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Method for preparing flowerlike bismuth tungstate by hydrothermal process

A hydrothermal method, bismuth tungstate technology, applied in chemical instruments and methods, tungsten compounds, inorganic chemistry, etc., can solve the problems of reducing the specific surface area of ​​substances, high energy, poor dispersion, etc., to achieve good reproducibility and good degradation Effect, low cost effect

Inactive Publication Date: 2014-11-26
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The agglomeration phenomenon of the substance produced by the hydrothermal method is relatively serious, and the dispersion is poor, which will reduce the specific surface area of ​​the substance; while the substance produced by the solid phase method is often formed under high temperature conditions, which requires more energy.

Method used

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  • Method for preparing flowerlike bismuth tungstate by hydrothermal process
  • Method for preparing flowerlike bismuth tungstate by hydrothermal process
  • Method for preparing flowerlike bismuth tungstate by hydrothermal process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Step 1, 1mmol of Bi(NO 3 ) 3 Dissolve in 20ml of deionized water, and form a milky white solution after ultrasonic treatment;

[0029] Step two, the Na of 0.5mmol 2 WO 4 Dissolve in 20ml of deionized water, and after ultrasonic treatment, the solution is mixed evenly, and then the uniformly mixed solution is gradually added dropwise to the milky white solution in step 1, and fully stirred;

[0030] Step 3, use a NaOH solution with a concentration of 1mol / L and dilute H 2 SO 4 Adjust the pH value of the solution obtained in step 2 so that the pH of the solution=1;

[0031] Step 4, add 0.010mol of K in the reaction solution of step 3 2 SO 4 , dissolve and disperse evenly; transfer the reaction system to a 50mL polytetrafluoroethylene-lined reactor, keep it at a constant temperature for 24 hours at 180°C, and then cool naturally to room temperature to obtain a hydrothermal product;

[0032] Step 5: Centrifuge the hydrothermal product obtained in Step 4, wash with a...

Embodiment 2

[0039] The preparation method in the present embodiment is the same as that in Example 1, the difference is only that the conditions in the preparation process are different, the pH=3 of the solution is adjusted in the step 3 of the present embodiment, and 0.030mol potassium sulfate is taken in the step 4 and the reaction temperature is 200 °C, and the rest of the conditions remain unchanged.

[0040] Get the Bi prepared by 0.1g this embodiment 2 WO 6 The photocatalytic degradation test of tetracycline was carried out in the photochemical reaction instrument, and the degradation rate of the tetracycline antibiotic by the photocatalyst was measured to reach 68% within 60 minutes.

Embodiment 3

[0042] The preparation method in this example is the same as that in Example 1, the only difference being that the conditions in the preparation process are different. In step 4, 0.030 mol of potassium sulfate is taken and the reaction temperature is 200° C., and the rest of the conditions remain unchanged.

[0043] Get the Bi prepared by 0.1g this embodiment 2 WO 6 The photocatalytic degradation test of tetracycline was carried out in the photochemical reaction instrument, and the degradation rate of the tetracycline antibiotic by the photocatalyst was measured to reach 70% within 60 minutes.

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Abstract

The invention discloses a method for preparing flowerlike bismuth tungstate by a hydrothermal process, which comprises the following steps: evenly mixing bismuth nitrate, sodium tungstate and potassium sulfate used as raw materials in a mol ratio of 2:1:(20-60), regulating the pH value of the solution, transferring into a reaction kettle to react, carrying out centrifugal separation on the product, washing, and drying to obtain the bismuth tungstate. The bismuth tungstate prepared by the simple hydrothermal reaction is in a micro flower shape, and has the advantages of uniform appearance and favorable dispersity. By utilizing the high-concentration salt environment, the substance has higher dispersity; and meanwhile, the formed bismuth tungstate has the advantages of novel appearance, pure phase, simple synthesis method and the like, and has favorable degradation effect on tetracycline.

Description

technical field [0001] The invention belongs to the technical field of nanomaterial synthesis, and in particular relates to a method for preparing flower rod-shaped bismuth tungstate by a hydrothermal method. Background technique [0002] Bismuth tungstate (Bi 2 WO 6 ) is a bismuth layered perovskite family Bi 2 A n-1 B n o 3n+3 (A=Ca, Sr, Ba, Pb, Bi, Na, K, B=Ti, Nb, Ta, Mo, W, Fe) the simplest oxide, its band gap is 2.75ev, the band structure for W 5d The conduction band consisting of orbitals and the Bi 6s and O 2p Orbital hybridization of valence band composition. Because of its absorption in the visible region, Bi 2 WO 6 It is a promising visible light-responsive semiconductor photocatalytic material. [0003] The catalytic performance of photocatalytic materials has a great relationship with the particle size, crystal form, and specific surface area of ​​the substance. Therefore, synthesizing a photocatalytic material with a relatively large specific surfa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G41/00B82Y40/00B01J23/31A62D3/17A62D101/28
Inventor 关卫省吴亚帆范芳芳
Owner CHANGAN UNIV