CeO2/La2O2CO3 heterostructures as high-performance adsorbents: Interfacial synergy and regeneration for fluoride removal

Excessive fluoride ions in aquatic environments pose serious threats to ecosystems and human health, highlighting the urgent need for efficient adsorption materials. In this study, a 0.2CeO 2 /La 2 O 2 CO 3 composite was synthesized via a hydrothermal‑calcination method for deep fluoride removal, achieving a maximum adsorption capacity of 56.18 mg/g, which surpasses those of its individual constituents. Comprehensive characterization and theoretical calculations reveal that the adsorption mechanism is attributed to the combined action of ion exchange forming CeF 3 /LaF 3 accompanied by Ce 4 ⁺ reduction, electron‑relay synergy of dual‑metal sites (Ce 3 ⁺/La 3 ⁺) at the heterointerface, as well as electrostatic attraction and surface complexation. This multi‑pathway synergy not only enhances the adsorption capacity but also ensures high selectivity and good regenerability. This study provides a theoretical basis and a practical strategy for the design of highly selective fluoride removal materials. Download: Download high-res image (264KB) Download: Download full-size image