Immobilization of erosion ions in seawater by Fe-Al bimetallic hydroxide

• Published in: Digest Journal of Nanomaterials and Biostructures 2022-10, Vol.17 (4), p.1099-1109
• Main Authors: Fu, C. H., Ge, Y. M., Zhan, Q. W., Wang, A. H., Zhou, J. L., Pan, Z. H. H.
• Format: Article
• Language: English
• ISSN: 1842-3582; 1842-3582
• DOI: 10.15251/DJNB.2022.174.1099

Immobilization of erosion ions in seawater by Fe-Al bimetallic hydroxide was systematically analyzed. Firstly, Fe-Al bimetallic hydroxide was synthesized in the simulated solution of marine concrete crack area, and immobilization of chloride ion and sulfate ion was studied. The treatment effects of chloride ion and sulfate ion were obviously different, indicating that it had selectivity for ion immobilization. Secondly, immobilization of hydroxyl ion by bimetallic hydroxide was also demonstrated according to the high alkali environment in marine concrete crack area. The pH value of simulated solution decreased significantly, and the more solid products, the greater the decrease. Finally, microstructure and composition of Fe-Al bimetallic hydroxide was studied by SEM and EDS. The crystal presented spherical and spherical accumulation, which provided a natural place for immobilization of erosion ions. In addition to Fe, Al C, O, Na and Mg, chlorine and sulfur were found in Fe-Al bimetallic hydroxides. The simulated solution treated by Fe-Al bimetallic hydroxides was studied by FTIR. Erosion ions entered the interlayer structure of Fe-Al bimetallic hydroxide through ion exchange, while lactate ions were replaced into simulated solution. The results provided a new idea for improving the repair effect of concrete crack based on microbial mineralization.