Chloride Adsorption on EDTA Intercalated MnFe-LDHs: Characterization, Performance, and Application

• Published in: Advances in materials science and engineering Vol. 2022; pp. 1 - 11
• Main Author: Han, Xue
• Format: Journal Article
• Language: English
• Published: New York Hindawi 09.12.2022; Hindawi Limited; Wiley
• Subjects: Adsorption; Aqueous solutions; Cement; Chloride; Concrete; Corrosion; Corrosion inhibitors; Equilibrium; Erosion resistance; Ethylenediamine; Ethylenediaminetetraacetic acids; Experiments; Hydroxides; Ion exchange; Manganese; Mathematical functions; Reagents; China; Japan
• ISSN: 1687-8434; 1687-8442
• DOI: 10.1155/2022/5375810

Ethylenediamine tetraacetate-intercalated Fe-Mn layered double hydroxides (MnFe-EDTA-LDHs) were prepared by coprecipitation. The influence of different factors on Cl− adsorption by MnFe-EDTA-LDHs was investigated. Additionally, MnFe-EDTA-LDHs were incorporated into the concrete to study the Cl− erosion properties. The result showed that the Cl− adsorption on MnFe-EDTA-LDHs was affected by the initial pH, dosage, and coexisting anions. The Cl− adsorption process by MnFe-EDTA-LDHs accorded with the pseudo-second-order model and the Redlich–Peterson model. The maximum adsorption capacity of Cl− on MnFe-EDTA-LDHs reached 129.50 mg/g. The adsorption mechanism involved the complexation of O-containing groups, ion exchange, and electrostatic interaction. Moderate additions of MnFe-EDTA-LDHs improved the resistance of the concrete to Cl− erosion, while excessive additions reduced the Cl− erosion resistance. This work indicated that MnFe-EDTA-LDHs effectively retarded the Cl− erosion on concrete.