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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Published in:Applied geochemistry 2022-02, Vol.137, p.105197, Article 105197
Main Authors: Missana, Tiziana, García-Gutiérrez, Miguel, Alonso, Ursula, Almendros-Ginestá, Oscar
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Language:English
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Adsorption
Radioactive waste
Surface complexation modelling
Surface precipitation
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description 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 
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Nickel retention on the CSH phases was analysed and interpreted with the help of surface complexation modelling using an electrostatic double layer approach and accounting for the major species present in solution for each CSH. The uncertainties in the available Ni thermodynamic database under alkaline conditions and in the presence of Si are underlined. [Display omitted] •The Ca/Si ratio is relevant on Ni adsorption if Ca/Si &lt; 1.2.•Both cationic and anionic Ni species are adsorbed at the CSH surface.•Retention of Ni by CSH at different Ca/Si has been described in a generalized form.•A greater presence of Si decreases the overall Ni solubility.</abstract><pub>Elsevier Ltd</pub><doi>10.1016/j.apgeochem.2022.105197</doi><orcidid>https://orcid.org/0000-0002-2668-4725</orcidid><orcidid>https://orcid.org/0000-0001-6551-2873</orcidid><orcidid>https://orcid.org/0000-0003-3052-5185</orcidid></addata></record>
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subjects Adsorption
Radioactive waste
Surface complexation modelling
Surface precipitation
title Nickel retention by calcium silicate hydrate phases: Evaluation of the role of the Ca/Si ratio on adsorption and precipitation processes
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