Effective removal of 2,4,6‐trinitrophenol over hexagonal metal–organic framework NH₂‐MIL‐88B(Fe)

Abstract

A nanostructured organic–inorganic framework, hexagonal NH 2 ‐MIL‐88B, has been prepared through a facile one‐pot reflux reaction and then it was characterized using various techniques. The as‐prepared sample with high specific surface area (414 m 2 g −1 ) showed excellent adsorption for 2,4,6‐trinitrophenol (TNP) in the liquid phase. Detailed studies of the adsorption kinetics, adsorption mechanism, adsorption isotherm, activation energy and various thermodynamic parameters were conducted. The adsorption mechanism of NH 2 ‐MIL‐88B for TNP may be ascribed to hydrogen bond interaction, and the complexation between ─OH in TNP and unsaturated Fe(III) on the surface of NH 2 ‐MIL‐88B. The maximum adsorption capacity of NH 2 ‐MIL‐88B for TNP based on the Langmuir isotherm was 163.66 mg g −1 . The as‐prepared NH 2 ‐MIL‐88B adsorbent seems to be a promising material in practice for TNP removal from aqueous solution.