Abstract
Prussian blue analogues (PBAs) have received much attention as materials for radioactive Cs removal due to their affinity for adsorbing Cs+. In this study, we have synthesized PBAs using Ni(II), Co(II), and Fe(II) to prepare NiFe-PBA, CoFe-PBA, and FeFe-PBA and have added different quantities of sodium citrate as a stabilizing agent to adjust particle size and surface area. The PBAs also were composited with TiO2, and the efficiency of Cs+ adsorption was compared in the dark and under UV-light irradiation. Larger surface areas and smaller particle sizes yield better Cs+ adsorption with NiFe-PBA, NiFe-TiO2. FeFe-TiO2 exhibits enhanced Cs+ adsorption under UV irradiation. The adsorption capacity of NiFe-PBA more than doubles from ~0.8 mmol·g−1 in the dark to 1.7 mmol·g−1 under UV light. The adsorption capacity of the NiFe-TiO2 composite approximately triples from 0.45 mmol·g−1 in the dark to 1.5 mmol·g−1 under UV irradiation. Enhanced photoinduced adsorption on NiFe PBAs also is observed with radioactive 137Cs+. The enhancement of Cs+ adsorption by NiFe PBAs is the result of a photoinduced charge transfer reaction within the NiFe PBA structure. This study is the first report of enhanced photoinduced removal of Cs+ using PBAs, which is an attractive strategy for the removal of the radioactive Cs+ from contaminated water.
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