Magnesium Hydroxide Nanoparticles Production from Natural Bitterns
Battaglia, Giuseppe
Domina, Maria Alda
Romano, Salvatore
Tamburini, Alessandro
Cipollina, Andrea
Micale, Giorgio

How to Cite

Battaglia G., Domina M.A., Romano S., Tamburini A., Cipollina A., Micale G., 2022, Magnesium Hydroxide Nanoparticles Production from Natural Bitterns, Chemical Engineering Transactions, 96, 43-48.


Magnesium hydroxide nanoparticles are widely employed in numerous industrial applications. Several preparation methods have been proposed using mainly synthetic Mg2+ containing solutions. In the present work, the possibility of producing Mg(OH)2 nanoparticles from real bitterns, the by-product of sea salt production, is investigated. Bitterns are highly concentrated Mg2+ containing solutions whose exploitation can turn a waste into valuable products embracing the circular economy idea. Two bitterns collected from Galia and Margi saltworks of the district of Trapani (Italy) were studied. Galia and Margi bitterns had a 1 M and 2.5 M Mg2+ concentration, respectively. A 2 mm diameter circular-cross sectional T-mixer was adopted to ensure fast reactant mixing. NaOH solutions were employed as precipitant agents. Mg(OH)2 nanoparticles characterized by cationic and mass purity higher than 99 % and 90 %, respectively, were successfully produced when treating Galia bitterns, while the excessive Margi Mg2+ concentration yielded stronger micrometer Mg(OH)2 agglomerates.