CN105967749A - A kind of preparation method of metastable state Bi2SiO5 porous material - Google Patents
A kind of preparation method of metastable state Bi2SiO5 porous material Download PDFInfo
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- 239000011148 porous material Substances 0.000 title claims abstract description 35
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 108
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000002270 dispersing agent Substances 0.000 claims abstract description 18
- 239000000843 powder Substances 0.000 claims abstract description 17
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 16
- 238000000034 method Methods 0.000 claims abstract description 16
- 229910000416 bismuth oxide Inorganic materials 0.000 claims abstract description 14
- TYIXMATWDRGMPF-UHFFFAOYSA-N dibismuth;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Bi+3].[Bi+3] TYIXMATWDRGMPF-UHFFFAOYSA-N 0.000 claims abstract description 14
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910017604 nitric acid Inorganic materials 0.000 claims abstract description 11
- 239000002202 Polyethylene glycol Substances 0.000 claims abstract description 9
- 229920001223 polyethylene glycol Polymers 0.000 claims abstract description 9
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 claims abstract description 8
- FEWJPZIEWOKRBE-JCYAYHJZSA-N Dextrotartaric acid Chemical compound OC(=O)[C@H](O)[C@@H](O)C(O)=O FEWJPZIEWOKRBE-JCYAYHJZSA-N 0.000 claims abstract description 7
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 claims abstract description 7
- FEWJPZIEWOKRBE-UHFFFAOYSA-N Tartaric acid Natural products [H+].[H+].[O-]C(=O)C(O)C(O)C([O-])=O FEWJPZIEWOKRBE-UHFFFAOYSA-N 0.000 claims abstract description 7
- 239000002253 acid Substances 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 239000011975 tartaric acid Substances 0.000 claims abstract description 7
- 235000002906 tartaric acid Nutrition 0.000 claims abstract description 7
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 15
- 239000000463 material Substances 0.000 claims description 15
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 10
- 150000002500 ions Chemical class 0.000 claims description 10
- 238000003756 stirring Methods 0.000 claims description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- BDZGJPFBTVYBOA-UHFFFAOYSA-N ethene Chemical group C=C.C=C.C=C.C=C.C=C BDZGJPFBTVYBOA-UHFFFAOYSA-N 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000908 ammonium hydroxide Substances 0.000 abstract 2
- 238000000465 moulding Methods 0.000 abstract 2
- 229960001484 edetic acid Drugs 0.000 abstract 1
- 230000000694 effects Effects 0.000 description 3
- 238000001879 gelation Methods 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000002425 crystallisation Methods 0.000 description 2
- 230000008025 crystallization Effects 0.000 description 2
- 229960000935 dehydrated alcohol Drugs 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005187 foaming Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
- 239000011858 nanopowder Substances 0.000 description 2
- 229940057838 polyethylene glycol 4000 Drugs 0.000 description 2
- 229940093429 polyethylene glycol 6000 Drugs 0.000 description 2
- 229910015902 Bi 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910001451 bismuth ion Inorganic materials 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000005469 granulation Methods 0.000 description 1
- 230000003179 granulation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 229940068918 polyethylene glycol 400 Drugs 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- -1 silicon ions Chemical class 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
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Abstract
Description
技术领域technical field
本发明属于材料技术领域，特别涉及一种亚稳态Bi2SiO5多孔材料的制备方法。 The invention belongs to the technical field of materials, in particular to a method for preparing a metastable Bi2SiO5 porous material.
背景技术Background technique
Bi2SiO5是Bi2O3-SiO2系统中摩尔比为1∶1的亚稳定相化合物，Bi2SiO5属正交晶系的Cmc21空间群，其结构可以看作是由[Bi2O2]2+层分隔开的孤立的[SiO3]2-链所构成,因此结构式也可写成Bi4[O4][Si2O6]。正因为Bi2SiO5具有以上结构，其主要具有介电、热电以及非线性光学等性质,其非中心对称的晶体结构还使其有可能具有铁电性质。多孔陶瓷由于其多孔的结构，当孔隙小而分布均匀时，可使多孔陶瓷的比表面积大大增大，活性增强。相比于多孔纳米粉体材料，由于纳米粉体材料的表面断键数较多，比表面积增大，使纳米颗粒间易相互团聚，纳米颗粒越小，则表面活性越大，团聚越严重。如果多孔材料中的细孔分布均匀，则可解决这个问题，且保持了较高的比表面积和表面活性。Bi 2 SiO 5 is a metastable phase compound with a molar ratio of 1:1 in the Bi 2 O 3 -SiO 2 system. Bi 2 SiO 5 belongs to the Cmc21 space group of the orthorhombic crystal system, and its structure can be regarded as composed of [Bi 2 It is composed of isolated [SiO 3 ] 2- chains separated by O 2 ] 2+ layers, so the structural formula can also be written as Bi 4 [O 4 ][Si 2 O 6 ]. Because Bi 2 SiO 5 has the above structure, it mainly has dielectric, pyroelectric and nonlinear optical properties, and its non-centrosymmetric crystal structure also makes it possible to have ferroelectric properties. Due to the porous structure of porous ceramics, when the pores are small and evenly distributed, the specific surface area of porous ceramics can be greatly increased and the activity can be enhanced. Compared with porous nano-powder materials, due to the large number of broken bonds on the surface of nano-powder materials and the increase in specific surface area, the nanoparticles are easy to agglomerate with each other. The smaller the nanoparticles, the greater the surface activity and the more serious the agglomeration. If the pores in the porous material are evenly distributed, this problem can be solved, and the specific surface area and surface activity can be kept high.
发明内容Contents of the invention
为了克服上述现有技术的缺点，本发明的目的在于提供一种亚稳态Bi2SiO5多孔材料的制备方法，具有生产工艺简单、设备要求简单、周期短的特点。In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method for preparing a metastable Bi 2 SiO 5 porous material, which has the characteristics of simple production process, simple equipment requirements and short cycle time.
为了实现上述目的，本发明采用的技术方案是：In order to achieve the above object, the technical scheme adopted in the present invention is:
一种亚稳态Bi2SiO5多孔材料的制备方法，包括如下步骤：A method for preparing a metastable Bi 2 SiO 5 porous material, comprising the steps of:
(1)将柠檬酸溶于氨水中得到柠檬酸溶液A，将氧化铋溶于硝酸中反应形成溶液B；(1) dissolving citric acid in ammonia water to obtain citric acid solution A, dissolving bismuth oxide in nitric acid and reacting to form solution B;
(2)量取1/3的柠檬酸溶液A，将正硅酸乙酯溶于其中形成溶液C；将溶液B溶于剩余柠檬酸溶液A中形成溶液D；(2) Measure 1/3 of citric acid solution A, dissolve ethyl orthosilicate therein to form solution C; dissolve solution B in remaining citric acid solution A to form solution D;
(3)将分散剂加入溶液D中，再加入溶液C和无水乙醇搅拌溶解，之后调节pH值至1～3即获得溶胶E；(3) Add the dispersant to solution D, then add solution C and absolute ethanol and stir to dissolve, then adjust the pH value to 1-3 to obtain sol E;
(4)将溶胶E于80～85℃下水浴1～3h至凝胶化，再在140～160℃下干燥形成干凝胶，室温下自然晾干后进行研磨过筛得到干凝胶粉体；(4) Put sol E in a water bath at 80-85°C for 1-3 hours until gelatinized, then dry at 140-160°C to form xerogel, dry it naturally at room temperature, grind and sieve to obtain xerogel powder ;
(5)将过筛后的干粉直接干压成型，形成块状坯体材料，最后将块状坯体材料进行热处理得到亚稳态Bi2SiO5多孔材料。(5) The sieved dry powder is directly dry-pressed to form a block-shaped green body material, and finally the block-shaped green body material is heat-treated to obtain a metastable Bi 2 SiO 5 porous material.
所述步骤(1)中，氨水的量以能溶解柠檬酸为准，硝酸的量以能完全溶解氧化铋为准。In the step (1), the amount of ammonia water is based on the ability to dissolve citric acid, and the amount of nitric acid is based on the ability to completely dissolve bismuth oxide.
所述正硅酸乙酯和氧化铋的用量满足Bi与Si的摩尔比为(1：2)～(1：5)，且Si离子与Bi离子之和与步骤(1)中柠檬酸的摩尔比为1：(0.5～1.0)。The consumption of described tetraethyl orthosilicate and bismuth oxide satisfies the molar ratio of Bi and Si is (1:2)～(1:5), and the sum of Si ion and Bi ion and the molar amount of citric acid in step (1) The ratio is 1:(0.5～1.0).
所述步骤(2)中，所述分散剂由乙二胺四乙酸、柠檬酸、二乙烯三胺五羧酸、酒石酸、乙二醇和聚乙二醇组成。In the step (2), the dispersant is composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol and polyethylene glycol.
所述分散剂加入溶液D后，分散剂各组份的浓度范围均为0～1.0mol/L。After the dispersant is added to the solution D, the concentration range of each component of the dispersant is 0-1.0 mol/L.
所述步骤(2)中，无水乙醇的体积是氨水体积的1/3～1/2。In the step (2), the volume of absolute ethanol is 1/3-1/2 of the volume of ammonia water.
所述步骤(4)中，所述热处理是在ZnO粉体中进行埋烧，温度为600℃～700℃。In the step (4), the heat treatment is to bury the ZnO powder at a temperature of 600°C to 700°C.
与现有技术相比，本发明的有益效果是：本发明提供的亚稳态Bi2SiO5多孔材料的制备方法中，以乙二胺四乙酸、柠檬酸、二乙烯三胺五羧酸、酒石酸、乙二醇、聚乙二醇(如聚乙二醇400、聚乙二醇4000、聚乙二醇6000)等作为分散剂直接进行络合发泡的凝胶化过程，通过控制各物质的浓度，特别是各分散剂的用量，干燥后所形成的中间粉体物质可直接成型成块状材料，在这个制备方法中，不仅利用分散剂使铋离子和硅离子均匀地存在于体系中，使亚稳态Bi2SiO5多孔材料的结晶和复合过程更加均匀，而且减少造粒、陈腐的过程，使结晶过程与烧结一步完成，这都使制备周期缩短，成本降低。结合埋烧的热处理过程，利用有机物的发泡和分解燃烧过程形成亚稳态Bi2SiO5多孔材料，可获得开孔的亚稳态Bi2SiO5多孔材料。Compared with the prior art, the beneficial effects of the present invention are: in the preparation method of the metastable state Bi 2 SiO 5 porous material provided by the present invention, ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, Tartaric acid, ethylene glycol, polyethylene glycol (such as polyethylene glycol 400, polyethylene glycol 4000, polyethylene glycol 6000), etc. are used as dispersants to directly carry out the gelation process of complex foaming. The concentration, especially the amount of each dispersant, the intermediate powder material formed after drying can be directly formed into a block material. In this preparation method, not only the dispersant is used to make bismuth ions and silicon ions evenly exist in the system , make the crystallization and composite process of the metastable Bi 2 SiO 5 porous material more uniform, and reduce the process of granulation and staleness, so that the crystallization process and sintering can be completed in one step, which shortens the preparation cycle and reduces the cost. Combined with the heat treatment process of burial, the metastable Bi 2 SiO 5 porous material is formed by the foaming and decomposition combustion process of organic matter, and the metastable Bi 2 SiO 5 porous material with open pores can be obtained.
具体实施方式detailed description
下面结合实施例详细说明本发明的实施方式。The implementation of the present invention will be described in detail below in conjunction with the examples.
实施例1Example 1
一种亚稳态Bi2SiO5多孔材料的制备方法，包括如下步骤：A method for preparing a metastable Bi 2 SiO 5 porous material, comprising the steps of:
(1)将柠檬酸溶于氨水中形成柠檬酸溶液A，氨水的量以能溶解柠檬酸为准；将氧化铋溶于硝酸中反应形成溶液B，硝酸以能完全溶解氧化铋为准。(1) Dissolving citric acid in ammonia water to form citric acid solution A, the amount of ammonia water is based on the ability to dissolve citric acid; dissolving bismuth oxide in nitric acid to form solution B, and the nitric acid is based on the ability to completely dissolve bismuth oxide.
(3)量取1/3的溶液A，将正硅酸乙酯溶于其中形成溶液C；将溶液B溶于剩余柠檬酸溶液中形成溶液D，其中，Bi：Si(摩尔比)＝1：2，Si离子与Bi离子之和：柠檬酸(摩尔比)＝1：0.5。(3) Measure 1/3 of solution A, dissolve ethyl orthosilicate therein to form solution C; dissolve solution B in the remaining citric acid solution to form solution D, wherein, Bi:Si (molar ratio)=1 : 2, the sum of Si ions and Bi ions: citric acid (molar ratio) = 1: 0.5.
(3)称量一定量的分散剂(由乙二胺四乙酸、柠檬酸、二乙烯三胺五羧酸、酒石酸、乙二醇、聚乙二醇组成，其中聚乙二醇又包括聚乙二醇400、聚乙二醇4000和聚乙二醇6000。)加入溶液D中，分散剂各组份的浓度控制在1.0mol/L，加入溶液C和无水乙醇搅拌溶解(无水乙醇的体积是氨水体积的1/3)，之后调节pH值至1～3即获得溶胶E。(3) Weigh a certain amount of dispersant (made up of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol, wherein polyethylene glycol includes polyethylene glycol Glycol 400, Polyethylene Glycol 4000 and Polyethylene Glycol 6000.) Add in solution D, the concentration of each component of dispersant is controlled at 1.0mol/L, add solution C and dehydrated alcohol and stir to dissolve (dehydrated alcohol's The volume is 1/3 of the volume of ammonia water), and then the pH value is adjusted to 1-3 to obtain Sol E.
(4)将溶胶E于80℃下水浴1～3h至凝胶化，然后在140℃下干燥形成干凝胶，室温下自然晾干后将粉体进行研磨过筛。(4) Put sol E in a water bath at 80°C for 1-3 hours until gelation, and then dry at 140°C to form a xerogel. After drying naturally at room temperature, grind and sieve the powder.
(5)将过筛后的干粉直接干压成形，形成块状坯体材料，最后将块状坯体材料在ZnO粉体中进行埋烧即获得亚稳态Bi2SiO5多孔材料，热处理温度为600℃。所得亚稳态Bi2SiO5多孔材料中为开孔结构，晶粒尺寸约为150nm～500nm，间隙尺寸为80nm～200nm。(5) The sieved dry powder is directly dry-pressed to form a block-shaped green body material, and finally the block-shaped green body material is buried in ZnO powder to obtain a metastable Bi 2 SiO 5 porous material, and the heat treatment temperature is is 600°C. The obtained metastable Bi 2 SiO 5 porous material has an open-pore structure, the grain size is about 150nm-500nm, and the gap size is 80nm-200nm.
实施例2Example 2
一种亚稳态Bi2SiO5多孔材料的制备方法，包括如下步骤：A method for preparing a metastable Bi 2 SiO 5 porous material, comprising the steps of:
(1)将柠檬酸溶于氨水中形成柠檬酸溶液A，氨水的量以能溶解柠檬酸为准；将氧化铋溶于硝酸中反应形成溶液B，硝酸以能完全溶解氧化铋为准。(1) Dissolving citric acid in ammonia water to form citric acid solution A, the amount of ammonia water is based on the ability to dissolve citric acid; dissolving bismuth oxide in nitric acid to form solution B, and the nitric acid is based on the ability to completely dissolve bismuth oxide.
(3)量取1/3的溶液A，将正硅酸乙酯溶于其中形成溶液C；将溶液B溶于剩余柠檬酸溶液中形成溶液D，其中，Bi：Si(摩尔比)＝1：5的比例，Si离子与Bi离子之和：柠檬酸(摩尔比)＝1：1。(3) Measure 1/3 of solution A, dissolve ethyl orthosilicate therein to form solution C; dissolve solution B in the remaining citric acid solution to form solution D, wherein, Bi:Si (molar ratio)=1 : The ratio of 5, the sum of Si ions and Bi ions: citric acid (molar ratio) = 1:1.
(3)称量一定量的分散剂(由乙二胺四乙酸、柠檬酸、二乙烯三胺五羧酸、酒石酸、乙二醇、聚乙二醇组成。)加入溶液D中，分散剂各组份的浓度控制在1.0mol/L，加入溶液C和无水乙醇搅拌溶解(无水乙醇的体积是氨水体积的1/2)，之后调节pH值至1～3即获得溶胶E。(3) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol.) Add in solution D, each dispersant The concentration of the components is controlled at 1.0 mol/L, add solution C and absolute ethanol and stir to dissolve (the volume of absolute ethanol is 1/2 of the volume of ammonia water), and then adjust the pH value to 1-3 to obtain Sol E.
(4)将溶胶E于85℃下水浴1～3h至凝胶化，然后在140℃下干燥形成干凝胶，室温下自然晾干后将粉体进行研磨过筛。(4) Put the sol E in a water bath at 85°C for 1-3 hours to gel, then dry at 140°C to form a xerogel, dry it naturally at room temperature, and then grind and sieve the powder.
(5)将过筛后的干粉直接干压成形，形成块状坯体材料，最后将块状坯体材料在ZnO粉体中进行埋烧即获得亚稳态Bi2SiO5多孔材料，热处理温度为700℃。所得亚稳态Bi2SiO5多孔材料中为开孔结构，晶粒尺寸约为150nm～500nm，间隙尺寸为80nm～200nm。(5) The sieved dry powder is directly dry-pressed to form a block-shaped green body material, and finally the block-shaped green body material is buried in ZnO powder to obtain a metastable Bi 2 SiO 5 porous material, and the heat treatment temperature is is 700°C. The obtained metastable Bi 2 SiO 5 porous material has an open-pore structure, the grain size is about 150nm-500nm, and the gap size is 80nm-200nm.
实施例3Example 3
一种亚稳态Bi2SiO5多孔材料的制备方法，包括如下步骤：A method for preparing a metastable Bi 2 SiO 5 porous material, comprising the steps of:
(1)将柠檬酸溶于氨水中形成柠檬酸溶液A，氨水的量以能溶解柠檬酸为准；将氧化铋溶于硝酸中反应形成溶液B，硝酸以能完全溶解氧化铋为准。(1) Dissolving citric acid in ammonia water to form citric acid solution A, the amount of ammonia water is based on the ability to dissolve citric acid; dissolving bismuth oxide in nitric acid to form solution B, and the nitric acid is based on the ability to completely dissolve bismuth oxide.
(3)量取1/3的溶液A，将正硅酸乙酯溶于其中形成溶液C；将溶液B溶于剩余柠檬酸溶液中形成溶液D，其中，Bi：Si(摩尔比)＝1：3的比例，Si离子与Bi离子之和：柠檬酸(摩尔比)＝1：0.8。(3) Measure 1/3 of solution A, dissolve ethyl orthosilicate therein to form solution C; dissolve solution B in the remaining citric acid solution to form solution D, wherein, Bi:Si (molar ratio)=1 : The ratio of 3, the sum of Si ions and Bi ions: citric acid (molar ratio) = 1: 0.8.
(3)称量一定量的分散剂(由乙二胺四乙酸、柠檬酸、二乙烯三胺五羧酸、酒石酸、乙二醇、聚乙二醇组成。)加入溶液D中，分散剂各组份的浓度控制在0.01、0.1、0.1、0.5、0.5、1.0mol/L，加入溶液C和无水乙醇搅拌溶解(无水乙醇的体积是氨水体积的1/2)，之后调节pH值至1～3即获得溶胶E。(3) Weigh a certain amount of dispersant (composed of ethylenediaminetetraacetic acid, citric acid, diethylenetriaminepentacarboxylic acid, tartaric acid, ethylene glycol, polyethylene glycol.) Add in solution D, each dispersant The concentration of the components is controlled at 0.01, 0.1, 0.1, 0.5, 0.5, 1.0mol/L, add solution C and absolute ethanol and stir to dissolve (the volume of absolute ethanol is 1/2 of the volume of ammonia water), and then adjust the pH value to 1 to 3 to obtain Sol E.
(4)将溶胶E于80℃～85℃下水浴1～3h至凝胶化，然后在140℃～160℃下干燥形成干凝胶，室温下自然晾干后将粉体进行研磨过筛。(4) Put sol E in a water bath at 80°C-85°C for 1-3 hours until gelation, then dry at 140°C-160°C to form xerogel, dry naturally at room temperature, grind and sieve the powder.
(5)将过筛后的干粉直接干压成形，形成块状坯体材料，最后将块状坯体材料在ZnO粉体中进行埋烧即获得亚稳态Bi2SiO5多孔材料，热处理温度为600℃。所得亚稳态Bi2SiO5多孔材料中为开孔结构，晶粒尺寸约为150nm～500nm，间隙尺寸为80nm～200nm。(5) The sieved dry powder is directly dry-pressed to form a block-shaped green body material, and finally the block-shaped green body material is buried in ZnO powder to obtain a metastable Bi 2 SiO 5 porous material, and the heat treatment temperature is is 600°C. The obtained metastable Bi 2 SiO 5 porous material has an open-pore structure, the grain size is about 150nm-500nm, and the gap size is 80nm-200nm.
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