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A kind of preparation method of monoclinic truncated octahedral bismuth vanadate crystal

A technology of octahedron and bismuth vanadate, which is applied in the field of new energy material preparation, can solve the problems of low purity and poor physical properties, and achieve the effect of high purity and good photocatalytic performance

Active Publication Date: 2020-03-17
XIDIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the prepared samples have poor physical properties and low purity

Method used

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  • A kind of preparation method of monoclinic truncated octahedral bismuth vanadate crystal
  • A kind of preparation method of monoclinic truncated octahedral bismuth vanadate crystal
  • A kind of preparation method of monoclinic truncated octahedral bismuth vanadate crystal

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Embodiment 1

[0039] A preparation method of monoclinic truncated octahedral bismuth vanadate crystals, the steps are as follows:

[0040] Step 1. Add 0.5ml-4ml of fluoride ion solution into nitric acid solution to prepare solution D; wherein, in the fluoride ion solution, the concentration of fluoride ion is 0.5mol / L.

[0041] Specifically, take 1ml-2ml concentrated nitric acid and 18ml-20ml deionized water respectively;

[0042] Specifically, 1ml-2ml of concentrated nitric acid and 18ml-20ml of deionized water are respectively taken.

[0043] Slowly add 1ml to 2ml of concentrated nitric acid into 18ml to 20ml of deionized water, stir magnetically while adding, and obtain a nitric acid solution after cooling.

[0044] Take 0.5ml-4ml of fluoride ion solution, add it into the prepared nitric acid solution, and stir it by magnetic force to prepare solution D.

[0045] The fluoride ion solution may be one of sodium fluoride solution, potassium fluoride solution, ammonium fluoride solution or...

Embodiment 2

[0079] See figure 1 , Figure 2a-2b and image 3 , figure 1 XRD pattern of monoclinic truncated octahedral bismuth vanadate crystals prepared when the molar ratio of fluoride ions to bismuth ions is 1:4; Figure 2a-2b SEM image of monoclinic truncated octahedral bismuth vanadate crystals prepared when the molar ratio of fluoride ions to bismuth ions is 1:4; image 3 The photocatalytic activity curve of the monoclinic truncated octahedral bismuth vanadate crystals prepared when the molar ratio of fluoride ions to bismuth ions is 1:4.

[0080] A preparation method of monoclinic truncated octahedral bismuth vanadate crystals, the steps are as follows:

[0081] Step 1: Mix 1ml of concentrated nitric acid with 19ml of deionized water to prepare a nitric acid solution.

[0082] Specifically, take 1ml of concentrated nitric acid and 19ml of deionized water respectively;

[0083] Slowly add 1ml of concentrated nitric acid into 19ml of deionized water, stir magnetically while add...

Embodiment 3

[0122] See Figure 4 , Figures 5a-5b and Figure 6 , Figure 4 XRD pattern of monoclinic truncated octahedral bismuth vanadate crystals prepared when the molar ratio of fluoride ions to bismuth ions is 1:1; Figures 5a-5b SEM image of monoclinic truncated octahedral bismuth vanadate crystals prepared when the molar ratio of fluoride ions to bismuth ions is 1:1; Figure 6 The photocatalytic activity versus time curve of the monoclinic truncated octahedral bismuth vanadate crystals prepared when the molar ratio of fluoride ions to bismuth ions is 1:1.

[0123] This embodiment provides another method for preparing monoclinic truncated octahedral bismuth vanadate crystals. The difference between this embodiment and Embodiment 2 is that:

[0124] In this embodiment, the 0.5ml sodium fluoride solution in Step 2 in Example 2 is replaced with 2ml;

[0125] Correspondingly in this example, the molar ratio of fluoride ions to bismuth ions in solution A in step 3 of Example 2 is 1:...

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Abstract

The invention relates to a preparing method of a monoclinic phase truncated octahedron bismuth vanadate crystal. The method comprises the steps of obtaining a solution A through bismuth nitrate pentahydrate, a nitric acid solution and a fluorinion solution; obtaining a solution B through ammonium metavanadate and a sodium hydroxide solution; obtaining a solution C through the solution A and the solution B; conducting a microwave hydrothermal reaction on the solution C to obtain a crystal sample; cleaning and drying the crystal sample to obtain the monoclinic phase truncated octahedron bismuthvanadate crystal. According to the preparing method, the microwave hydrothermal reaction is adopted for preparing the bismuth vanadate crystal, and by controlling the mole ratio of fluorine ions to bismuth ions, the reaction temperature, the reaction time and other parameters, the bismuth vanadate crystal with a monoclinic phase truncated octahedron is prepared and synthesized; the prepared crystal has the advantages of being high in purity and good in photocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of preparation of new energy materials, and in particular relates to a method for preparing monoclinic truncated octahedral bismuth vanadate crystals. Background technique [0002] In the past many years, researchers have devoted themselves to the traditional photocatalyst TiO by means of noble metal deposition, ion doping, dye sensitization, and compound semiconductors. 2 Make modifications. But at the same time, there are recombination of photogenerated electrons and holes in the reaction process, and low photocatalytic quantum efficiency, which greatly limits its wide application. Researchers have also developed many non-TiO 2 Type catalysts, such as ZnO, silver phosphate, sulfide, bismuth compounds and other representative materials. [0003] The electronic structure of Bi-based photocatalytic materials is unique, and the valence band is formed by the hybridization of Bi-6s and O-2p orbitals. This un...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G31/00
CPCC01G31/00C01P2002/72C01P2004/03C01P2006/80
Inventor 姜海青户佳林李培咸周小伟张妍贾锦超
Owner XIDIAN UNIV
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