Preparation And Photocatalytic Activity Ofcuprous Oxide/Copper Hydroxide Nanobeltson Nanoporous Copper Substrate

With the development of industrialization,polluted wastewater has become a worldwide problem.The traditional method of degrading sewage cannot completely purify water and produce secondary pollution.In recent years,photodegradation is one of the novel method to treat polluted wastewater,which is not only efficient but also environmentally friendly and pollution-free.However,the rapid recombination of photogenerated electrons and photogenerated holes reduces the photocatalytic activity of semiconductor materials.Therefore,a combination of dealloying and chemical treatment was used to fabricate cuprous oxide/copper hydroxide and nanoporous copper?NP Cu?composite materials.The photogenerated electrons and holes can be effectively separated,which decrease the recombination probability of photoelectron and holes.Consequently,the quantum efficiency and the photocatalytic activity are enhanced.Hence,The following work has been performed:?1?The melt spinning method was used to fabricate amorphous Ti_40.6Zr_9.4Cu_40.6Ni_6.3Sn_3.1ribbons.NP Cu was dealloyed from Ti_40.6Zr_9.4Cu_40.6Ni_6.3Sn_3.1.1 ribbons in 0.2 M HF with different content of PVP in the solution at 313 K for 6 h.The sizes of pores and ligaments decrease obviously with the increasing of PVP content.As the PVP content increased from 0to 10 g/L,the NP Cu pore size decreased from 88 nm to 25 nm.The mechanism for refining the pore size of NP Cu is mainly because of the presence of PVP,which reduces the diffusion coefficient of Cu atoms.?2?The morphology and coverage fraction of Cu₂O nanobelts were studied on the surface of the NP Cu substrates with different pore characteritics.With increasing of sizes of pores and ligaments of the NP Cu substrate,the coverage fraction of Cu₂O nanobelts increases.The relationship between degradation efficiency and the coverage fraction of Cu₂O nanobelts is investigated.MO degradation efficiency increases near linear with the increase of the coverage fraction of Cu₂O nanobelts from 40.4%to 87.9%.The reason for the increase of degradation efficiency is that high coverage increases the heterojunction of NP Cu and Cu₂O,which is beneficial to the flow of photogenerated electrons and thus the photocatalytic performance of the material are enhanced.?3?The Cu?OH?₂/Cu₂O nanobelts on NP Cu substrate were obtained by alkaline oxidation of the dealloyed Ti_40.6Zr_9.4Cu_40.6Ni_6.3Sn_3.1.1 amorphous ribbons which were dealloyed in 0.2 M HF at 313 K for 6 h.The photocatalytic degradation behavior of Cu?OH?₂/Cu₂O@NP Cu composites was studied towards the degradation of MO.It is found that the length and number of Cu?OH?₂/Cu₂O nanobelts increase with the increase of alkaline oxidation time.The results show that the degradation efficiency of the composite with an alkaline oxidation time of 5 s is 98.5%.More Cu₂O is formed in the initial stage of the reaction,which improved photocatalytic activity of the material.