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A kind of bismuth-chromium composite oxide semiconductor photocatalyst and its preparation method and application

A technology of composite oxides and photocatalysts, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, chemical instruments and methods, etc., can solve the problem of low photocatalytic activity of bismuth chromate, To achieve the effect of mild conditions, simple operation and high light utilization efficiency

Active Publication Date: 2022-04-12
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, compared with the previous bismuth tungstate and bismuth molybdate, the photocatalytic activity of the bismuth chromate produced by the hydrothermal method in the report is still not high, and there is still a lot of room for improvement in the synthesis method and other aspects.

Method used

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  • A kind of bismuth-chromium composite oxide semiconductor photocatalyst and its preparation method and application
  • A kind of bismuth-chromium composite oxide semiconductor photocatalyst and its preparation method and application
  • A kind of bismuth-chromium composite oxide semiconductor photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Example 1: Cr 2 Bi 3 o 11 Preparation of semiconductor photocatalyst

[0038] (1) Disperse bismuth nitrate pentahydrate in deionized water at 60 degrees Celsius to obtain a white suspension, wherein the concentration of bismuth nitrate pentahydrate is 0.025 mol / L;

[0039](2) Dissolve sodium chromate tetrahydrate in deionized water at room temperature, so that the molar ratio of sodium chromate tetrahydrate in the aqueous solution and bismuth nitrate pentahydrate in the above step (1) is 1:2, and yellow-green clear solution;

[0040] (3) Add the solution in the above step (2) dropwise to the suspension in the above step (1), and stir continuously to obtain a yellow suspension;

[0041] (4) The suspension in the above step (3) was continuously stirred for 1 hour at 60 degrees Celsius, and a yellow precipitate was obtained after natural cooling;

[0042] (5) Filter the precipitate in the above step (4), collect the solid, fully wash with deionized water and ethanol...

Embodiment 2

[0046] Example 2: Cr 2 Bi 3 o 11 Semiconductor photocatalyst degrades wastewater containing colored pollutants

[0047] (1) Add 0.1g Cr to 100 mL of wastewater mixed with rhodamine B / methylene blue / methyl orange at a concentration of 5 mg / L 2 Bi 3 o 11 semiconductor photocatalyst;

[0048] (2) Fully stir, Cr 2 Bi 3 o 11 The catalyst is evenly dispersed in the wastewater;

[0049] (3) Use a light source with a wavelength of 300-800 nm to irradiate the wastewater in the above step (2), and the irradiation time is 1 hour.

[0050] Table 2 Cr 2 Bi 3 o 11 Degradation rate of semiconductor photocatalyst to colored pollutant wastewater within 1 hour

[0051] Pollutants Rhodamine B Methylene blue methyl orange Degradation rate / % 85.43 40.09 79.66

[0052] Visible, Cr 2 Bi 3 o 11 It has good degradation ability to organic dyes and other colored organic pollutants, and the degradation rate of rhodamine B reaches 85.43% within one hour.

Embodiment 3

[0053] Example 3: Cr 2 Bi 3 o 11 Semiconductor Photocatalyst Degradation of Phenol Wastewater

[0054] (1) Add 0.1g Cr to 100 mL of wastewater containing 10 mg / L phenol 2 Bi 3 o 11 semiconductor photocatalyst;

[0055] (2) Fully stir, Cr 2 Bi 3 o 11 The photocatalyst is evenly dispersed in the wastewater;

[0056] (3) Use a light source with a wavelength of 300-800 nm to irradiate the wastewater in the above step (2), and the irradiation time is 6 hours.

[0057] Table 3 Cr 2 Bi 3 o 11 Degradation rate of colorless phenol wastewater by semiconductor photocatalyst within 6 hours

[0058] Pollutants phenol Degradation rate / % 27.50 Total organic carbon removal rate / % 11.41

[0059] Visible, Cr 2 Bi 3 o 11 It also has the ability to degrade colorless phenol, and the degradation rates of phenol and total organic carbon reached 27.50 % and 11.41 % respectively within 6 hours. Compare the degradation ability of similar bismuth molybda...

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Abstract

The invention discloses a bismuth-chromium composite oxide semiconductor photocatalyst, a preparation method and application thereof. The molecular formula of the photocatalyst is Cr 2 Bi 3 o 11 , the maximum absorption wavelength is 560 nanometers, the band gap is about 2.15 eV, it is a rod-shaped structure, the length is between 1 and 1.5 microns, and the diameter is about 150 nanometers. Its preparation method: disperse bismuth nitrate pentahydrate in deionized water to obtain a white suspension; dissolve sodium chromate tetrahydrate in deionized water to obtain a yellow-green transparent solution; add sodium chromate solution dropwise to In the bismuth nitrate suspension, continuously stir to obtain a yellow suspension; continuously stir the obtained suspension for 0.5 to 24 hours, and obtain a yellow precipitate after natural cooling; filter, wash, vacuum dry, and grind to obtain a yellow powder Cr 2 Bi 3 o 11 Semiconductor photocatalysts. Cr prepared by the present invention 2 Bi 3 o 11 Semiconductor photocatalysts have a very wide range of light absorption wavelengths, so they have higher light utilization efficiency and can be used in environmental protection industries such as wastewater treatment.

Description

technical field [0001] The invention relates to a photocatalyst, in particular to a novel bismuth-chromium composite oxide semiconductor photocatalyst, a preparation method thereof and an application in the field of photocatalysis. Background technique [0002] Since Fujishima and Honda discovered that titanium dioxide has the ability to split water to produce hydrogen under ultraviolet light, photocatalytic technology has been widely studied as an advanced redox technology with promising prospects in the fields of splitting water to produce hydrogen and environmental protection. With its unique advantages, such as low cost and wide range of potential applications, titanium dioxide has gradually become one of the hotspots of frontier research, and photocatalytic technology based on photocatalytic materials has also been extensively developed. As a typical photocatalyst, the intrinsic electronic band structure of TiO is a well-known defect. Considering its excessive bandwidt...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31B01J35/00B01J35/02C02F1/30C02F101/30C02F101/34
CPCB01J23/002B01J23/31C02F1/30C02F2305/10C02F2101/308C02F2101/345B01J35/50B01J35/39
Inventor 孟祥超高新雨李子真任广敏韩鸿涛刘思彤王祎璇赵建勇高雨
Owner OCEAN UNIV OF CHINA
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