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Bismuth tellurate/bismuth oxide heterojunction material as well as preparation method and application thereof

A bismuth oxide, heterojunction technology, which is applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc. Effects with low equipment requirements

Active Publication Date: 2018-12-21
NANTONG TEXTILE & SILK IND TECH RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since Bi 2 o 3 There is a defect that the recombination of electrons and holes is too fast, which greatly affects the efficiency of its photocatalytic ability

Method used

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  • Bismuth tellurate/bismuth oxide heterojunction material as well as preparation method and application thereof
  • Bismuth tellurate/bismuth oxide heterojunction material as well as preparation method and application thereof
  • Bismuth tellurate/bismuth oxide heterojunction material as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] According to the chemical formula BiTe 3 o 7.5 / Bi 2 o 3 , Bi 2 o 3 with BiTe 3 o 7.5 The molar ratio is 5:100, and the bismuth nitrate Bi(NO 3 ) 3 ·5H 2 O: 1.780 grams, dissolved in dilute nitric acid solution, stirred until completely dissolved to obtain A solution. Then weigh tellurium oxide TeO 2 : 1.596 grams, be dissolved in the citric acid solution that pH value is 1.57, and the solution of gained is B solution.

[0028] Use a dropper to add solution A to solution B drop by drop, stir while adding dropwise, add citric acid or deionized water appropriately, and keep the pH of the mixed solution at about 1.57. Put it into a 60°C water bath and continue to stir for a while until gel appears. After the gel was aged for a period of time, it was placed in an oven and treated at 80°C for 12 hours to obtain a fluffy precursor. Take out the precursor and place it in a clean alumina crucible, calcinate it at 650°C for 8 hours, cool down naturally, take it out...

Embodiment 2

[0034] According to the chemical formula BiTe 3 o 7.5 / Bi 2 o 3 , Bi 2 o 3 with BiTe 3 o 7.5 The molar ratio is 10:100, respectively weigh bismuth oxide Bi 2 o 3 : 0.932 grams, dissolved in nitric acid solution, stirred until fully dissolved to obtain A solution. Then weigh tellurium chloride TeCl 4 : 2.694 grams, be dissolved in the citric acid solution that pH value is 1.5, and the solution of gained is B solution. Use a dropper to add solution A to solution B drop by drop, stir while adding dropwise, add citric acid or deionized water appropriately, and keep the pH of the mixed solution at about 1.5. Put it into an 80°C water bath and continue to stir for a while until gel appears. After aging the gel for a period of time, put it into an oven and bake it at 100°C for 8 hours to obtain a fluffy precursor. Take out the precursor and place it in a clean alumina crucible, calcinate it at 850°C for 4 hours, cool down naturally, take it out and grind it to get BiTe ...

Embodiment 3

[0037] According to the chemical formula BiTe 3 o 7.5 / Bi 2 o 3 , Bi 2 o 3 with BiTe 3 o 7.5 The molar ratio is 1:100, respectively weigh bismuth subcarbonate (BiO) 2 CO 3 : 0.867 gram, be dissolved in dilute nitric acid solution, stir until fully dissolving to obtain A solution. Then weigh tellurium chloride TeCl 4 : 2.694 grams, dissolved in a citric acid solution with a pH value of 2, the resulting solution is B solution. Use a dropper to add solution A to solution B drop by drop, stir while adding dropwise, add citric acid or deionized water appropriately, and keep the pH of the mixed solution at about 2. Put it into a 70°C water bath and continue to stir for a while until gel appears. After the gel was aged for a period of time, it was put into an oven and baked at 90° C. for 10 hours to obtain a fluffy precursor. Take out the precursor and place it in a clean alumina crucible, calcinate at 750°C for 6 hours, cool down naturally, take out and grind to get BiT...

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Abstract

The invention discloses a bismuth tellurate / bismuth oxide heterojunction material as well as a preparation method and application thereof. The chemical general formula of the bismuth tellurate / bismuthoxide heterojunction material provided by the invention is BiTe3O7.5 / Bi2O3, wherein the molar ratio of the Bi2O3 to the BiTe3O7.5 is equal to (1-10) to 100. The bismuth tellurate / bismuth oxide heterojunction material provided by the invention is prepared by using a chemical sol-gel method; the obtained heterojunction material can absorb light within an ultraviolet-visible light range, and can efficiently catalyze the degradation of organic dyes such as methylene blue. Compared with a single-phase BiTe3O7.5 catalyst, the heterojunction photocatalytic material prepared by compounding bismuth tellurate / bismuth oxide can better absorb the visible light and generate a large number of electron-hole pairs, and effectively realizes electron-hole separation, thereby improving the catalytic efficiency.

Description

technical field [0001] The present invention relates to a kind of BiTe 3 o 7.5 / Bi 2 o 3 The heterojunction photocatalytic material and its preparation method and application are especially suitable for degrading organic pollutants, and belong to the field of inorganic photocatalytic materials. Background technique [0002] Since the beginning of this century, resource shortage and environmental problems have been two difficult problems for human beings to get rid of. It has always been the direction we have to work hard to deal with as many pollutants as possible with the least resources. At present, photocatalysis mainly based on semiconductor oxides Technology has become an important means to control environmental pollution because of its excellent properties such as no pollution, simple process, and rapid response to sunlight. The photocatalytic material is driven by the energy of the sun, so that the photocatalytic material generates electron-hole pair separation, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/057B01J37/03C02F1/30C02F101/30C02F101/34C02F101/38
CPCC02F1/30B01J27/0576B01J37/036C02F2305/10C02F2101/30C02F2101/308C02F2101/34C02F2101/38B01J35/39Y02W10/37
Inventor 黄彦林米龙庆秦杰魏东磊
Owner NANTONG TEXTILE & SILK IND TECH RES INST
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