Polyoxometalate@MIL-101/MoS2: a composite material based on the MIL-101 platform with enhanced performances

Abstract

A composite was designed and synthesized based on MIL-101, MoS₂, and an iron-substituted polyoxometalate. MoS₂ and PW₁₁O₃₉Fe(H₂O)⁴⁻ (PW₁₁Fe) were introduced on the surface of MIL-101 and encapsulated in the cages of MIL-101, respectively. First, a facile microwave synthesis method was developed for synthesizing the composite MIL-101/MoS₂. Then, PW₁₁Fe clusters were diffused into the pores of MIL-101/MoS₂. The composite PW₁₁Fe@MIL-101/MoS₂ could rapidly adsorb rhodamine B (RhB). An adsorption capacity of 378 mg g⁻¹ was achieved in the first 5 min. Moreover, PW₁₁Fe@MIL-101/MoS₂ could be potentially used for the separation of dyes. Its RhB adsorption capacity at equilibrium was about four times higher than that of MIL-101. In contrast, its methyl orange (MO) adsorption capacity was about three times lower than that of MIL-101.