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Xinjiang Physical And Chemical Institute Revealed The Catalytic Mechanism Of Fenton-like Nano-Fe / Graphene Based Catalysts
Jan 03, 2018

Graphene materials with unique physical and chemical properties, in the energy, catalytic and environmental fields have broad application prospects. In recent years, iron-based magnetic nanoparticles have been used to design and prepare heterogeneous Fenton catalysts for their low cost, magnetic separation, and good catalytic activity. The classical Fenton reaction of Fenton (Fe2 + / H2O2) can produce highly reactive hydroxyl radical (• OH), however, it is difficult to be recycled and used in the application of organic pollutants because of the catalyst is difficult to recycle and produce a large amount of iron contamination Mud needs further treatment and other issues subject to certain restrictions.

Recently, Zhang Yagang, a researcher at the Research Center of Resources and Chemistry, Xinjiang Institute of Physics and Chemistry, Chinese Academy of Sciences, led his team to load Fe0 and Fe3O4 uniformly on the RGO at the nanometer scale, resulting in a magnetically separable and highly catalytically active The nanosized catalyst (Fe0 / Fe3O4-RGO) was repeatedly used as a heterogeneous Fenton catalyst to degrade the phenol pollutants in the aqueous phase.

In the previous research work, Zhang Ya-gang team explored the reduction process of graphene oxide and magnetically functionalized it to prepare the magnetically reduced graphene oxide materials with different reduction degrees for the adsorption of pollutants bisphenol A The effect of the degree of reduction of graphene oxide on the adsorption kinetics and adsorption capacity of BPA was revealed.

On this basis, in order to enable the catalyst to be reused many times during the catalysis process, researchers use graphene as a carrier to uniformly load Fe0 and Fe3O4 on the graphene at the nanoscale and prepare a nano-Fe-based / graphene Fenton-like catalyst (Fe0 / Fe3O4-RGO), which is used to catalyze the degradation of phenol in water pollutants. The experimental results show that the prepared nano-catalyst Fe0 / Fe3O4-RGO has excellent catalytic activity, can be 100 minutes phenol degradation 100%, the catalyst has excellent stability, and can be reused repeatedly, after five catalytic cycles of its Phenol removal efficiency can still reach 93%. In addition, the catalyst can be magnetically separated simply and quickly.

Researchers also revealed the unique catalytic mechanism of nano Fe / graphene-based Fenton catalysts (Fe0 / Fe3O4-RGO). The catalytic mechanism to Fe0 / Fe3O4 / RGO synergistic effect ≡ Fe2 + regeneration recovery as the core. FeO nanoparticles and Fe3O4 nanoparticles are uniformly dispersed on the RGO at the nanoscale, exposing more active sites to the surface of the support. The RGO as an electron transfer medium can effectively promote the transfer of electrons from Fe0 to Fe3O4 such that ≡ Fe2 + is regenerated. The π-π interaction between phenol molecule and RGO makes the phenol molecule adsorb on the catalyst surface effectively, increasing the probability of the phenol molecules contacting OH. Based on these factors, Fe0 / Fe3O4-RGO has excellent Fenton-like catalytic activity.

Relevant research results have been declared Chinese invention patents, and recently published in RSC Advances. The design of the nano-catalyst which can be magnetically separated, highly catalytically active and can be reused repeatedly provides a new design idea for the design of catalysts based on Fenton-like reaction for oxidative degradation of organic pollutants.

The research work is supported by such projects as the National Natural Science Foundation of China, the "Thousand Talents Program" and the Xinjiang Young Science and Technology Innovative Talents - Outstanding Young Scientists Fund.