The Effect of pH, Ionic Strength and the Presence of PbII on the Formation of Calcium Carbonate from Homogenous Alkaline Solutions at Room Temperature

Abstract

Precipitation of calcium carbonates in aqueous systems is an important factor controlling various industrial, biological, and geological processes. In the first part of this study, the well-known titration approach introduced by Gebauer and coworkers in 2008 s used to obtain reliable experimental dataset for the deep understanding of CaCO3 nucleation kinetics in supersaturated solutions over a broad range of pH and ionic strength conditions. In the second part, the effect of impurities, i.e., 1 mol% of Pb2+, was assessed in the same range of experimental conditions. Divalent lead has been shown to have an inhibitory effect in all ranges of the conditions tested except for pH 8 and low ionic strength (≤0.15 mol/L). Future investigations might take advantage of the methodology and the data provided in this work to investigate the effect of other system variables. The investigation of all the major variables and the assessment of eventual synergic effects could improve our ability to predict the formation of CaCO3 in complex natural systems.

Macro-Calcium Carbonate-Hydrogel Hybrid Spheroids: Design and Biomedical Applications

“…When synthesizing small particles, it is necessary to slow down the movement of ions in the solution . As many crystallization centers are formed, and therefore, when synthesizing small particles, very dense media are used, such as gelatin hydrogels and glycerin. , For this reason, many factors such as temperature, , agitation way, pH, , viscosity and solubility via changing media, ,,− additional ions and molecules, − time, speed, etc. can influence reaction rate as a result to the particles size and shape.…”