Influence of the chemical prehistory of the sorbent-mineralizer on the process of its carbonization in aqueous environments

Abstract

The ability of a sorbent-mineralizer to irreversibly bind carbon dioxide in both fresh and sea water by forming chemically and thermally stable carbonate structural forms based on melilite Ca2[Al2Mg,Si]Si2O7 has been discovered. The influence of the chemical prehistory of the sorbent-mineralizer on the process of its carbonization in aqueous media has been revealed. It has been shown that the CO32– groups in the composition of the original sorbent-mineralizer are the primary active centers in the surface phase formation of carbonized calcium and magnesium aluminosilicates in aqueous media. It has been established that the thermal stability of the struc-ture of carbonized calcium and magnesium aluminosilicates is retained after heating to 1000 °C. The formation of carbonized calcium and magnesium hydroaluminosilicates in sea water is ac-companied by an increase in pH, which characterizes the ability of the sorbent-mineralizer to regulate the acid-base balance and maintain the carbonate balance in the hydrosphere. In addition to irreversible binding of CO2, in sea water the sorbent-mineralizer exhibits the ability to irreversibly adsorb the impurity cations, such as Pb2+, Cu2+, Zn2+, as well as phosphorus.