largely reduced the leaching rate in the deionized water [ 135 ]. In most cases, the radioactive Sr 2+ was firstly adsorbed onto adsorbents, such as zeolite A [ 136 ], clinoptilolite [ 137 ], and titanate ion exchangers [ 138 , 139 ], etc., which were then encapsulated in geopolymers, showing great S/S performance.…”

Section: Geopolymer-based S/s Processmentioning

confidence: 99%

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%

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

et al. 2022

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“…Geopolymers are one option for the solidification/stabilization of solid wastes, as they possess excellent properties, including acid and thermal resistance, low permeability, and low CO 2 emissions as compared with Portland cement [10]. Geopolymers are an alkali-activated material with little or no calcium that have a three-dimensional framework developed by the dissolution, polycondensation, and hardening of an aluminosilicate precursor in an alkali activator [10][11][12]. This material has a negative charge from the aluminate tetrahedral structure that is balanced by Na + or K + from the activator [13].…”

Section: Introductionmentioning

confidence: 99%

Immobilization Forms of Cadmium and Mercury in a Potassium-Activated Metakaolin-Based Geopolymer

Prihutami,

Chaerun,

Ohya

et al. 2024

Minerals

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Previous studies of cadmium and mercury immobilization in geopolymers have produced inconsistent results due to their different pozzolans, metal concentrations, and mixing procedures. Understanding the effects of these parameters on heavy metal immobilization is key to predicting their long-term stability. In this study, cadmium and mercury were incorporated into a metakaolin-based K-activated geopolymer by three mixing procedures and concentrations of 0.02–1.00 wt.%. The samples were then immersed in water for 90 d to determine their stability. The results show that mercury is readily leached from the geopolymer, but cadmium is retained. Adding the heavy metals in salt form converts the metals into cadmium hydroxide and mercury oxide that reside at the bottom of the geopolymer. Mixing the salts with water forms soluble heavy metals prior to geopolymerization. This procedure produces more-homogeneous geopolymers. Cadmium is associated with silicate and aluminate, giving a better stability, whereas mercury forms mercury oxide. Different cadmium and mercury concentrations do not change the metal speciation as mercury is affected by relativistic contribution.

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Utilization of Synthetic Gyrolite in Ordinary Portland Cement

Baltakys,

Dambrauskas

2024

Synthetic Gyrolite

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Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer

Abstract: This is a repository copy of Encapsulation of Sr-loaded titanate spent adsorbents in potassium aluminosilicate geopolymer.

Cited by 14 publications

References 30 publications

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

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

Immobilization Forms of Cadmium and Mercury in a Potassium-Activated Metakaolin-Based Geopolymer

Utilization of Synthetic Gyrolite in Ordinary Portland Cement

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