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Porous structured bismuth titanate microsphere, preparation method and application thereof

A porous structure, bismuth titanate technology, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of small specific surface area of ​​materials, uncontrollable morphology, The preparation cost is high, and the preparation process is simple, the structure is easy to control, and the operation is convenient.

Inactive Publication Date: 2009-05-13
SHANGHAI NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the currently widely used preparation methods still have shortcomings such as complex process, high preparation cost, small material specific surface area, and uncontrollable morphology. Therefore, new methods need to be explored to prepare new visible light catalytic materials with large specific surface area and controllable structure. Provide new processes and new materials to further improve photocatalytic efficiency

Method used

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  • Porous structured bismuth titanate microsphere, preparation method and application thereof
  • Porous structured bismuth titanate microsphere, preparation method and application thereof
  • Porous structured bismuth titanate microsphere, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 3g surfactant F127 (EO 106 PO 70 EO 106 , Aldrich) was dissolved in 40ml deionized water, and 12g bismuth nitrate pentahydrate (0.025mol) was dissolved in 60ml glacial acetic acid, then the above two solutions were mixed and stirred evenly, 8.5ml n-butyl titanate (0.025mol) was added and Mix well to obtain a sprayed precursor solution.

[0031] The structure of the spray drying equipment is as follows: figure 1 As shown, it includes an atomizer 1 , a tube furnace 2 , a quartz tube 3 and a filter 4 . The tube furnace jacket is used for heating outside the quartz tube. The outlet of the atomizer is connected to the quartz tube. The carrier gas and precursor solution are atomized and enter the quartz tube. The other end of the quartz tube is connected to the filter; the function of the filter is to collect Particles formed after spray drying.

[0032] Nitrogen was used as the carrier gas at a flow rate of 4 L / min. The solution was passed through the nebulizer to form ...

Embodiment 2

[0035] Dissolve 12g of bismuth nitrate pentahydrate in a mixed solution of 40ml of deionized water and 60ml of glacial acetic acid and stir until completely dissolved, and the rest of the steps are the same as described in Example 1.

[0036] The obtained sample can be determined to be Bi by X-ray diffraction pattern 2 Ti 2 o 7 ; It can be determined that the obtained sample has a mesoporous structure through the nitrogen absorption-desorption isotherm, and the calculation shows that the pore diameter of the obtained sample is 17.8nm, and the pore volume is 0.06cm 3 / g, the specific surface area is 8.9m 2 / g; It can be seen by SEM scanning and TEM that the obtained sample is a microsphere with a porous structure, and the particle size is 0.5-2.0 μm.

Embodiment 3

[0038] 2g of surfactant F127 and 12g of bismuth nitrate pentahydrate were dissolved in 30ml of deionized water and 70ml of glacial acetic acid respectively, and the remaining contents were the same as those described in Example 1.

[0039] The obtained sample can be determined to be Bi by X-ray diffraction pattern 2 Ti 2 o 7 ; It can be determined that the obtained sample has a mesoporous structure through the nitrogen absorption-desorption isotherm, and the calculation shows that the pore diameter of the obtained sample is 23.6nm, and the pore volume is 0.09cm 3 / g, the specific surface area is 10.4m 2 / g; It can be seen by SEM and TEM that the obtained sample is a microsphere with a porous structure, and the particle size is 0.5-2.0 μm.

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Abstract

The invention discloses a bismuth titanate microsphere with a porous structure, as well as a preparation method and the application thereof. The porous-structure bismuth titanate microsphere is characterized in that the molecular formula thereof is Bi2Ti2O7, the grain diameter thereof is 0.5-2.0 Mum, the aperture thereof is 3.1-23.8 nm, the pore volume thereof is 0.02-0.20 cm<3> / g, and the specific surface area thereof is 8.4-47.1 m<2> / g. The preparation method comprises the following steps: using glacial acetic acid of bismuth salt or a glycerin solution, a surface active agent aqueous solution and titaniumivbutoxide or titanyl sulfate to form a precursor solution, in which the spray drying technique is applied to obtain a porous-structure bismuth titanate photocatalyst. The porous-structure bismuth titanate obtained can effectively degrade organic pollutants such as para-chlorophenol and the like through photocatalysis in visible light, so that the porous-structure bismuth titanate has a potential prospect of application. The invention has the advantages of easy attainment of raw materials, low preparation cost, simple process and easy control of conditions, and meanwhile provides a preparation process, from which synthesis of other photocatalyst materials can draw on experience.

Description

technical field [0001] The invention relates to the field of materials and catalysts, especially the field of visible light catalysts, and in particular to a bismuth titanate microsphere with a porous structure, a preparation method and application thereof. Background technique [0002] Bi 2 Ti 2 o 7 is A with a pyrochlore structure 2 B 2 o 7 The crystal structure is composed of Ti-O octahedron and Bi-O tetrahedron. Because Bi 2 Ti 2 o 7 TiO exists in the crystal 6 octahedral units, thus attracting extensive research interest in their photochemical properties. For example, Kudo et al. reported the preparation of Bi 2 Ti 2 o 7 , and applied it in the photolysis of water; Yao et al. reported the preparation of Bi by chemical solution decomposition technology 2 Ti 2 o 7 , and apply it to the degradation of organic pollutants. However, the currently widely used preparation methods still have shortcomings such as complex process, high preparation cost, small mate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J21/06B01J35/08B01J35/10
Inventor 霍宇凝张怡蔡陈灵李和兴
Owner SHANGHAI NORMAL UNIVERSITY
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