Work

Hydrothermally tailored high-basalt geopolymer for strength development and indigo carmine removal

Year: 2026

Type: article

Abstract: following acid activation. Thermodynamic analysis demonstrated that IC adsorption is an endothermic, entropy-driven, and spontaneous process at elevated temperatures. Nonlinear equilibrium analysis showed that the Redlich-Peterson model provided the best fit to the experimental data, while kinetic modeling indicated that IC adsorption proceeds through a multistage process involving surface adsorption and intraparticle diffusion. Interference studies demonstrated the influence of coexisting species on IC removal, providing additional insight into the adsorption behavior of Geo-BT5/H under more complex aqueous conditions. Furthermore, the geopolymer maintained excellent structural stability and adsorption performance after repeated adsorption-desorption cycles, as confirmed by FTIR and XRD analyses. These findings demonstrate that hydrothermally cured slag-basalt geopolymers represent promising multifunctional materials that integrate high mechanical performance with efficient and reusable dye adsorption for sustainable wastewater treatment applications.

Source: RSC Advances

DOI: 10.1039/d6ra07821d