Confinement of CoP Nanoparticles in Nitrogen‐Doped Yolk‐Shell Porous Carbon Polyhedron for Ultrafast Catalytic Oxidation

Abstract

Catalytic oxidation of toxic organic pollutants in water urgently requires improved efficiency for practical application. Here a wrapping-pyrolysis strategy is exploited to convert CoP nanowires-threaded ZIF-8 into CoP nanoparticlesconfined nitrogen-doped yolk-shell porous carbon polyhedra, featuring highdensity active sites, and high adsorbability, dispersibility and conductivity (4-High). The nanoreactor efficiently activates peroxymonosulfate for bisphenol A (BPA) degradation over a wide pH range and in saline solutions. The apparent kinetic rate constant (18.96 min −1) is the highest reported to date and exceeds those of reported catalysts by 1-2 orders of magnitude. Experimental and theoretical evidence reveals that the catalysis occurs at the Co 4 P 4 @graphitic nitrogen-doped graphene site to produce surface-bound SO 4 •− and induce direct electron abstraction for BPA degradation. The high catalytic activity is attributed to the unique yolk-shell structure which concentrates catalytic and adsorptive sites within a confined space, as well as to the porous carbon polyhedron with high dispersibility and conductivity for fast mass and electron transport. Moreover, a fluidized-bed catalytic unit is constructed and enables continuous zero discharge of BPA and easy nanocatalyst recycling. This work will guide "4-High" catalyst design to improve future deep water purification technology.

Tailored d-Band Facilitating in Fe Gradient Doping CuO Boosts Peroxymonosulfate Activation for High Efficiency Generation and Release of Singlet Oxygen

“…The degradation and detoxification of toxic organic pollutants in the complex water environment is very important for water ecological safety and human health. − Advanced oxidation processes (AOPs) can generate strong oxidizing active oxygen species to oxidize and degrade toxic organic pollutants, providing an effective solution for in situ detoxification and purification of complex water environments. − Some impurities such as inorganic ions and humic acid may react with free radicals (such as ·OH and SO 4 · – ), leading to an ineffective consumption of oxidants. This greatly limits the application of AOPs in complex water environments.…”

Microwave‐Positioning Assembly: Structure and Surface Optimizations for Catalysts

“…Conventional doping methods include high‐temperature diffusion and ion implantation. [ 100,101 ] Compared with these methods, microwave processing has the advantages of rapid synthesis, uniform distribution, and energy conservation for the dopant.…”

Acidic Electrocatalytic CO2 Reduction Using Space-Confined Nanoreactors

“…The porous carbon shell can be used as a protector to prevent the agglomeration of metal nanoparticles (NPs). , In addition, the nanoporous shell also promotes CO 2 surface adsorption and mass transport of relevant species . Moreover, localized reactants between shell and yolk can change the reaction path and achieve selective catalysis . In this regard, we employed yolk–shell materials for CO 2 RR under acidic conditions, with the purpose of regulating the diffusion concentration gradient of CO 2 /H + within the shell. …”

“…17 Moreover, localized reactants between shell and yolk can change the reaction path and achieve selective catalysis. 18 In this regard, we employed yolk−shell materials for CO 2 RR under acidic conditions, with the purpose of regulating the diffusion concentration gradient of CO 2 /H + within the shell.…”