Nickel retention by calcium silicate hydrate phases: Evaluation of the role of the Ca/Si ratio on adsorption and precipitation processes

The objective of the present study is to investigate Ni retention processes in Calcium Silicate Hydrate (CSH) phases, as the main cement hydration products, and to describe them in a generalized form for the first time. In particular, the effects of the CSH Ca/Si ratio (from 0.8 to 1.6) on the equil...

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Bibliographic Details
Published in:Applied geochemistry 2022-02, Vol.137, p.105197, Article 105197
Main Authors: Missana, Tiziana, García-Gutiérrez, Miguel, Alonso, Ursula, Almendros-Ginestá, Oscar
Format: Article
Language:English
Subjects:
Adsorption
Radioactive waste
Surface complexation modelling
Surface precipitation
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Summary:The objective of the present study is to investigate Ni retention processes in Calcium Silicate Hydrate (CSH) phases, as the main cement hydration products, and to describe them in a generalized form for the first time. In particular, the effects of the CSH Ca/Si ratio (from 0.8 to 1.6) on the equilibrium water chemistry, Ni speciation, adsorption and solubility have been addressed. Nickel adsorption tends to decrease as the Ca/Si ratio increases, especially when Ca/Si is 
ISSN:0883-2927
1872-9134
DOI:10.1016/j.apgeochem.2022.105197