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A calcium-doped β‑bi 2 o 3 Photocatalyst and its preparation method and application

A photocatalyst, -bi2o3 technology, applied in the field of material chemistry, can solve the problem of less photocatalytic materials, and achieve the effects of short production cycle, strong light absorption capacity, and less secondary pollution

Active Publication Date: 2017-02-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] But about calcium-doped β-Bi 2 o 3 There are few literature reports on photocatalytic materials, and further research is needed to enhance their ability to activate visible light on the basis of reasonable control of reaction conditions, improve catalytic efficiency and reuse rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment provides a calcium-doped β-Bi 2 o 3 Photocatalyst, the preparation method of this catalyst comprises the following steps:

[0031] Dissolve 6.96g of block copolymer surfactant Pluronic P-123 in 100mL, 2M nitric acid solution; add 19.73g of bismuth nitrate pentahydrate under stirring; after the bismuth nitrate pentahydrate is completely dissolved, add 0.333g of calcium, stirred until the calcium chloride is completely dissolved to obtain calcium-doped β-Bi 2 o 3 The photocatalyst precursor sol was aged at room temperature for 3 hours under stirring to obtain calcium-doped β-Bi 2 o 3 Photocatalyst precursor solution;

[0032] The above calcium doped β-Bi2 o 3 The photocatalyst precursor solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was sealed and placed in a vacuum oven at 150°C for crystallization for 24 hours to obtain a crystallized product; the crystallized product was Cool to room ...

Embodiment 2

[0035] This embodiment provides a calcium-doped β-Bi 2 o 3 Photocatalyst, the preparation method of this catalyst comprises the following steps:

[0036] Dissolve 8.28g of block copolymer surfactant Pluronic P-123 in 100mL, 0.5M nitric acid solution; add 24g of bismuth nitrate pentahydrate under stirring; after the bismuth nitrate pentahydrate is completely dissolved, add 0.333g of calcium, stirred until the calcium chloride is completely dissolved to obtain calcium-doped β-Bi 2 o 3 The photocatalyst precursor sol was aged at room temperature for 12 hours under stirring to obtain calcium-doped β-Bi 2 o 3 Photocatalyst precursor solution;

[0037] The above calcium doped β-Bi 2 o 3 The photocatalyst precursor solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was sealed and placed in a vacuum oven at 120°C for crystallization for 18 hours to obtain a crystallized product; the crystallized product was Cool to roo...

Embodiment 3

[0040] This embodiment provides a calcium-doped β-Bi 2 o 3 Photocatalyst, the preparation method of this catalyst comprises the following steps:

[0041] Dissolve 8.28g of block copolymer surfactant Pluronic P-123 in 100mL, 3M nitric acid solution; add 15.55g of bismuth nitrate pentahydrate under stirring; after the bismuth nitrate pentahydrate is completely dissolved, add 0.333g of calcium, stirred until the calcium chloride is completely dissolved to obtain calcium-doped β-Bi 2 o 3 The photocatalyst precursor sol was aged at room temperature for 24 hours under stirring to obtain calcium-doped β-Bi 2 o 3 Photocatalyst precursor solution;

[0042] The above calcium doped β-Bi 2 o 3 The photocatalyst precursor solution was transferred to a stainless steel autoclave lined with polytetrafluoroethylene, and the autoclave was sealed and placed in a vacuum oven at 160°C for crystallization for 36 hours to obtain a crystallized product; the crystallized product was Cool to ro...

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Abstract

The invention provides a calcium-doped beta-Bi2O3 photocatalyst as well as a preparation method and application thereof. The preparation method comprises the following steps: dissolving P-123 into a nitric acid solution; adding bismuth nitrate pentahydrate; adding calcium chloride after the bismuth nitrate pentahydrate is completely dissolved, obtaining a precursor sol of the calcium-doped beta-Bi2O3 photocatalyst after the calcium chloride is completely dissolved, and aging the precursor sol to obtain a precursor solution of the calcium-doped beta-Bi2O3 photocatalyst; crystallizing the precursor solution in a sealed manner to obtain a crystallized product; cooling, and performing suction filtration to obtain a calcium bismuth compound; drying to obtain a precursor of the calcium-doped beta-Bi2O3 photocatalyst; calcining the precursor, and cooling and grinding to obtain the calcium-doped beta-Bi2O3 photocatalyst. The calcium-doped beta-Bi2O3 photocatalyst has higher visible light absorption capability and higher sunlight energy utilization efficiency; the preparation method is simple in preparation process, easy to control operating conditions and low in cost.

Description

technical field [0001] The invention relates to a calcium-doped β-Bi 2 o 3 The photocatalyst and its preparation method and application belong to the field of material chemistry and the field of photoelectrochemical method technology. Background technique [0002] With the development of solar chemistry, semiconductor photocatalysis technology has attracted extensive attention in sewage treatment due to its advantages of economical operation cost, thorough oxidation ability, and no secondary pollution. There are valence band and conduction band in the semiconductor photocatalyst, and a forbidden band is formed between the valence band and the conduction band. When the external light energy is greater than its forbidden band width, the electrons in the valence band absorb energy and jump to the conduction band, so that the conduction band generate electrons (e - ), while the valence band loses electrons to generate holes (h + ), the generated holes and electrons have cert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/18C02F1/30
CPCY02W10/37
Inventor 杨雪莹张晓飞吴百春宋磊刘光全彭其勇刘译阳王毅霖罗臻李婷张华李雪凝
Owner PETROCHINA CO LTD
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