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Preparation method of dumbbell-shaped bismuth vanadate

A technology of bismuth vanadate and dumbbells is applied in the field of preparation of new photocatalysts, which can solve the problems of undiscovered preparation methods of dumbbell-shaped bismuth vanadate, and achieve controllable morphology and crystal phase, mild conditions and good repeatability. Effect

Active Publication Date: 2012-06-13
江苏全泽环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] But so far, do not find the report of the specific preparation method of dumbbell-shaped bismuth vanadate, so it is necessary to develop a kind of preparation method of dumbbell-shaped bismuth vanadate with simple process, mild conditions and good reproducibility

Method used

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  • Preparation method of dumbbell-shaped bismuth vanadate
  • Preparation method of dumbbell-shaped bismuth vanadate
  • Preparation method of dumbbell-shaped bismuth vanadate

Examples

Experimental program
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Effect test

Embodiment 1）

[0040] This example prepares dumbbell-shaped BiVO 4 The method has the following steps:

[0041] ①Weigh 20.0205g (0.001mol) of polyethylene glycol 20000 (hereinafter referred to as PEG-20000, CAS No. 25322-68-3) white solid powder into a beaker filled with 200 mL of water, stir magnetically until PEG-20000 20,000 dispersed evenly; then measure 12mL of benzene and add it to the above-mentioned mixed liquid of polyethylene glycol and water, and mix evenly under magnetic stirring to obtain an emulsion. The emulsion is evenly divided into 2 parts as a mixed dispersion medium, and 10.1550 g (0.0209 mol) of bismuth nitrate Bi (NO 3 ) 3 ·5H 2 Colorless crystalline particles of O, magnetically stirred until uniformly dispersed, and obtained Bi(NO 3 ) 3 The mixed liquid; another part was added 2.6348g (0.0225mol) of ammonium metavanadate NH as a dispersed substance 4 VO 3 The white crystalline particles are heated in a water bath to 95°C to disperse them evenly, and the NH-conta...

Embodiment 2）

[0051] This example prepares BiVO 4 The rest of the method is the same as in Example 1, except that in step 3., the time for the reaction solution to carry out the hydrothermal reaction at 170° C. is 6 hours.

[0052] The X-ray powder diffraction pattern of the product is shown in image 3 , strong diffraction peaks appeared at the positions of 18.93°, 28.96°, 39.90° and 53.38°, and BiVO 4 The XRD standard card (JCPDF NO.14-0668) coincides, indicating that the product belongs to the monoclinic scheelite structure, and its unit cell parameters are a=0.5195nm, b=1.1701nm, c=0.5092nm, β=90.38 °. The intensity of diffraction peaks at other positions is weaker, and no other impurity phases appear, indicating that the purity of the sample is higher.

[0053] The SEM photo of the product is shown in Figure 4 , the product has a relatively uniform morphology and good dispersion. The SEM photo of the powder shows that the particles are dumbbell-shaped, and both ends of the dumbbe...

Embodiment 3）

[0056] This example prepares BiVO 4 The method all the other are identical with embodiment 1, difference is: in step 3., the time that reaction solution carries out hydrothermal reaction at 170 ℃ is 16 hours.

[0057] The SEM photo of the product is shown in Figure 5 , the SEM photo of the powder shows that the particles are dumbbell-shaped, and both ends of the dumbbell-shaped particles are cauliflower-shaped. The length of the particle is 6-12 μm, the maximum width of the head is 3-7 μm, and the width of the waist is 3-6 μm.

[0058] Detect the synthesized BiVO according to the method described in Example 1 4 Catalytic performance, the photocatalytic degradation rate of methylene blue is 91.36%.

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Abstract

The invention discloses a preparation method of dumbbell-shaped bismuth vanadate, comprising the following steps of: respectively adding Bi(NO3)3.5H2O and NH4VO3 into benzene or an aqueous solution of benzene and polyethylene glycol to make them dissolve; dripping the NH4VO3-containing mixed solution into a Bi(NO3)2-containing solution with stirring, mixing; adding the reaction solution into a reaction kettle with a polyfluo substrate, carrying out a hydrothermal reaction at 165 DEG C-175 DEG C for 2-30 hours to complete the reaction; cooling the materials to room temperature after the reaction, followed by suction filtration, washing and drying so as to obtain the finished product dumbbell-shaped BiVO4 powder. According to the invention, benzene is taken as a template agent to prepare the bismuth vanadate powder with an obvious dumbbell-shaped structure, and the dumbbell head of the dumbbell-shaped particle is cauliflower-shaped. The preparation method provided by the invention has advantages of controllable morphology and crystal phase of the product, simple technology, mild condition and good repeatability.

Description

technical field [0001] The invention relates to a preparation method of a novel photocatalyst, in particular to a preparation method of a visible light-responsive semiconductor photocatalyst dumbbell-shaped bismuth vanadate. Background technique [0002] Since 1972, Fujishima and Honda (Fujishima A, Honda K. Electrochemical photolysis of water at a semiconductor electrode [J]. Nature, 1972, 238: 37~38) in n-type semiconductor TiO 2 After the discovery of photoelectrocatalytic decomposition of water on electrodes, semiconductor photocatalytic processes have attracted extensive attention in the past nearly four decades due to their ability to photocatalytically produce hydrogen and treat organic pollutants. Among them, in the removal of refractory pollutants in various environmental media, semiconductor photocatalysts have the advantages of strong oxidation, complete mineralization of pollutants, and direct use of sunlight. [0003] TiO 2 is the most thoroughly studied semic...

Claims

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Application Information

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IPC IPC(8): C01G31/00C01G29/00B01J23/22
Inventor 张春勇关明云舒莉文颖频朱炳龙郑纯智单万建张继振
Owner 江苏全泽环保科技有限公司
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