Highly dispersed gold nanoparticles anchoring on post-modified covalent organic framework for catalytic application

Ternary Au/Bi₂WO₆/BiOBr composites with synergistic effect for enhanced photocatalytic activity

“…These factors together affect the adsorption between dye molecules and photocatalysts. (3) Weak anchoring of Au NPs over Bi 2 WO 6 /BiOBr (porous materials) leads to performance degradation, which was reported by Zhang et al 35) This may be another reason for the low activity of GBT-1 and GBT-2. (4) Excessive addition of Au may act as a recombination center.…”

Controlled growth of ultrafine metal nanoparticles mediated by solid supports

“…It is a common method to capture the metal ions and anchor the resulting UMNPs in organic or hybrid supports, such as metal organic frameworks (MOFs) and covalent organic frameworks (COFs). 28,36 For example, graphene oxide is a carbon support with rich oxygen-containing groups, which can act as nucleation and anchor sites for UMNPs. 37 Heteroatom doping changes the electronic properties of the supports and provides lone-pair electrons to form coordination bonds with the surface metal atoms of UMNPs.…”

Towards mass production of a spherical montmorillonite@covalent organic framework@gold nanoparticles heterostructure as a high-efficiency catalyst for reduction of methylene blue

“…The main reason could be attributed to the special structure of the prepared heterostructure. Firstly, COF functionalized with sulfhydryl groups was designed and synthesized, by which the size of Au NPs was limited and Au NPs were immobilized on the surface of COF (Zhang et al, 2020c). The tiny small size Au NPs could provide abundant active sites for fast electron transfer.…”

“…Nanomaterials such as metal oxides (Cao et al, 2020;Das et al, 2019), clay materials (Arora et al, 2018;Joseph et al, 2019;Peng et al, 2019;Zhang et al, 2018), carbon materials (Qin et al, 2019a;Qin et al, 2019b), and metal-organic frameworks (Gao et al, 2019) were commonly used as carriers due to their large special surface areas to provide more active sites. Recently, the combination of two nanoparticles, covalent organic framework (COF) and ultrafine noble metal nanoparticles (average diameter of less than 5 nm), as a nanocomposite catalyst represents the type of the most investigated heterogeneous catalytic system because of the unique structure and property of COF to control the size of noble metal nanoparticles and the excellent organic pollutants adsorption/electron transfer/products desorption ability for catalytic reduction of organic pollutants (Cao et al, 2017;Zhang et al, 2020c). However, the synthesized COF/ultrafine noble metal nanoparticles nanocomposites are in favor of dispersion in the solution, while it is difficult to separate from the mixture and reuse even through highspeed centrifugation, heavily increasing the cost of toxic organic pollutants treatment.…”