Synthesis And Properties Of Metal-Doped Silver Vanadates Nano-Materials

Vanadate is a kind of functional material that are used in optics,electricity and catalysis.Among these functional materials,silver vanadate?Ag₃VO₄?is widely appied in lithium battery materials,gas sensors,photocatalysts and advanced biomedical devices because of its unique electrical,optical,magnetic and ionic properties.Some properties of Ag₃VO₄ are significantly improved by doped with Eu and Nd metal elements.In this study,Ag₃VO₄ and AgNO₃ were used as raw materials,P123 was used as a structure-directing agent and porogen,and water was used as a solvent.Ag₃VO₄ micro-nano materials were prepared by hydrothermal method.In this experiment,the effects of hydrothermal synthesis time and temperature on the morphology of Ag₃VO₄ were investigated.Finally,the best synthesis conditions for Ag₃VO₄ were optimized.The experiment is based on the best preparation conditions of Ag₃VO₄ doped with two metal elements:Eu and Nd.Based on this,the photocatalytic and electrochemical properties of Ag₃VO₄ doped with two metal elements,Eu and Nd,respectively,were investigated.The effects of different Eu doping amount and different Nd doping amount on the photocatalytic and electrocatalytic properties of Ag₃VO₄were investigated.The hydrothermally obtained product was dried and calcined.The morphology,structure and composition of the product were characterized by XRD,SEM,TEM,BET and UV-Vis.The photocatalytic degradation product was selected to be Rhodamine B.The electrocatalytic performance of Ag₃VO₄ and Nd/Ag₃VO₄ was investigated by selecting ascorbic acid for Ag₃VO₄ and Eu/Ag₃VO₄ degradation and electrocatalytic detection.Ag₃VO₄ was synthesized by the hydrothermal method.When the morphology of Ag₃VO₄ is the best,the hydrothermal temperature is 180?and the hydrothermal time is 12 h.Doping of Eu under the optimal preparation conditions of Ag₃VO₄,the doped amount of Eu is4%and reacted at 80?for 10 h,the obtained Eu/Ag₃VO₄ have the highest visible light photocatalytic activity.After 180 min in the visible light,the degradation rate of Rhodamine B by Eu/Ag₃VO₄ can reached 92.9%.Nd is doped under the optimal preparation conditions of Ag₃VO₄.When the doped amount of Nd is 2%,ascorbic acid had better electrocatalysis.