Removal of Co²⁺ Ions in Aqueous Solution via Capacitive Deionization Using a TiO₂ Nanoparticle-Based Electrode.

ABSTRACT: Cobalt contamination from industrial and radioactive sources poses serious environmental and health risks. Conventional removal methods suffer from drawbacks, such as secondary waste generation, high costs, and poor selectivity. Here, we present a capacitive deionization (CDI) system using a TiO₂ nanoparticle-based electrode to utilize their abundant surface hydroxyl groups and strong capability for redox processes. In particular, to enhance the adsorption ability of the electrode, anodized TiO₂ nanoparticles was utilized as an active material of the electrode. The CDI system exhibited a clear trend of enhanced removal performance at higher applied voltage, near-neutral pH (5-7), and lower initial Co^{2 +} concentrations, achieving an excellent maxi

SUBMITTER: Kim J 

PROVIDER: S-EPMC12824960 | biostudies-literature | 2026 Jan

REPOSITORIES: biostudies-literature