Rational design an amorphous multifunctional δ-MnO2@Fe/Mg-MIL-88B nanocomposites with tailored components for efficient and rapid removal of arsenic in water

Abstract

Compounding a single component with a specific function into a composite material that can fully exert synergy effects according to demand is the key to achieving the expected function and expanding emerging applications. Herein, anchoring δ-MnO2 with strong oxidizing ability on the surface of Fe/Mg-MIL-88B with superior uptake ability for As(V) to form an amorphous nanocomposite with multiple functions for removing more toxic As(III). Due to special construction and rational design, the fabricated nanocomposite demonstrated an excellent As(III) removal performance over a very broad pH range of 3 to 10. Impressively, the adsorption efficiency of the obtained δ-MnO2@Fe/Mg-MIL-88B on As(III) is greatly improved, and the maximum adsorption capacity under laboratory conditions is as high as 221.04 mg/g in room temperature. Notably, the residual concentration of arsenic will drop below 10 μg/L, as long as the initial As(III) concentration is not higher than10 mg/L, which is very critical for further promotion. In general, the δ-MnO2@Fe/Mg-MIL-88B exhibits excellent promise in removing As(III) from sewage, and its applicability in practical complex water treatment deserves further study.