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Effects of adding zeolite particles on the hierarchical microstructure of zeolite-geopolymer composites and their Sr2+ adsorption properties.

Authors :
Vannier, Samuel
Gossard, Alban
Magnier, Lucile
Proust, Vanessa
David, Thomas
Grandjean, Agnès
Source :
Materials & Design. Aug2024, Vol. 244, pN.PAG-N.PAG. 1p.
Publication Year :
2024

Abstract

[Display omitted] • Zeolite-in-geopolymers were investigated for nuclear wastewater decontamination. • Increasing the zeolite content strongly affects the porous and solid microstructure. • Increasing zeolite content slows down adsorption kinetics, but increases capacity. • Large zeolite particle clusters reduces the fixed-bed efficiency of the materials. Strontium ions can be removed from wastewater in fixed-bed reactors by adsorption on hierarchical materials (different pore sizes and phases). A detailed understanding of the materials multiscale structure is therefore crucial to optimize their sorption properties. This article presents a multi-technique approach developed to characterize the relationship between microstructure and adsorption in a range of Linde-type A (LTA) zeolite-geopolymer composites,. Two-dimensional scanning electron microscopy and 3D X-ray tomography were used to image the porous and solid phases at different length scales. Advanced numerical methods involving machine learning were applied to segment the images and provide quantitative morphological values describing the porous network geometry and the location and accessibility of the zeolite particles in the geopolymer. These results were then correlated with the materials sorption properties, measured in batch and column processes. Increasing the materials zeolite content (from 0 to 27 wt%) slowed down their adsorption kinetics but increased their maximal adsorption capacities from 20 to 49 mg.g−1 and Sr2+-selectivity at equilibrium. In breakthrough experiments, the material with highest zeolite content had a much higher breakthrough volume passing from 169 to 478 ml in the presented experimental conditions (much higher wastewater decontamination capacity), but a shallower breakthrough curve (lower column efficiency). [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
02641275
Volume :
244
Database :
Academic Search Index
Journal :
Materials & Design
Publication Type :
Academic Journal
Accession number :
179234767
Full Text :
https://doi.org/10.1016/j.matdes.2024.113233