Study On The Preparation,NIR Photocatalysis And Temperature Sensing Properpies Of Rare Earth Doped Composites

Environmental pollution and energy depletion are two major challenges facing human sustainable development in the 21st century.Solar energy is the most important natural resource for human beings.It directly or indirectly provides energy for humans to maintain normal lives.However,the ultraviolet?4%?and near-infrared?50%?parts of sunlight are not fully utilized.Rare earth-doped fluoride up-conversion luminescent materials have been widely concerned due to their unique phonon energy,long fluorescence lifetime,and high reflectance.I found that coating photocatalysts on the up-conversion luminescent materials YF₃:Tm³⁺,Yb³⁺has a certain photocatalytic effect under the irradiation of a 976nm laser,so this article has conducted in-depth research in this area.At the same time,combined with the fact that researchers have applied photocatalysts to temperature sensing over the years,this article has studied rare earth ion-doped bismuth tungstate photocatalysts and achieved preliminary results.The main contents of this article are summarized as follows:?1?YF₃:Tm³⁺,Yb³⁺up-conversion luminescent materials were prepared using a simple and environmentally friendly hydrothermal method.Based on this,YF₃:Tm³⁺,Yb³⁺/Bi₂MoO₆ composites were prepared by adding solvothermal methods to the corresponding amounts of YF₃:Tm³⁺,Yb³⁺powders in Bi₂MoO₆ precursors.Based on the successful preparation of YF₃:Tm³⁺,Yb³⁺/Bi₂MoO₆ composite materials,Ag particles were supported on the surface of YF₃:Tm³⁺,Yb³⁺/Bi₂MoO₆ composites by photo-deposition technology.The composition,morphology and luminescence properties of the samples were analyzed using XRD,SEM,SEM-EDS,SEM-Mapping,PL spectroscopy and other characterization methods.In order to analyze the photocatalytic activity of the sample,the sample was subjected to liquid phase degradation of rhodamine B under the irradiation of a 976nm laser.After 10hours of illumination,we concluded that when the molar ratio of YF₃:Tm³⁺,Yb³⁺and Bi₂MoO₆ was 1:4,YF₃:Tm³⁺,Yb³⁺/Bi2MoO6 composites have the highest degradation rates.Based on this,after 7wt%Ag particles were light-deposited,the degradation efficiency of rhodamine B increased from 18.8%to 60%.Finally,the stability of the catalyst was studied by repeating the photocatalytic degradation experiment five times for the same sample.?2?Using a simple chemical precipitation method,the Ag2O nanoparticles were successfully coated on YF₃:Tm³⁺,Yb³⁺powders.Based on the successful preparation of YF₃:Tm³⁺,Yb³⁺/Ag₂O composite materials,Ag particles were supported on the surface of YF₃:Tm³⁺,Yb³⁺/Ag₂O composites by photo-deposition technology.The composition,morphology and luminescence properties of the samples were analyzed using XRD,SEM,SEM-EDS,SEM-Mapping,PL spectroscopy and other characterization methods.In order to analyze the photocatalytic activity of the sample,the sample was subjected to liquid phase degradation of rhodamine B under the irradiation of a 976nm laser.After 10 hours of illumination,we concluded that when the mass ratio of YF₃:Tm³⁺,Yb³⁺to Ag₂O was 1:2,the degradation rate of YF₃:Tm³⁺,Yb³⁺/Ag₂O composites is the highest.On this basis,after 7wt%Ag particles are light-deposited,the degradation efficiency of rhodamine B increases from 24.6%to63.9%.Finally,the stability of the catalyst was studied by repeating the photocatalytic degradation experiment five times for the same sample.?3?Bi₂WO₆:Er³⁺,Yb³⁺nanocrystals were successfully prepared by co-precipitation and low-temperature muffle furnace calcination.XRD,SEM and PL spectra were used to characterize and analyze the composition,morphology and luminescence of the samples.Finally,Bi₂WO₆:Er³⁺,Yb³⁺nanocrystals,which have not been reported in terms of temperature sensing performance,have been tested and have achieved certain results.