2026-04-17T09:03:41Zhttps://riubu.ubu.es/oai/requestoai:riubu.ubu.es:10259/108602025-09-12T00:05:34Zcom_10259_4249com_10259_5086com_10259_2604col_10259_4250
Repositorio Institucional de la Universidad de Burgos
author
Russo, Raffaele Emanuele
author
Santoni, Elisa
author
Fattobene, Martina
author
Giovini, Mattia
author
Genua, Francesco
author
Leonelli, Cristina
author
Lancellotti, Isabella
author
Herrero Gutiérrez, Ana
author
Berrettoni, Mario
2025-09-11T11:19:14Z
2025-09-11T11:19:14Z
2025-08
1420-3049
https://hdl.handle.net/10259/10860
10.3390/molecules30153235
1420-3049
Alkali-activated aluminosilicate matrices are increasingly studied for their ability to stabilize hazardous metal contaminants via alkali activation at room temperature. In this study, metakaolin-based geopolymers were used to immobilize chromium and nickel salts, with systematic variation of key synthesis parameters, Na/Al molar ratio, metal concentration, anion type, and alkaline solution aging time, which have not been previously studied. A Design of Experiments approach was employed to study the effect of factors on metal leaching behavior and to better understand the underlying immobilization mechanisms. The analysis revealed that higher Na/Al ratios significantly enhance geopolymerization and reduce metal release, as supported by FTIR spectral shifts and decreased shoulder intensity. Notably, aging time had an influence on chromium behavior due to its effect on early silicate network formation, which can hinder the incorporation of chromium species. All tested formulations achieved metal immobilization rates of 98.8% or higher for both chromium and nickel. Overall, this study advances our understanding of geopolymer-based heavy metal immobilization.
eng
Atribución 4.0 Internacional
Alkali activation
Metakaolin-based geopolymer
Chromium salts
Nickel salts
Heavy metal stabilization
Multivariate approach
Design of experiments
Principal component analysis
Design of Experiments Approach for Efficient Heavy Metals Stabilization Using Metakaolin-Based Geopolymers
info:eu-repo/semantics/article
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URL
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Russo_molecules_2025.pdf