Izvorni znanstveni članak

https://doi.org/10.5562/cca4098

Synergistic Effect of Additives in CaCO3 Precipitation System at Different Initial pH

Iva Vojtkuf orcid.org/0009-0004-5013-2025 ; Faculty of Science, University of Zagreb, Horvatovac 102a, 10000, Zagreb, Croatia
Marko Andrašić orcid.org/0009-0006-3743-6854 ; J. J. Strossmayer University of Osijek, Department of Chemistry, Ulica Cara Hadrijana 8a, 31000, Osijek, Croatia
Damir Kralj orcid.org/0000-0002-4152-4893 ; Ruđer Bošković Institute, Laboratory for Precipitation Processes, Division of Materials Chemistry, Bijenička cesta 54, 10000, Zagreb, Croatia
Jasminka Kontrec orcid.org/0000-0002-8960-8201 ; Ruđer Bošković Institute, Laboratory for Precipitation Processes, Division of Materials Chemistry, Bijenička cesta 54, 10000, Zagreb, Croatia *
Branka Njegić Džakula orcid.org/0000-0002-3003-0695 ; Ruđer Bošković Institute, Laboratory for Precipitation Processes, Division of Materials Chemistry, Bijenička cesta 54, 10000, Zagreb, Croatia *

* Dopisni autor.

Sažetak

In this study, the synergistic effect of magnesium ions (Mg2+) and poly-L-aspartic acid (pAsp), at different initial pH (pHi), on the spontaneous precipitation of calcium carbonate (CaCO3), as a model precipitation system for investigating biomineralization in marine organisms, was investigated. The research was conducted in systems with pHi from 8.3 to 10.5, molar ratio n(Mg2+) : n(Ca2+) = 1 : 5 and pAsp concentration from 1–5 ppm. By comparing synergistic systems with the model system as well as with systems where Mg2+ or pAsp were individually added, it was observed that as a consequence of the synergistic effect of Mg2+ and pAsp in the entire investigated pHi range enhanced inhibition of CaCO3 precipitation process occured as well as the change in: polymorphic composition of precipitated CaCO3 and morphology of individual polymorphs. Inhibition of precipitation was intensified with the increase in pHi, and regarding the polymorphic composition of the precipitate pAsp played a crucial role at lower pHi while Mg2+ was decisive at higher pHi. These results clearly indicate the significance of pHi in the synergistic effect of Mg2+ and pAsp.

Ključne riječi

calcium carbonate; poly-L-aspartic acid; magnesium; synergy; pH; calcite; vaterite; aragonite; climate change

Hrčak ID:

326019

URI

https://hrcak.srce.hr/326019

Datum izdavanja:

31.12.2024.

Posjeta: 219 *