Research On The Energy-storage Self-catalysis Material Of Porous Sr₂MgSi₂O₇:Eu²⁺,Dy³⁺Assembles BiVO₄

Energy crisis and environmental pollution have aroused scientists’ great attention to study the action to visible light and improvement of energy efficiency. Organic pollution can be degraded using solar energy with catalysis technique, which is one of the most efficient ways to solve water pollution. Another reason that scientists devote most of their time to studying catalysis materials is due to its environmental friendly property without second-pollution. However, traditional catalysis material can only make use of 5% ultraviolet rays. Besides, when it was exposed into dark environment, it stopped working at once. To improve degradation of photocatalysis materials and practical use of energystorage materials, an idea was put forward that Bi VO4 could be assembled into pores of Sr2 Mg Si2O7:Eu2+,Dy3+ carriers. Compounds may achieve that Sr2 Mg Si2O7:Eu2+,Dy3+ store energy and then Bi VO4 take place self-photocatalysis in darkness.Bi VO4 are successfully prepared with two different methods, hydro-thermal method and sol-gel method. Results show that Rh B solution can be degraded 88.4% by the sample with 100 nm diameter, prepared with hydro-thermal temperature 140℃for 15 h and heat treatment at 400℃ for 3h. Another kind of Bi VO4 particles of 70~100nm were synthesized by sol-gel method, whose degradation reaches 91.2%. It can be gained with precursor p H 7, ions concentration 0.02mol/L and heat treatment at 500℃ for 1h.Porous energy-storage Sr2 Mg Si2O7:Eu2+, Dy3+ carriers are prepared with solhydrothemal method. Sample performs 300 nm porous diameter and brilliant energystorage, which was prepared with 0.3mol H3BO3 and Eu2+/Dy3+ratio of 1:2, pre-sintered at 600℃ for 30 min and calcined at 1050℃ for 2h. It presents sharp peaks at 360 nm and 473 nm in excitation and emission spectra and longest time in long-last decay curves.Bi VO4 can be successfully assembled into Sr2 Mg Si2O7:Eu2+,Dy3+ pores with impregnation method and electrophoretic deposition method, whose samples are labeled 1# and 2#. Sample 1# shows separate degradation of 94.1% and 25.7% in illumination and dark experiments. Sample 2# presents 94.6% and 29.4% degradation, respectively.