Adjustable morphology rare-earth ion codoped tungsten oxide nanoparticle and synthesis method thereof

A technology of rare earth ions and nanoparticles, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, chemical/physical processes, etc., can solve the problem of rare earth ion co-doped tungsten oxide nanoparticles The preparation method has no problems such as reports, and achieves the effects of high utilization rate, easy acquisition, and low reaction temperature

Inactive Publication Date: 2020-01-14
TIANJIN UNIV
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Problems solved by technology

[0005] In summary, in recent years, although the synthesis method of tungsten oxide used as a photocatalyst has been developed rapidly, and the research on improving the catalytic efficiency has been deepened, the rare earth ion co-doped tungsten oxide nanoparticles that can convert near-infrared sunlight into visible light And its preparation method has not been reported yet, and the patent related to it has not been announced

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  • Adjustable morphology rare-earth ion codoped tungsten oxide nanoparticle and synthesis method thereof
  • Adjustable morphology rare-earth ion codoped tungsten oxide nanoparticle and synthesis method thereof
  • Adjustable morphology rare-earth ion codoped tungsten oxide nanoparticle and synthesis method thereof

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Embodiment 1

[0019] Example 1: This embodiment synthesizes WO with a cubic shape 3 :Yb 3+ / Er 3+ The method of nanopowder is realized according to the following steps:

[0020] 1. Weigh 2mmol of Na 2 WO 4 2H 2 O, configure 0.2mmol / mL erbium nitrate solution and ytterbium nitrate solution respectively, dissolve the weighed sodium tungstate in deionized water, stir and dissolve at room temperature, and then add 70 μL 0.2mmol / mL Er 3+ solution, 560 μL 0.2 mmol / mL of Yb 3+ solution, then add 2mmol of EDTA-2Na powder to the mixed solution, then add 4mL of concentrated hydrochloric acid, then add 2mL of n-butanol and an appropriate volume of deionized water to make the total volume of the mixed solution the same.

[0021] 2. Pour the mixed solution into an autoclave lined with polytetrafluoroethylene, with a filling degree of 75%. After the autoclave is sealed, put it into an oven at 130°C for heat treatment for 24 hours. After the autoclave is naturally cooled, the obtained The product w...

Embodiment 2

[0023] Example 2: This embodiment synthesizes WO with a cubic shape 3 :Yb 3+ / Tm 3+ The nanoparticle method is implemented in the following steps:

[0024] 1. Weigh 2mmol of Na 2 WO 4 2H 2 O, prepare 0.2mmol / mL thulium nitrate solution and ytterbium nitrate solution respectively, dissolve the weighed sodium tungstate in deionized water, stir to dissolve at room temperature, and then add 70μL 0.2mmol / mL Tm 3+ solution, 560 μL 0.2 mmol / mL of Yb 3+ solution, then add 4mmol of EDTA-2Na powder to the mixed solution, then add 4mL of concentrated hydrochloric acid, then add 2mL of n-butanol and an appropriate volume of deionized water to make the total volume of the mixed solution the same.

[0025]2. Pour the mixed solution into an autoclave lined with polytetrafluoroethylene, with a filling degree of 75%. After the autoclave is sealed, put it into an oven at 130°C for heat treatment for 18 hours. After the autoclave is naturally cooled, the obtained The product was successiv...

Embodiment 3

[0026] Embodiment 3: The difference between this embodiment and specific embodiment 1 and embodiment 2 is that after obtaining the reaction product, the powder obtained by the reaction is placed in a quartz crucible, and it is annealed at a high temperature using a muffle furnace. Calcined at high temperature for 5 hours at ℃ to achieve ellipsoidal WO 3 :Yb 3+ / Er 3+ Synthesis of nanopowders.

[0027] The rare earth ion co-doped tungsten oxide nanoparticles synthesized in this embodiment, from the XRD spectrum, it can be illustrated that what is synthesized is monoclinic rare earth ion co-doped tungsten oxide, and its characteristic peak is shown in the figure (see figure 1 ), from the SEM image, we can see the small sheets of small particles piled up (see figure 2 ), and the adjusted ellipsoid (see image 3 ).

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Abstract

The invention belongs to the field of inorganic nano materials and in particular relates to an adjustable morphology rare-earth ion codoped tungsten oxide nanoparticle and a synthesis method thereof.The rare-earth ion codoped tungsten oxide nanoparticle has a chemical formula of WO3:RE<3+>, and has a crystal phase of a monoclinic crystal phase. The specific synthesis process comprises the following steps: adding a rare-earth ion nitrate solution into a sodium tungstate aqueous solution, further dropwise adding concentrated hydrochloric acid, n-butyl alcohol and EDTA-2Na, performing sufficientstirring, performing hydrothermal treatment on the mixed solution, naturally cooling the solution, performing centrifugation, washing and drying so as to obtain a cubic WO3:RE<3+> nanoparticle, and performing high-temperature annealing on the nanoparticle, so as to obtain an ellipsoid-like WO3:RE<3+> nanoparticle. The WO3:RE<3+> nanoparticle which is synthesized by using a mixed solvothermal method, which is provided by the invention, has the advantages of being uniform in particle size, small in size, good in dispersibility, high in purity, and the like, has the potential of being used as aphotocatalyst to widen the spectrum response range of conventional tungsten oxide, and is capable of effectively improving the catalysis efficiency of a catalyst.

Description

technical field [0001] The invention belongs to the field of inorganic nanometer materials, and in particular relates to rare earth ion co-doped tungsten oxide nanoparticles with adjustable shape and a synthesis method thereof. Background technique [0002] Problems such as water pollution and air pollution in today's society are common problems faced by mankind that need to be solved urgently. One of the methods to solve these environmental problems is to find suitable catalysts to realize the effective degradation of organic pollutants and harmful gases by using the photocatalytic effect of sunlight. Due to their unique tiny size and structure, nanomaterials have higher specific surface area and more active sites, which cannot be achieved by bulk materials. Therefore, nanomaterials are the key research objects in the field of photocatalysis. Among them, nano-sized WO 3 It has a good photoelectric conversion effect, its band width is 2.5-3.0eV, and the corresponding absor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/02
CPCB01J23/30B01J35/004B01J35/023B01J35/026
Inventor 韩迎东李凡程振洲王杰杨佳麒徐霁盈刘铁根
Owner TIANJIN UNIV
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