Systematic effect of different external metals of hexacyanoferrates on cesium adsorption behavior and mechanism

This study aims to investigate Cs removal by different external metals hexacyanoferrates M II –Fe PBA (M II : Co, Ni and Cu). Three PBAs were synthesized, characterized and followed by batch experiment testing and model fitting. Among the three PBAs, Cu–Fe PBA possessed the highest capacity 234.28 mg g −1 , the highest K d 2.8 × 10 6  mL g −1 and the fastest adsorption kinetics on Cs removal. Moreover, Cu–Fe PBA and Ni–Fe PBA were the more selective sorbents in coexisting ions study. Finally, the adsorption mechanism was proposed. This study provides new insights into the vacancies effect of the PBA structure and Cs adsorption application.