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• W2769875980 abstract "Radio-cesium constitutes major environmental threats. Sorption of hazardous species onto geopolymeric sorbents is relatively recent and may give information about the retention mechanisms when geopolymers are applied to immobilize radwastes. Here, Na-MK, K-MK, Na-MKBFS, and K-MKBFS geopolymeric sorbents were synthesized from metakaolin (MK) and blast furnace slag (BFS) and were characterized using XRD, XRF, FT-IR, DTA/TGA and SEM. FT-IR/XRF results clarified the impact of mono-valent alkali cation (M+) in dividing the sorbents into Al-rich (sodium-based) and Si-rich (potassium-based). All sorbents were amorphous to semi-crystalline containing mica-phyllosilicates (greater in Si-rich), tobermorites (greater in MKBFS-based), gehlenite, calcite, quartz, hematite and hydrotalcite. Isotherms of 134Cs radionuclide sorption were constructed, being regular with a positive temperature effect. Al-rich sorbents gave higher sorption capacities than Si-rich ones. Na-MK sorbent recorded the more distinctive sorption capacity (74.95mg/g; at 333K). Langmuir, Freundlich and D-R models were used to disclose the capacities and mechanisms governing the sorption processes. Sorption of Cs+ onto the examined sorbents was favorable. All systems were controlled by ion exchange mechanism, except 134Cs/K-MK system which was controlled by physi- sorption mechanism. 134Cs/Na-MK GP system was the only spontaneous among all. The endothermic natures were the common denominator between the tested systems." @default.
• W2769875980 created "2017-12-04" @default.
• W2769875980 creator A5008773817 @default.
• W2769875980 creator A5048493251 @default.
• W2769875980 date "2018-02-01" @default.
• W2769875980 modified "2023-09-25" @default.
• W2769875980 title "Impact of alkali cations on properties of metakaolin and metakaolin/slag geopolymers: Microstructures in relation to sorption of 134Cs radionuclide" @default.
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• W2769875980 doi "https://doi.org/10.1016/j.jhazmat.2017.11.049" @default.
• W2769875980 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/29195102" @default.
• W2769875980 hasPublicationYear "2018" @default.
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