Ag nanoparticles decorated on Co3O4‐C derived from ZIF‐67: a recyclable catalyst for highly efficient reduction of nitrophenols

催化作用 水溶液 反应速率常数 纳米颗粒 纳米复合材料 核化学 还原剂 银纳米粒子 金属 化学 材料科学 无机化学 纳米技术 动力学 有机化学 物理 量子力学
作者
Meili Ding,B. A. Yukuai Tang,Bo Liang,Bin Chen,Shuai Zhou,Fengyan Han
出处
期刊:ChemistrySelect [Wiley]
卷期号:9 (1)
标识
DOI:10.1002/slct.202303435
摘要

Abstract Silver‐based nanostructured composites as effective and stable catalysts were successfully designed as the catalyst to reduce the nitrophenols in aqueous solution at room temperature in the presence of NaBH 4 . The Co 3 O 4 ‐C composites with regular morphology and adjustable components derived from ZIF‐67 in an air atmosphere at various temperatures (270, 300, and 350 °C) were chosen as a favorable platform to support silver nanoparticles. The acquired silver‐based nanocatalyst (Ag/Co 3 O 4 ‐C) exhibited excellent catalytic performance towards the hydrogenation of nitrophenols (2‐NP, 3‐NP, and 4‐NP). The calculated rate constant (K app ) towards the reduction of 4‐NP followed the order: Ag/Co 3 O 4 ‐C‐300 (0.70 min −1 )>Ag/Co 3 O 4 ‐C‐270 (0.58 min −1 )>Ag/Co 3 O 4 ‐C‐350 (0.46 min −1 ). Ag/Co 3 O 4 ‐C‐300 possessed the highest catalytic activity with no induction time during the reaction. What is more, Ag/Co 3 O 4 ‐C‐300 could reduce 2‐NP and 3‐NP with the rate constant of 0.936 min −1 and 0.391 min −1 , respectively. The catalytic activity was higher that many other metal‐based nanocomposites. The excellent catalytic performance was mainly attributed to the abundant active sites on the surface, and the interfacial synergistic effect between Ag and Co 3 O 4 ‐C, which had a potential driving force for the hydrogenation reaction. In addition, the catalyst remained active even after recirculation experiments. The Ag‐based nanocomposites can be expected to be applied in industrial applications.
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