β-Cyclodextrin polymer networks stabilized gold nanoparticle with superior catalytic activities

• 作者: Yong Zhang Bing Hu Xiao-Mei Cao Liang Luo Yu Xiong Zhi-Peng Wang Xin Hong San-Yuan Ding
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: Research Articles
• 页码范围: 1018-1025
• 页数: 8页
• 语种: 英文

摘要

Support materials play a significant role in heterogeneous nanocatalysis.In this work,β-cyclodextrin (β-CD) was used directly as a monomer to construct polymer networks for gold nanoparticles (Au NPs) immobilization.Using the simple nucleophilic substitution reaction,β-CD based polymer networks (β-CDP-N and β-CDP-C) were successfully prepared.Compared to β-CDP-C,the hydroxyl groups and N atoms in β-CDP-N played a synergistic role in immobilizing smaller Au NPs,thus leading to high catalytic activities.Notably,the apparent rate constant (Kapp) value for Au@β-CDP-N in the reduction of 4-nitrophenol to 4-aminophenol is 14.15 × 10-2 s-1,which shows a significant improvement over all previously reported Au NPs with solid supports under similar conditions.Considering the negligible porosity of the β-CDP-N support,we purposed a "capture-catalysis-release" model to explain the high catalytic activity of Au@,β-CDP-N.This explanation is supported by the guest-responsive properties of β-CDP-N.Moreover,the Au@,β-CDP-N is easily recycled and maintained its high catalytic efficiency after seven successful cycles.