Preparation method and application of tantalum-doped barium tungstate bismuthate with X-ray absorption function

Abstract

The invention discloses a preparation method of tantalum-doped barium bismuthate tungstate with an X-ray absorption function. The preparation method comprises the following steps: preparing the following raw materials in molar mass: 0.2 to 0.5 mol of bismuth compound, 0.2 to 0.5 mol of tantalum compound, 0.1 to 0.2 mol of barium salt and 0.1 to 0.2 mol of tungsten compound; the preparation method comprises the following steps: dissolving the raw materials in 500-2000mL of polar solvent, and carrying out hydrothermal reaction; alternately washing the obtained precursor with distilled water and absolute ethyl alcohol to remove impurities, and then carrying out drying treatment; and finally, calcining to finally form the nano powder. The invention provides a preparation method of tantalum-doped barium bismuthate with an X-ray absorption function, solves the problems of a traditional lead-containing protective material, and also has the X-ray absorption function, and the invention also provides an application of the tantalum-doped barium bismuthate with the X-ray absorption function in the X-ray protective material.

Description

Technical Field

[0001] This invention relates to the field of X-ray protection technology, and in particular to a method for preparing barium tantalum tungsten bismuthate with X-ray absorption function and its application. Background Technology

[0002] X-ray shielding materials typically use substances containing high atomic number (Z) elements as radiation-absorbing materials. The absorption of X-rays by matter mainly includes two forms: energy absorption and particle absorption. Energy absorption occurs through elastic and / or inelastic scattering of X-rays with matter, such as the Compton effect. Energy absorption is proportional to the fourth power of the atomic number of the substance, and it is dominant when the X-ray energy is high. Particle absorption occurs through the interaction of X-rays with the atoms or nuclei of matter, such as the photoelectric effect and pair production. For medium and low-energy X-rays, particle absorption is dominant. Atomic structures are divided into K, L, M, and N, representing different electron shells. The position of the K-shell absorption edge of a substance's atoms is the main factor determining its particle absorption capability. For low-energy X-rays, the L-shell absorption of the substance also plays a role.

[0003] Traditional X-ray shielding materials mainly use lead-based sheets and lead-containing rubber as the main shielding material. Lead-containing rubber is a new type of X-ray shielding material prepared by blending lead powder, lead oxide, or mixtures thereof with rubber materials (natural rubber, butyl rubber, PE, etc.). However, lead-containing X-ray shielding materials suffer from drawbacks such as high density, lead toxicity, low shielding efficiency, high weight attenuation coefficient, complex processing procedures, and difficulties in recycling. Summary of the Invention

[0004] The purpose of this invention is to provide a method for preparing barium tantalum tungsten bismuthate with X-ray absorption function and its application, which solves the problems of traditional lead-containing protective materials and also has X-ray absorption function.

[0005] The technical solution adopted in the preparation method of barium tantalum tungstic bismuthate with X-ray absorption function disclosed in this invention is as follows: A method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function includes the following steps: The molar masses of each raw material are as follows: bismuth compound 0.2-0.5 mol, tantalum compound 0.2-0.5 mol, barium salt 0.1-0.2 mol, and tungsten compound 0.1-0.2 mol. Dissolve the above raw materials in 500-2000 mL of a polar solvent and carry out a hydrothermal reaction; The precursor obtained above was washed with distilled water and anhydrous ethanol alternately to remove impurities, and then dried. Finally, through calcination, it eventually forms Nanoparticles.

[0006] As a preferred embodiment, the bismuth compound includes one or more of bismuth oxychloride, bismuth nitrate, and bismuth chloride; the tantalum compound includes one or more of sodium tantalate and tantalum chloride; the barium salt includes one or more of barium chloride, barium nitrate, and barium acetate; and the tungsten compound includes one or more of sodium tungstate and tungsten chloride.

[0007] As a preferred embodiment, the polar solvent includes one of deionized water, ethanol, and ethylene glycol.

[0008] As a preferred embodiment, the hydrothermal reaction temperature is 180℃-280℃, and the reaction time is 12-36h.

[0009] As a preferred embodiment, the calcination is carried out in a muffle furnace at a temperature of 300-600℃ for 2-5 hours.

[0010] An application of barium tantalum tungsten bismuthate as described above in X-ray protection materials will... Nanoparticles are added as X-ray absorbers and fillers to X-ray protective materials. The proportion of nanoparticles is 10-40 wt%.

[0011] The beneficial effect of the method for preparing barium tantalum-doped tungsten bismuthate with X-ray absorption function disclosed in this invention is that a multi-K absorption edge complementary system is constructed in the barium bismuthate matrix through the synergistic doping of tantalum, tungsten, and bismuth elements in bismuth, tantalum, and tungsten compounds. Specifically, it involves elemental doping. The K absorption edge of the W element is 69.5 keV. The absorption edge of Bi element K is 90.5keV, and the absorption edge of Ta element is about 67.4keV. When the three are superimposed, they form a continuous strong absorption range in the range of 37-91keV, which perfectly covers the range of 40-70keV of the main energy band of medical CT.

[0012] Compared to traditional lead-based materials, this material avoids environmental risks while broadening the effective absorption energy range, solving the shielding gap caused by the sharp drop in absorption coefficient outside the absorption edge of a single component, and achieving atomic-level uniform substitution through hydrothermal reaction in a polar solvent, forming... The perovskite-like structure, rather than a physical mixture, ensures the ideal superposition of absorption cross sections of multiple elements rather than their mutual weakening. Subsequent washing-drying-calcination processes further regulate crystallinity and phase purity, resulting in nanoparticles with high specific surface area and dispersibility. These nanoparticles can be adapted to various carriers such as coatings and fibers to produce X-ray protection materials, achieving customized shielding performance. They also possess three core advantages: high atomic number synergy, continuous energy level matching, and process scalability. Attached Figure Description

[0013] Figure 1 This refers to the material density corresponding to the material in Example 1, the rubber composite material, and the lead apron. Detailed Implementation

[0014] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings: A method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function includes the following steps: The molar masses of each raw material are as follows: bismuth compound 0.2-0.5 mol, tantalum compound 0.2-0.5 mol, barium salt 0.1-0.2 mol, and tungsten compound 0.1-0.2 mol. Bismuth compounds include one or more of bismuth oxychloride, bismuth nitrate, and bismuth chloride; tantalum compounds include one or more of sodium tantalate and tantalum chloride; barium salts include one or more of barium chloride, barium nitrate, and barium acetate; and tungsten compounds include one or more of sodium tungstate and tungsten chloride.

[0015] Dissolve the above raw materials in 500-2000 mL of a polar solvent and carry out a hydrothermal reaction. The polar solvent includes one of deionized water, ethanol, and ethylene glycol. The hydrothermal reaction temperature is 180℃-280℃ and the reaction time is 12-36 h. The precursor obtained above was washed with distilled water and anhydrous ethanol alternately to remove impurities, and then dried. Finally, it is calcined in a muffle furnace at a temperature of 300-600℃ for 2-5 hours to form the final product. Nanoparticles.

[0016] A multi-kine absorption edge complementary system was constructed in a barium bismuthate matrix by synergistic doping of tantalum, tungsten, and bismuth in bismuth, tantalum, and tungsten compounds. Specifically, it was a single-element system. The K absorption edge of the W element is 69.5 keV. The absorption edge of Bi element K is 90.5keV, and the absorption edge of Ta element is about 67.4keV. When the three are superimposed, they form a continuous strong absorption range in the range of 37-91keV, which perfectly covers the range of 40-70keV of the main energy band of medical CT.

[0017] Compared to traditional lead-based materials, this material avoids environmental risks while broadening the effective absorption energy range, solving the shielding gap caused by the sharp drop in absorption coefficient outside the absorption edge of a single component, and achieving atomic-level uniform substitution through hydrothermal reaction in a polar solvent, forming... The perovskite-like structure, rather than a physical mixture, ensures the ideal superposition of absorption cross sections of multiple elements rather than their mutual weakening. Subsequent washing-drying-calcination processes further regulate crystallinity and phase purity, resulting in nanoparticles with high specific surface area and dispersibility. These nanoparticles can be adapted to various carriers such as coatings and fibers to produce X-ray protection materials, achieving customized shielding performance. They also possess three core advantages: high atomic number synergy, continuous energy level matching, and process scalability.

[0018] An application of barium tantalum tungsten bismuthate as described above in X-ray protection materials will... Nanoparticles are added to X-ray protection materials as X-ray absorbers and fillers. The proportion of nanoparticles is 40-80 wt%.

[0019] Specifically, this means: to synthesize the new... Nanoparticles, used as X-ray absorbers and fillers, are added to materials such as organosilicon, natural rubber, neoprene rubber, PE, and PVC and mixed evenly. The nanoparticle content is 10-40 wt%. The mixture is mixed at room temperature, mechanically stirred, and vacuum degassed at a temperature of 50-80℃ for 6-24 hours. Through appropriate processing methods, it is made into sheets, coatings, or spun fibers, forming materials that absorb X-rays and convert them into harmless photons or heat energy, thereby effectively reducing the harm of X-rays to personnel, equipment, and the environment.

[0020] Example 1 0.35 mol bismuth oxychloride, 0.35 mol tantalum chloride, 0.15 mol barium chloride, and 0.15 mol sodium tungstate were added to 1000 mL of distilled water and stirred until homogeneous. The mixture was then transferred to a hydrothermal reactor and reacted at 200 °C for 24 h. The mixture was then washed with anhydrous ethanol and finally calcined in a muffle furnace at 500 °C for 3 h.

[0021] Comparative Example 1: The difference between this embodiment and Embodiment 1 is that bismuth oxychloride, tantalum chloride, and barium chloride are not added in step (1).

[0022] 0.15 mol of sodium tungstate was added to 1000 mL of distilled water and stirred until homogeneous. The mixture was then transferred to a hydrothermal reactor and reacted at 200 °C for 24 h. Afterward, the mixture was washed with anhydrous ethanol and finally calcined in a muffle furnace at 500 °C for 3 h. This process was used to synthesize sodium tungstate by adding only sodium tungstate. .

[0023] Comparative Example 2: The difference between this embodiment and Embodiment 1 is that bismuth oxychloride, tantalum chloride, and barium chloride are not added in step (1).

[0024] 0.35 mol of bismuth nitrate and 0.15 mol of sodium tungstate were added to 1000 mL of distilled water and stirred until homogeneous. The mixture was then transferred to a hydrothermal reactor and reacted at 200 °C for 24 h. After washing with anhydrous ethanol, the mixture was calcined in a muffle furnace at 500 °C for 3 h. Sodium tungstate and bismuth nitrate were then added to synthesize... .

[0025] Table 1: As shown in Table 1, the composite material obtained by this invention has more strong absorption edges in the low-energy radiation range, which is beneficial to enhancing the photoelectric absorption effect of the composite material and thus enhancing the radiation shielding performance.

[0026] Depend on Figure 1 It is known that the material prepared by the present invention has a lower density, which reduces weight and increases wearing comfort compared to traditional radiation protection materials.

[0027] This invention provides a method for preparing barium tantalum-tungsten bismuthate with X-ray absorption function and its application. Through the synergistic doping of tantalum, tungsten, and bismuth in bismuth, tantalum, and tungsten compounds, a multi-layered complementary K-absorption edge system is constructed in a barium bismuthate matrix. Specifically, it involves elemental doping. The K absorption edge of the W element is 69.5 keV. The absorption edge of Bi element K is 90.5keV, and the absorption edge of Ta element is about 67.4keV. When the three are superimposed, they form a continuous strong absorption range in the range of 37-91keV, which perfectly covers the range of 40-70keV of the main energy band of medical CT.

[0028] Compared to traditional lead-based materials, this material avoids environmental risks while broadening the effective absorption energy range, solving the shielding gap caused by the sharp drop in absorption coefficient outside the absorption edge of a single component, and achieving atomic-level uniform substitution through hydrothermal reaction in a polar solvent, forming... The perovskite-like structure, rather than a physical mixture, ensures the ideal superposition of absorption cross sections of multiple elements rather than their mutual weakening. Subsequent washing-drying-calcination processes further regulate crystallinity and phase purity, resulting in nanoparticles with high specific surface area and dispersibility. These nanoparticles can be adapted to various carriers such as coatings and fibers to produce X-ray protection materials, achieving customized shielding performance. They also possess three core advantages: high atomic number synergy, continuous energy level matching, and process scalability.

[0029] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit the scope of protection of the present invention. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the essence and scope of the technical solutions of the present invention.

Claims

1. A method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function, characterized in that, Includes the following steps: The molar masses of each raw material are as follows: bismuth compound 0.2-0.5 mol, tantalum compound 0.2-0.5 mol, barium salt 0.1-0.2 mol, and tungsten compound 0.1-0.2 mol. Dissolve the above raw materials in 500-2000 mL of a polar solvent and carry out a hydrothermal reaction; The precursor obtained above was washed with distilled water and anhydrous ethanol alternately to remove impurities, and then dried. Finally, through calcination, it eventually forms Nanoparticles.

2. The method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function as described in claim 1, characterized in that, The bismuth compound includes one or more of bismuth oxychloride, bismuth nitrate, and bismuth chloride; the tantalum compound includes one or more of sodium tantalate and tantalum chloride; the barium salt includes one or more of barium chloride, barium nitrate, and barium acetate; and the tungsten compound includes one or more of sodium tungstate and tungsten chloride.

3. The method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function as described in claim 1, characterized in that, The polar solvent includes one of deionized water, ethanol, and ethylene glycol.

4. The method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function as described in claim 1, characterized in that, The hydrothermal reaction temperature is 180℃-280℃, and the reaction time is 12-36h.

5. The method for preparing barium tantalum-doped bismuth tungstate with X-ray absorption function as described in claim 1, characterized in that, The calcination is carried out in a muffle furnace at a temperature of 300-600℃ for 2-5 hours.

6. The application of barium tantalum tungstenate as described in any one of claims 1-5 in X-ray protection materials, characterized in that, Will Nanoparticles are added as X-ray absorbers and fillers to X-ray protective materials. The proportion of nanoparticles is 10-40 wt%.

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