Controllable Synthesis And Performance Of Cerium-Based Rare Earth Oxide Nanostructures

In the anodic alumina(AAO)nano-array pore template,cerium-based rare earth oxide nano-structured material could be prepared by negative pressure filtration and chemical coprecipitation method,and the morphology,composition and structure of the cerium-based rare earth oxide nano-structured material could be characterization by SEM,TEM,XRD,EDS et al.The fluorescence properties were studied respectively.The adsorption and removal rates of Congo red by different nanostructures were compared,and the fluorescence emission peak characteristics of samarium and europium doped were studied.The correlation between the preparation process,the relative concentration of doping elements and the fluorescence properties were studied.The main findings were as follows:1.The uniform and regular of CeYxOy nanotubes and nanowires were synthesized successfully in AAO template,the adsorption and removal ability of Congo red dye was studied under dark light condition and compared with CeYxOy nanoparticles prepared by hydrothermal method.The results showed that the adsorption capacity of CeYxOy nanotubes,nanowires and nanoparticles to Congo red was 801.9 mg/g,668.2 mg/g and 414.9 mg/g,respectively.The adsorption property of CeYxOy nanotubes was the strongest,and the adsorption kinetics was consistent with the Langmuir adsorption isotherm.2.The fluorescence properties of Eu3+ doped CeYxOy nanotubes,nanowires and nanoparticles were studied.Under the excitation wavelength of 394 nm,the emission intensity of CeYxOy:Eu3+ nanotubes was the strongest.In addition,that fluorescence intensity of the nanotube increases with the increase of Eu3+ doping concentration,the fluorescence emission intensity was the strongest when the relative concentration of Eu3+ uoping reach 6%,and the fluorescence quenching phenomenon occurs when the relative concentration of Eu3+ doping exceeds 6%,and the calcination temperature affected the fluorescence intensity of CeYxOy:Eu3+ nanotubes.3.The CeYxLayOz:Eu3+ and CeYxZnyOz:Eu3+ nanotubes were prepared respectively.They were excited by 340 nm light and had strong fluorescence emission peaks at 471 nm.Under excitation with 394 nm,CeYxLayOz:Eu3+ nanotubes had fluorescence emission peaks at 613 nm and 702 nm.CeYxZnyOz:Eu3+ nanotubes had fluorescence emission peaks at 616 nm and 704 nm,and red shift phenomenon.Compared with Eu3+ doped nanotubes,CeYxLayOz:Sm3+ and CeYxZnyOz:Sm3+nanotubes had broad and strong fluorescence emission peaks at 471 nm under 340 nm excitation.Excitation with 394 nm,CeYxLayOz:Sm3+ nanotubes had emission peaks at 593 nm and 694 nm,and CeYxZnyOz:Sm3+ nanotubes undergo fluorescence quenching.4.The CeNdxOy and CePrxOy nanowires were prepared and doped with Eu3+.Under excitation with the wavelength of 450 nm,CeNdxOy:Eu3+ had fluorescence emission peaks at 516 nm and 777 nm,and CePrxOy:Eu3+ nanowires had fluorescence emission peaks at 528 nm,679 nm and 776 nm,respectively.The average fluorescence lifetime of CePrxOy:Eu3+ was longer than that of CeNdxOy:Eu3+.