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

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• 作者：Ozdem Sahin ; Omer Kaan Koc ; Hava Ozay…
• 关键词：Phosphazene microsphere ; Cyclen ; Metal catalyst ; 4 ; Nitrophenol ; Catalytic reduction
• 刊名：Journal of Inorganic and Organometallic Polymers and Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：27
• 期：1
• 页码：122-130
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Inorganic Chemistry; Organic Chemistry; Polymer Sciences;
• 出版者：Springer US
• ISSN：1574-1451
• 卷排序：27

文摘

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.