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Bismuth phosphate-based heterojunction photocatalyst and preparation method thereof

A photocatalyst, bismuth phosphate-based technology, applied in the field of photocatalysis, can solve the problems of high power consumption, long time, etc., and achieve the effects of improving life, improving efficiency, and increasing specific surface area

Inactive Publication Date: 2020-12-29
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods require reaction synthesis at extremely high temperature, rapid heating rate or long reaction time, and the preparation process has the disadvantages of high power consumption and long time.

Method used

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  • Bismuth phosphate-based heterojunction photocatalyst and preparation method thereof
  • Bismuth phosphate-based heterojunction photocatalyst and preparation method thereof
  • Bismuth phosphate-based heterojunction photocatalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The steps of the bismuth phosphate-based heterojunction photocatalyst prepared in this example are as follows:

[0035] Step 1. BiPO 4 Preparation: Weigh 0.485g Bi(NO 3 ) 3 ·5H 2 O was added to ultrapure water and sonicated until completely dissolved, then 0.156g NaH was added 2 PO 4 2H 2 O was added to the solution and mixed and stirred to obtain a mixed solution. Then, the mixed solution was placed in a microwave device and stirred for 15 minutes. The power was set to 800W. The resulting precipitate was centrifuged at a high speed and dried in an oven at 60°C for 12 hours to obtain BiPO. 4 solid powder.

[0036] Step 2, g-C 3 N 4 Preparation: Weigh 5g of melamine into a crucible, cover and calcinate in a muffle furnace at 550°C for 4h, and set the heating rate at 5°C / min. After taking it out, the light yellow solid obtained after naturally cooling to room temperature was ground into powder with an agate mortar and set aside.

[0037] Step 3, g-C 3 N 4 / BiP...

Embodiment 2

[0039] Other conditions are the same as in Example 1, except that 0.1g, 0.3g, 1g g-C are added respectively 3 N 4 , to test the addition of different amounts of g-C 3 N 4 , for g-C 3 N 4 / BiPO 4 performance impact.

Embodiment 3

[0041] The samples of Example 1 and Example 2 were characterized by XRD, ultraviolet-visible diffuse reflectance, and photocurrent, and the characterization results are shown in figure 1 , figure 2 , image 3 , the percentage content in the figure is g-C 3 N 4 Addition amount and BiPO 4 The mass percentage of the amount added.

[0042] XRD is used to determine the crystal phase structure of the prepared samples. The XRD patterns of photocatalytic materials with different proportions prepared in this experiment are as follows: figure 1 shown. In the figure, for BiPO prepared by microwave method 4 , 19.0°, 21.3°, 25.3°, 27.2°, 29.1°, 31.2°, 34.5° and 36.9° correspond to BiPO 4 (011), (-111), (111), (200), (120), (012), (-202) and (-212) crystal planes, which are also consistent with the standard spectrum library (JCPDS15-0767) The results were consistent. The sharp and intense diffraction peaks of the samples indicate pure BiPO 4 It is highly crystalline. The pure g...

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Abstract

The invention discloses a bismuth phosphate-based heterojunction photocatalyst and a preparation method thereof. The photocatalyst is a heterojunction photocatalyst constructed by bismuth phosphate and graphite-phase carbon nitride. The preparation method comprises the following steps: preparing nanorod-like BiPO4 by a microwave method, preparing light and thin g-C3N4 by a calcining method grinding and compounding g-C3N4 and BiPO4 through a ball milling method to obtain a heterojunction photocatalytic material g-C3N4 / BiPO4; the prepared heterojunction photocatalyst is high in activity, high inlight utilization rate, good in stability and reusability, simple in preparation process, economical, efficient and good in application prospect.

Description

technical field [0001] The invention belongs to the technical field of photocatalysis, and in particular relates to a bismuth phosphate-based heterojunction photocatalyst and a preparation method thereof. Background technique [0002] As a green advanced oxidation technology with good application prospects, photocatalysis technology is widely used in the treatment of emerging pollutants. Traditional photocatalysts are constrained by the shortcomings of narrow spectral response range and high recombination rate of photogenerated electron-hole pairs. Bismuth-based semiconductor photocatalysts have attracted much attention as a photocatalyst with good application value in recent years. However, although a single bismuth-based photocatalyst has improved separation efficiency of photogenerated electron-hole pairs compared with traditional photocatalysts, it still It is difficult to meet the actual needs, and the single bismuth-based photocatalyst still needs to be improved throu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J35/10
CPCB01J27/24B01J35/61B01J35/39
Inventor 祝欣郭洋王鋙葶孙成周玉璇颜宇米娜王磊石佳奇陈樯杨璐万金忠盛峰黄剑波
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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