β-Cyclodextrin polymer networks stabilized gold nanoparticle with superior catalytic activities
β-cyclodextrin polymer, Au nanoparticles, superior catalytic activity, 4-nitrophenol reduction
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.
Tsinghua University Press
Yong Zhang, Bing Hu, Xiao-Mei Cao, Liang Luo, Yu Xiong, Zhi-Peng Wang, Xin Hong, San-Yuan Ding. β-Cyclodextrin polymer networks stabilized gold nanoparticle with superior catalytic activities. Nano Research 2021, 14(4): 1018-1025.