Ultrafine Silver Nanoparticles Supported on a Conjugated Microporous Polymer as High-Performance Nanocatalysts for Nitrophenol Reduction

Abstract

A conjugated microporous polymer (CMP) material was designed with pore function of cyano and pyridyl groups that act as potential binding sites for Ag ion capture. Ultrafine silver nanoparticles (less than 5 nm) were successfully supported on the predesigned CMP material to afford Ag@CMP composite materials by means of a simple liquid impregnation and light-induced reduction method. Spherical Ag nanoparticles with a statistical mean diameter of ca. 3.9 nm were observed and characterized by scanning electron microscopy and transmission electron microscopy. The Ag@CMP composite materials were consequently exploited as high-performance nanocatalysts for the reduction of nitrophenols, a family of priority pollutants, at various temperatures and ambient pressure. Moreover, the composite nanocatalysts feature convenient recovery and excellent reusability. This work presents an efficient platform to achieve ultrafine metal nanoparticles immobilized on porous supports with predominant catalytic properties by virtue of the structural design and spatial confinement effect available for conjugated microporous polymers.

Mussel inspired green synthesis of silver nanoparticles-decorated halloysite nanotube using dopamine: characterization and evaluation of its catalytic activity

“…11c) also suggests the reduction reaction dawdles first-order reaction kinetics. The rate constants (k) for reduction of 4-NP obtained from liner relation for each catalytic HNTAgX nanocomposites have been shown in Table 1.The rate constant and time required for catalytic conversion of 4-NP are higher than commercially available Pt/C nanocatalyst and previous reported results (as shown in Table 2) (Cao et al 2017;Hareesh et al 2016;Sahoo et al 2014;Wang et al 2012Wang et al , 2013Wang et al , 2015. To determine the ideal concentration of AgNO 3 at which rate constant of catalytic reduction will be maximum, we performed the catalytic reduction of 4-NP in the presence of NaBH 4 for six different HNTAgX nanocomposite.…”

Preparation of magnetic conjugated microporous polymers for highly efficient removal of dye from water

“…CMP‐based adsorbents show great potential for wastewater treatment . They can easily remove hydrophobic pollutants, such as oil and polar or toxic organic solvents from wastewater because of their oleophilic nature and geometrical microstructure . However, due to strong solute–water (H 2 O) interaction between the adsorbent and wastewater, the adsorption capability of CMPs for hydrophilic solutes, such as H 2 O‐soluble dye and metal iron, is reduced.…”

“…22 They can easily remove hydrophobic pollutants, such as oil and polar or toxic organic solvents from wastewater 23,24 because of their oleophilic nature and geometrical microstructure. 25,26 However, due to strong solute-water (H 2 O) interaction between the adsorbent and wastewater, the adsorption capability of CMPs for hydrophilic solutes, such as H 2 O-soluble dye and metal iron, is reduced. Therefore, ways have been developed to turn monomers microstructures of the materials or develop their surface oleophilicity and hydrophobility by modifying some hydrophilic groups for wastewater treatment.…”

Synthesis of a palladium acetylide-based tubular microporous polymer monolith via a self-template approach: a potential precursor of supported palladium nanoparticles for heterogeneous catalysis

“…Metal NPs are generally loaded in a MOP support by two step processes, in which soluble metal complexes are rst dispersed in the support and then are reduced to metal NPs. [10][11][12][13] This in situ reduction approach has an advantage in preventing the NP aggregation compared to the direct incorporation of metal NPs, but the even distribution of NPs in the support is still a challenge. When metal precursors are externally added to the microporous support for the reduction, the micropore diffusion resistance can be encountered.…”