Bimetallic AgCu nanoparticles decorated on zeolitic imidazolate framework derived carbon: An extraordinarily active and recyclable nanocomposite catalyst for reduction of nitroarenes and degradation of organic dyes

Juti Rani Deka, Diganta Saikia, Tsun Hao Cheng, Hsien Ming Kao, Yung Chin Yang

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Zeolitic imidazolate framework-8 (ZIF-8) derived carbon (CZ-8) is explored as support to immobilize bimetallic AgCu nanoparticles (NPs) (denoted as AgCu@CZ-8) for the first time to be used as catalyst for reduction of nitroarenes and degradation of toxic dyes. A series of AgCu@CZ-8 with different Ag/Cu ratios is prepared by simultaneous chemical reduction of silver and copper nitrates in the presence of two reducing agents, i.e., NaBH4 and NH3BH3. Due to high surface area, presence of N atoms in the framework, modified electronic structure of AgCu caused by alloy formation and synergistic effects, the catalytic activities of bimetallic AgCu@CZ-8 nanocomposites are much higher than monometallic counterparts Ag@CZ-8 and Cu@CZ-8 for reduction of 4-nitrophenol (4-NP), and degradation of methyl orange (MO) and rhodamine B (RhB). Ag6Cu4 @CZ-8 exhibits a superb reaction rate of 12.93 min-1 and outstanding activity of 581880 min-1gcat -1 for reduction of 4-NP to 4-aminophenol (4-AP). On the other hand, Ag2Cu8 @CZ-8 delivers outstanding rate constants of 12.9 and 20.73 min-1 for degradations of MO and RhB, respectively. The catalyst shows excellent stability and recyclability after reuse for 5 cycles. The results presented here demonstrate that the carbonized ZIF-8 can provide a unique platform for the growth of uniformly dispersed bimetallic NPs with high catalytic activity towards various catalytic reactions.

Original languageEnglish
Article number109777
JournalJournal of Environmental Chemical Engineering
Volume11
Issue number3
DOIs
StatePublished - Jun 2023

Keywords

  • Bimetallic AgCu
  • Carbonized ZIF-8
  • Degradation
  • Dyes
  • Nanocomposite
  • Nitroarenes

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