Work

Prussian blue functionalized MIL-101(Cr)-SO3H for Cs+ ion capture for the management of contaminated water

Year: 2025

Type: article

Abstract: This study investigates the property of Metal-Organic Frameworks (MOFs) grafted with Prussian blue analogs (PBA) for the efficient removal of Cs + ions from aqueous solutions. MIL-101(Cr)-SO 3 H-PBA material was synthesized using a two-step process: hydrothermal reaction between monosodium 2-sulfoterephthalic acid (BDC-SO 3 Na) and chromium oxide (CrO 3 ) to produce MIL-101(Cr)-SO 3 H, followed by grafting with CuK 2 [Fe(CN) 6 ] (PBA). Both materials were characterized using XRD, IR, N 2 sorption and Raman spectroscopy. The results confirmed the conservation of MOF porosity after functionalization and the successful incorporation of PBA. Batch adsorption experiments were conducted to evaluate Cs + removal performance of the adsorbents. The study examined contact time (up to 1440 min), pH (2, 7 and 11), initial Cs + concentration (from 9 ppb to 1800 ppm) and competing ions. The resistance of the porous solids under drastic conditions involving gamma radiation (from 0.5 MGy up to10 MGy) was also investigated. MI-101(Cr)-SO 3 H-PBA exhibited a maximum Cs + adsorption capacity of 242 mg.g MOF -1 , compared to 161 mg.g MOF -1 for pristine MIL-101(Cr)-SO 3 H and showed high selectivity toward Cs + in the presence of competing ions (Na + , K + , Mg 2+ , Ca 2+ , Sr 2+ ). MI-101(Cr)-SO 3 H-PBA also demonstrates remarkable stability under radiation and alkaline conditions, maintaining 95% efficiency, whereas the performance of pristine MIL-101(Cr)-SO 3 H material decreased significantly (7.5-fold decrease).

Source: Microporous and Mesoporous Materials

DOI: 10.1016/j.micromeso.2025.113902