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M: XNi100- X (M = Ag, and Co) nanoparticles supported on CeO2 nanorods derived from Ce-metal organic frameworks as an effective catalyst for reduction of organic pollutants: Langmuir-Hinshelwood kinetics and mechanism

Kohantorabi, M ; Sharif University of Technology | 2017

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  1. Type of Document: Article
  2. DOI: 10.1039/c7nj03009f
  3. Publisher: Royal Society of Chemistry , 2017
  4. Abstract:
  5. In this study, AgxNi100-x, and CoxNi100-x (x = 0, 20, 40, 60, 80, and 100) bimetallic nanoparticles were successfully decorated on the surface of CeO2 nanorods derived from Ce-metal organic frameworks (Ce-MOF). The as-synthesized products were characterized using different techniques including XRD, FE-SEM, EDX, TEM, ICP, and BET. The as-prepared nanocomposites showed remarkable catalytic activity towards the reduction of organic pollutants such as 4-nitrophenol (4-NP), and rhodamine-B dye (RhB) by NaBH4 solution, with high stability and reusability for five consecutive cycles. The obtained results indicated that among these nanocomposites, Ag80Ni20@CeO2, and Co60Ni40@CeO2 exhibited the best catalytic performance, with high turn over frequency. The adsorption equilibrium constants of borohydride, and 4-nitrophenol (K4-NP) were determined by the Langmuir-Hinshelwood model, and the reaction mechanism was investigated in detail. The thermodynamic parameters including energy of activation, activation enthalpy, entropy, and Gibbs free energy were calculated, and discussed. © 2017 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique
  6. Keywords:
  7. 4 nitrophenol ; Cerium ; Cobalt ; Metal organic framework ; Nanocomposite ; Nanorod ; Rhodamine B ; Silver nanoparticle ; Adsorption ; Article ; Catalytic efficiency ; Chemical reaction kinetics ; Desorption ; Enthalpy ; Entropy ; Equilibrium constant ; Kinetics ; Nanocatalyst ; Pollutant ; Priority journal ; Reaction analysis ; Reduction (chemistry) ; Surface area ; Surface charge
  8. Source: New Journal of Chemistry ; Volume 41, Issue 19 , 2017 , Pages 10948-10958 ; 11440546 (ISSN)
  9. URL: https://pubs.rsc.org/en/content/articlelanding/2017/nj/c7nj03009f#!divAbstract