Preparation And Fenton-like Catalytic Activity Of Nanostructured CuO Composites

With the rapid development of textile industry, the species and ingredient of dyes have been renovated constantly. High-efficiency catalytic approaches dealing with dyes-polluted water are highly desired accordingly. Among all the catalytic technologies, Fenton-like catalysts with the assistance of H2O2 display their superiority, such as simple process for material synthesis, fast degradation speed, environment-friendly clean process, cost-efficient consumption and ordinary facilities support. Recently, some metallic oxides or oxyhalides(Fe3O4, CeO2, BiOBr, FeOCl), metal chalcogenides(Cu9S5, CuS, CuS/CuSe, FeS) and metal phosphates(Fe5(PO4)4(OH)3·2H2O) have been explored as Fenton-like catalysts to degrade organic pollutants. CuO, a kind of multi-purpose semiconductor, has important applications in the areas of gas sensors, photocatalysis and Li-ion batteries. Recently, it has attracted widespread attention due to its Fenton-like properties. A large number of research works had shown that CuO had a high affinity towards hydrogen peroxide(H2O2) and exhibited high peroxidase-like activity. It has been regarded as a replacement for peroxidase in biosensors for glucose detection. Nano CuO particles had been demonstrated to be active and sensitive to catalyze the oxidation of TMB(3,3',5,5'-Tetramethylbenzidine) and OPD(o-phenylenediamine) by H2O2. In view of its efficiency of decomposing H2O2 into HO? radicals, CuO should be considered as a potential material applied in dyes degradation.(1) MOFs-derived CuxO@C composites as Fenton-like catalystsA two-step calcination strategy was developed to fabricate CuxO@C composites with Cu-based MOFs(metal-organic frameworks) as the template and the precursor. The cubic frame of Cu-MOFs is well preserved and carbon-encapsulated CuxO(x=1,2) nanoparticles homogeneously distributed on the surface of graphitic carbon slices are obtained by first calcination in N2 and then in air. With the assistance of hydrogen peroxide(H2O2), the CuxO@C composites exhibit excellent Fenton-like performance, which attribute to the porous structure and the formation of graphite carbon.(2) rGO-CuO composites as Fenton-like catalystsrGO-CuO composites were prepared by hydrothermal synthesis with graphene oxide using Cu2(OH)2CO3 syntheticed by Cu(NO3)2 and Na2CO3 solution as a precursor. The results of the Fenton-like catalytic decolorization of RhB solution showed that when the amount of rGO of CuO is 0.1 wt%, the rGO-CuO showed the highest Fenton-like catalytic activity. And rGO-CuO can effectively decolorize and preserve a steady catalytic performance. Based on the results of the experiments and characterization, it is believed that rGO can make a good contact with H2O2 and CuO because its adsorbability and quickly transfer electrons, resulting improved Fenton-like catalytic activity.(3) Ag-CuO composites as Fenton-like catalysts under visible lightA photochemical deposition strategy was developed to fabricate Ag-CuO composites with Cu O that syntheticed by calcination of Cu powder in air as the precursor. The results of the Fenton-like catalytic decolorization of RhB solution under visible light showed that when the amount of Ag of CuO is 10 wt% in theory, the Ag-CuO showed the highest Fenton-like catalytic activity under visible light. And Ag-CuO can effectively decolorize and preserve a steady catalytic performance. Based on the results of the experiments and characterization, it is believed that Ag can quickly transfer photogenerated electrons, resulting in a highly efficient separation of photogenerated charges and improved Fenton-like catalytic activity under visible light.