writer：Yuhua Mao , Hao Zhang , Saad Ahmed , Shanshan Li , Shouhao Zhang , Jianli Wang
keywords：Hybrid microgels, Catalytic membrane, Silver nanoparticles, Heterogeneous catalysis, 4-Nitrophenol
source：期刊
specific source：Applied Catalysis B: Environmental
Issue time：2022年

  在这项工作中，我们报道了一种由分散的银纳米颗粒(NPs)组成的新型高效催化膜(PES/PNM-Ag)。通过动态加载可膨胀的混合微凝胶PNM-Ag，可以直接构建成具有不对称结构的市售聚醚砜(PES)膜。PNM-Ag和PES/PNM-Ag的表征结果表明，通过膨胀微凝胶在膜孔中形成了嵌有Ag - NPs的纳米级三维网络。由PES/PNM-Ag组装的平板膜反应器能够高效、连续地催化4-硝基苯酚的还原(表观反应速率常数达到1.12 s^-1)，且具有良好的稳定性。催化活性的提高主要是由于Ag NPs的表面完全可达以及膜的独特结构，其中反应物在固定催化剂中流动受到限制。本文提出了设计其他负载贵金属NPs的催化膜以高效转化硝基芳香族污染物的策略建议。

In this work, we report a novel and highly efficient catalytic membrane (PES/PNM-Ag) comprising welldispersed silver nanoparticles (NPs). The membrane can be straightforwardly constructed via dynamic loading expansible hybrid microgels PNM-Ag into a commercially-available poly(ether sulfone) (PES) membrane with asymmetric structure. Characterization results of PNM-Ag and PES/PNM-Ag indicate that a nanoscale three-dimensional network embedded with Ag NPs was developed in membrane pores by swollen microgels. The flat-sheet membrane reactor assembled with PES/PNM-Ag can efficiently and continuously catalyze the reduction of 4-nitrophenol (apparent reaction rate constant reaching 1.12 s^-1 ) and showed good stability. The improved catalytic activity was attributed to fully accessible surface of Ag NPs as well as the unique structure of the membrane, in which the reactant was restricted to flow through immobilized catalyst. Present strategy hints to design other noble metal NPs loaded catalytic membranes for efficient conversion of nitro-aromatic pollutants.

催化膜的制备和微观结构的示意图。

  DOI:10.1016/j.apcatb.2022.121456

  国家自然科学基金项目(22178317、22109138)资助。