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The Preparation of Phosphazene Crosslinked Cyclen Microspheres as Host for Cu2+ Ions and Their Utilization as a Support Material for the Preparation of a Copper Nanocatalyst

Authors
  • Sahin, Ozdem1
  • Koc, Omer Kaan1
  • Ozay, Hava1
  • Ozay, Ozgur2
  • 1 Canakkale Onsekiz Mart University, Department of Chemistry, Laboratory of Inorganic Material, Faculty of Science and Arts, Canakkale, 17100, Turkey , Canakkale (Turkey)
  • 2 Canakkale Onsekiz Mart University, Department of Chemistry and Chemical Processing Technologies, Lapseki Vocational School, Lapseki, Canakkale, 17800, Turkey , Canakkale (Turkey)
Type
Published Article
Journal
Journal of Inorganic and Organometallic Polymers and Materials
Publisher
Springer-Verlag
Publication Date
Oct 01, 2016
Volume
27
Issue
1
Pages
122–130
Identifiers
DOI: 10.1007/s10904-016-0453-0
Source
Springer Nature
Keywords
License
Yellow

Abstract

In this study firstly, phosphazene crosslinked cyclen microspheres were synthesized. Then, supported copper nanoparticles were prepared on these phosphazene crosslinked cyclen microspheres for use as a metal catalyst. The prepared microparticles and microparticle-supported metal catalyst were characterized using FT-IR, SEM-EDX, TEM and XPS analysis. Also, the prepared metal composite was used as a catalyst for the reduction reaction of 4-nitrophenol in the presence of NaBH4 in aqueous media. The catalytic activity of the Cu-cyclen composite catalyst was investigated using UV–Vis spectroscopy. The reduction studies were completed at four different temperatures (30–60 °C). The activation parameters were calculated from the obtained rate constants at the four different temperatures (30–60 °C). The activation energy, activation enthalpy and activation entropy for the reduction reaction of 4-NP in the presence of Cu-cyclen composite catalyst were calculated as 39.88, 36.56 and −143.30 kJmol−1, respectively. The total turnover frequency (TOF) for Cu-cyclen composite catalyst was 0.794 mol 4-NP (mol Cu)−1 (min)−1.

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