Passivation of the calcite surface with malonate ion

Add time:08/24/2019    Source:sciencedirect.com

Samples of polycrystalline calcite were impregnated with solutions of malonic acid of three concentrations (5×10−2, 5×10−3, and 5×10−4 M) and different pH values (6.00, 7.00, and 8.00). The impregnation was carried out at room temperature to evaluate the adsorption of malonate ion in the calcite surface to optimize the conditions for possible application on limestone and marble in cultural heritage materials. The affinity of the malonate ion was determined through the potentiometric measurement of the surface charge and the corresponding adsorbed amounts by titration, Raman spectroscopy, and small-angle X-ray scattering (SAXS). The results indicate effective adsorption of the malonate ion on the surface at a pH value close to the point of zero charge (pHpzc≈8.20) and changes in some surface morphological properties such as the pore shape and the pore size distribution. The presence of a malonate adsorptive layer on calcite generates an interface interaction potential that may influence the reaction and transport mechanisms within the medium.

We also recommend Trading Suppliers and Manufacturers of CALCIUM MALONATE (cas 19455-76-6). Pls Click Website Link as below: cas 19455-76-6 suppliers

Prev:Spectroscopic studies of gel-grown lanthanum malonate crystals
Next:Heterogeneous Jørgensen–Hayashi catalyst for asymmetric Michael addition of malonates to α,β-enals. Cooperative effect with Ca(OTf)2)