Efficient removal of U(VI) from solution using a MoS42− ion-exchange functionalized polypyrrole composite material

Abstract

MoS₄–Ppy was synthesized by a simple oxidative polymerization method and functionalized with the MoS₄²⁻ ions. Because of the good stability and excellent ion-exchange properties, it has been considered as one of the promising candidates for metal ions adsorption. In this regard, the as-prepared MoS₄–Ppy was used to remove U(VI) and well characterized by XRD, TEM, FT-IR, and XPS techniques. The batch adsorption experiments were systematically studied. It was found that the adsorption of U(VI) on MoS₄–Ppy largely depends on the solution pH; the maximum adsorption capacity of MoS₄–Ppy was determined to be 333.9 mg/g. Impressively, MoS₄–Ppy showed excellent selectivity toward U(VI). The adsorption mechanism indicated that U(VI) mainly depends on the electrostatic interaction of MoS₄²⁻ on the surface of MoS₄–Ppy. And comprehensive experimental results show that MoS₄–Ppy is highly stable under acid conditions, which can effectively remove radionuclides from wastewater.