Calcium carbonate formation on mica supported extracellular polymeric substance produced by Rhodococcus opacus

The synthesis of polyaspartic acid derivative PASP-Im and investigation of its scale inhibition performance and mechanism in industrial circulating water

“…32 Aer the introduction of the PASP-Im scale inhibitor, new peaks assigned to the N-C]O group of amide emerge at 288.01 eV and 288.18 eV (Fig. 9b and c), 35,36 possibly due to the adsorption of the scale inhibitor on the calcite surface. Besides, aer the addition of 30 mg L À1 PASP-Im, the C 1s peak assigned to N-C]O becomes much stronger than the same C 1s peak aer the addition of 10 mg L À1 PASP-Im, which implies that the increase in the scale inhibitor concentration might be favorable for its adsorption on the calcite surface.…”

“…All the O and N atoms of PASP-Im have a high degree of a negative charge, which means that PASP-Im can provide Ca 2+ with a large amount of binding sites. [35][36][37][38][39] As a result, the N and O atoms in the molecular structure of PASP-Im can be well bound to Ca 2+ ion, thereby inhibiting the growth of calcium carbonate crystals as well as the formation of calcium carbonate scales.…”

Nano-Montmorillonite Regulated Crystallization of Hierarchical Strontium Carbonate in a Microbial Mineralization System

“…The main reason for the decrease in conductivity is attributed to the sufficient contact reaction between Sr 2+ and CO 3 2− in the mineralized solution. In addition, there is a strong interaction between the Sr 2+ cation and the organic macromolecule, neutralizing the charged surface of the macromolecule [32]. Eventually, the molecules form agglomerates, or the metal chelate compound Sr 2+ is formed to slow the change in the conductivity of the solution.…”

Mineralization Mechanism of Mineralization Bacteria on Strontium Crystallization of Simulated Radionuclides

“…The carboxyl group of the extracellular polymer substance (EPS) in the secretion solution is ionized into COO − to make the molecule negatively charged. [30][31][32] The Sr 2+ neutralizes macromolecules with negative charges on the surface, causing macromolecules to flocculate into agglomerates. The charged organic groups in the system hinder the mutual migration and collision between the inorganic ions, which leads to a decrease in the ion binding rate at the initial stage of crystallization, thereby suppressing the initial nucleation of the crystal.…”