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- W4386026171 abstract "Geopolymers have emerged as a promising solution for solidifying heavy metals; however, the underlying mechanisms remain elusive. In this study, we synthesized geopolymers incorporating Pb2+ and Cd2+ to unravel their solidification mechanisms. Leaching analyses demonstrated superior solidification efficacy for Pb2+ (93.6%) compared to that for Cd2+ (65.2%). The dissimilarity in solidification mechanisms can be attributed to variances in ionic potential and covalent interactions between the cations. Furthermore, Cd2+ exhibited a higher ionic potential, facilitating its exchange with Na+ in the geopolymer matrix. Triple-quantum nuclear magnetic resonance experiments revealed a weak affinity of the geopolymer structure toward Cd2+. Density functional theory calculations affirmed stronger interactions between Pb2+ (−8.71 eV) and the matrix compared to those of Cd2+ (−5.83 eV). Consequently, Pb2+ demonstrated an enhanced covalent propensity within the geopolymer matrix, while Cd2+ primarily underwent solidification via ion exchange. This research provides novel insights and concepts regarding the mechanisms involved in solidifying heavy metals in geopolymers." @default.
- W4386026171 created "2023-08-22" @default.
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- W4386026171 date "2023-08-21" @default.
- W4386026171 modified "2023-10-13" @default.
- W4386026171 title "Structural Evolution of Geopolymers Incorporated with Heavy Metals: Solidification Mechanism of Pb<sup>2+</sup> and Cd<sup>2+</sup>" @default.
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- W4386026171 doi "https://doi.org/10.1021/acs.jpcc.3c03924" @default.
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