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

SAHIN O., KOC O. K., ÖZAY H., ÖZAY Ö.

JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, vol.27, no.1, pp.122-130, 2017 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 27 Issue: 1
  • Publication Date: 2017
  • Doi Number: 10.1007/s10904-016-0453-0
  • Journal Name: JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.122-130
  • Keywords: Phosphazene microsphere, Cyclen, Metal catalyst, 4-Nitrophenol, Catalytic reduction, REDUCED GRAPHENE OXIDE, CATALYTIC-REDUCTION, SILVER NANOPARTICLES, GREEN SYNTHESIS, 4-NITROPHENOL REDUCTION, PHOSPHORUS DENDRIMER, HIGHLY EFFICIENT, FE3+ IONS, POLYPHOSPHAZENES, NITROPHENOLS
  • Çanakkale Onsekiz Mart University Affiliated: Yes

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 A degrees C). The activation parameters were calculated from the obtained rate constants at the four different temperatures (30-60 A degrees 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).