4-Phenoxyphenol-Functionalized Reduced Graphene Oxide Nanosheets: A Metal-Free Fenton-Like Catalyst for Pollutant Destruction

Abstract

Metal-containing Fenton catalysts have been widely investigated. Here, we report for the first time a highly effective stable metal-free Fenton-like catalyst with dual reaction centers consisting of 4-phenoxyphenol-functionalized reduced graphene oxide nanosheets (POP-rGO NSs) prepared through surface complexation and copolymerization. Experimental and theoretical studies verified that dual reaction centers are formed on the C-O-C bridge of POP-rGO NSs. The electron-rich center around O is responsible for the efficient reduction of HO to OH, while the electron-poor center around C captures electrons from the adsorbed pollutants and diverts them to the electron-rich area via the C-O-C bridge. By these processes, pollutants are degraded and mineralized quickly in a wide pH range, and a higher HO utilization efficiency is achieved. Our findings address the problems of the classical Fenton reaction and are useful for the development of efficient Fenton-like catalysts using organic polymers for different fields.

The interaction of surface electron distribution-polarized Fe/polyimide hybrid nanosheets with organic pollutants driving a sustainable Fenton-like process

“…4 The most attractive part is the generation of highly aggressive hydroxyl radicals ( OH, E 0 = 2.80 V/NHE), which have been proved to be one of the most powerful and environment-friendly species to attack organic pollutants. [5][6][7][8] Nevertheless, the widespread use of the Fenton reaction is being limited by its bottleneck problems, including the narrow pH range (pH 2-3) for normal reactions, 9 and the Fe-containing sludge generation due to the rate limitation of electron recycling, 10 which is considered secondary pollution and requires additional treatment processes. To address these problems, various types of heterogeneous Fenton-like materials such as zero-valent transition metals, 11 transition metal oxides, 12,13 supported/doped transition metal solids, [14][15][16] and single atom catalysts 17 were developed.…”

Synergetic effects of graphene–CoPc/silk fibroin three-dimensional porous composites as catalysts for acid red G degradation

“…Typically, k 1 obtained for 90 min of the reaction provides more information about the initial reaction rate, while k 2 obtained for the last time interval of the reaction provides information about the equilibrium between the reactants and products. 40 From the apparent rate constants, it can be seen that the ARG removal rate constants, i.e., k 1 and k 2 rst increased and then decreased with an increase in the catalyst dosage from 1 to 7 mg mL À1 , whether in the rst 90 min or the remaining catalytic reactions. However, when the catalyst concentration in the system exceeded 5 mg mL À1 , the degradation of ARG begun slower than at 3 mg mL À1 concentration due to the presence of enough Co(II) metal species in the solution at the beginning of the reaction.…”

Influence of graphene-based materials on invertebrate and vertebrate

“…In short, the chemical interaction between GRMs and biomolecules was the main chemical mechanism. Reuse with permission from reference [40] and [41] .…”