Metal@MOF Materials in Electroanalysis: Silver-Enhanced Oxidation Reactivity Towards Nitrophenols Adsorbed into a Zinc Metal Organic Framework—Ag@MOF-5(Zn)

Dharmendra Kumar Yadav, Vellaichamy Ganesan, Frank Marken, Rupali Gupta, Piyush Kumar Sonkar

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

Classical Metal-Organic Frameworks (MOFs), although able to accumulate chemicals from solution, are usually electrochemically “inactive”. Here, it is demonstrated for the zinc-containing MOF-5(Zn) (and MOF-5W(Zn)) system, that silver incorporation (Ag@MOF-5(Zn), prepared via a solvothermal process) can be used to assist/promote release and electrochemical oxidation of accumulated nitrophenols (2-methyl-4-nitrophenol, 4-nitrophenol, and 2-nitrophenol). Nitrophenols belong to a group of compounds that are present in diesel exhaust and considered harmful pollutants. The enhanced electrochemical detection of nitrophenols at a glassy carbon electrode modified with Ag@MOF-5(Zn) is suggested to be due to analyte accumulation with estimated Langmuirian binding constants of 40 × 10 3  M −1 (for 2-methyl-4-nitrophenol and 4-nitrophenol) and 15 × 10 3  M −1 (for 2-nitrophenol) and electrochemical detection/conversion with a current enhancement of more than one order of magnitude due to potential driven release from Ag@MOF-5(Zn). Surface characterization and electrochemical techniques suggest that silver is present in Ag@MOF-5(Zn) in metallic form and probably also embedded into the framework. This silver incorporation changes the electrochemical oxidation behavior towards nitrophenols in MOF-5(Zn) from “inactive” to “active”. The new class of metal@MOF materials is highlighted as practical nano-composites.

Original languageEnglish
Pages (from-to)482-491
Number of pages10
JournalElectrochimica Acta
Volume219
Early online date4 Oct 2016
DOIs
Publication statusPublished - 20 Nov 2016

Keywords

  • electrocatalysis
  • environmental pollutant
  • microporosity
  • nitrophenol
  • promotor

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

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