Preparation of copper (Ⅰ) based Prussian blue analogue composites derived from copper gallate for Cesium Removal

Addressing the urgent need to eliminate radioactive ¹³⁷Cs is hampered by the difficulty in developing Cs⁺ adsorbents with both high capacity and selectivity. In this work, a novel copper gallate (Cu-GA) based adsorbent, Cu-PBA(Cu-GA), was creatively synthesized, by leveraging the inherent Cs⁺ affinity of Prussian blue analogues (PBAs). XPS characterization revealed the presence of reduced Cu(Ⅰ) in the obtained material. This material achieved a dramatic increase in adsorption capacity to 412.9 mg·g⁻¹. Cu-PBA(Cu-GA) further exhibited fast kinetics (equilibrium ~ 7 min), faster than most reported PBAs, along with outstanding selectivity (K _d > 5×10 ⁴ mL·g⁻¹) in the presence of abundant interfering ions, and robust stability across a broad pH range. This work underscored the superior adsorption properties of Cu-PBA(Cu-GA), positioning it as a highly effective material for environmental Cs⁺ remediation.