Montmorillonite and amino acid composites for heavy metal ion adsorption.

ABSTRACT: This study explores the interactions between montmorillonite (MMT) and selected amino acids (lysine, arginine, serine, and aspartate), as well as their complexes with heavy metal ions. Multi-technique characterization (e.g., XRD, FT-IR, XPS, SEM, TEM, and ICP-MS) revealed that MMT exhibits high affinity for basic amino acids, with the adsorption capacity following the order: amino > carboxyl > hydroxyl. The adsorption kinetics of lysine were well described by pseudo-second-order, Elovich, and Weber-Morris models, indicating a chemically controlled, two-stage process involving initial surface diffusion and subsequent internal diffusion. In contrast to the adsorption of amino acids, that of Cu²⁺ exhibited a higher initial rate and greater adsorption energy. Furthermore, amino acid

SUBMITTER: Lyu Y 

PROVIDER: S-EPMC12796756 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature