Aluminum Metal–Organic Framework–Silver Nanoparticle Composites for Catalytic Reduction of Nitrophenols
Guifang Liu, Xingxing Qiao, Yong–Li Cai, Jianying Xu, Yong Yan, Bahar Karadeniz, Jian Lü, Rong Cao
Abstract
Ultrafine silver (Ag) nanoparticles (NPs) were successfully loaded on a robust aluminum (Al) metal–organic framework (MOF), NOTT-300(Al), by means of a double-solvent method (DSM), and the construction of Ag@NOTT-300(Al) composites led to a highly efficient catalytic reduction of nitrophenols in these hybrid systems. Of note, the catalytic activity of Ag@NOTT-300(Al) was used as a heterogeneous catalyst for the reduction of 4-nitrophenol (4-NP) with a reaction rate constant (k) of 2.67 min–1 and activation energy (Ea) of ca. 29.7 kJ mol–1. Kinetics and thermodynamics of catalytic 4-NP reduction in this current system complied with the Langmuir–Hinshelwood mechanism. Moreover, the combined use of ultrafine Ag0 NPs and porous NOTT-300(Al) supports favored reactants diffusion while accelerating the reduction of 4-NP.