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Bismuth-bismuthyl carbonate composite photocatalyst as well as preparation method and application thereof

A technology of bismuth oxycarbonate and composite light, which is applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problems of high cost of precious metals and complicated processes, and achieve Short reaction time, cheap and easy-to-obtain raw materials, and high-efficiency degradation effects

Pending Publication Date: 2021-11-05
SHAANXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, at present, the cost of depositing noble metals on the surface of semiconductor catalysts is high and the process is complicated

Method used

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  • Bismuth-bismuthyl carbonate composite photocatalyst as well as preparation method and application thereof
  • Bismuth-bismuthyl carbonate composite photocatalyst as well as preparation method and application thereof
  • Bismuth-bismuthyl carbonate composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0038] A kind of nano flower spherical Bi-Bi of the present invention 2 o 2 CO 3 The preparation method of composite photocatalyst specifically comprises the following steps:

[0039] Step 1: by the mol ratio of 1:2, sodium citrate (Na 3 C 6 h 5 o 7 2H 2 O) and Bi(NO 3 ) 3 ·5H 2 O dissolved in HNO3 solution, after stirring for 30-90min, use NaOH solution to adjust its pH to 5-5.5, then stir for 30-90min to obtain precursor solution A, and Bi in precursor solution A 3+ The concentration is 0.05-0.2mol / L;

[0040] Step 2: Put the precursor solution A in a hydrothermal reaction kettle, the reaction filling ratio is 65-85%, and the temperature is raised from room temperature to 180-200°C in 45-60 minutes, and the reaction is completed after 18-24 hours of heat preservation, and naturally cooled to room temperature, the obtained The precipitate was washed three times with deionized water and absolute ethanol, then dried at a constant temperature of 65-80°C for 10-16 hour...

Embodiment 1

[0053] Step 1: Add 1.2g Na 3 C 6 h 5 o 7 2H 2 O and 3.88g Bi(NO 3 ) 3 ·5H 2 O dissolved in HNO 3 solution, after stirring for 60 minutes, adjust its pH to 5.4 with NaOH solution, and then stir for 60 minutes to obtain precursor solution A;

[0054] Step 2: Put the precursor solution A in a hydrothermal reaction kettle with a reaction filling ratio of 80%, raise the temperature from room temperature to 180°C for 60 minutes, finish the reaction after 18 hours of heat preservation, and naturally cool to room temperature. The obtained precipitate is washed with deionized water and After washing with absolute ethanol three times, dry at a constant temperature of 70 °C for 12 h, and grind to obtain Bi 2 o 2 CO 3 Powder;

[0055] Step 3: Take 0.00025mol NaBH 4 Add it into 20mL deionized water, stir for 30min to get Precursor B;

[0056] Step 4: Take 0.001mol Bi 2 o 2 CO 3 Add the powder into 20mL deionized water, stir for 30min to obtain the precursor solution C;

[...

Embodiment 2

[0059] Step 1: Add 1.2g Na 3 C 6 h 5 o 7 2H 2 O and 3.88g Bi(NO 3 ) 3 ·5H 2 O dissolved in HNO 3 solution, after stirring for 60 minutes, adjust its pH to 5.4 with NaOH solution, and then stir for 60 minutes to obtain precursor solution A;

[0060] Step 2: Put the precursor liquid A in a hydrothermal reaction kettle with a reaction filling ratio of 80%, raise the temperature from room temperature to a reaction temperature of 180°C in 60 minutes, finish the reaction after 18 hours of heat preservation, and naturally cool to room temperature, and the obtained precipitate is washed with deionized water After washing with absolute ethanol for 3 times, dry at 70°C for 12 hours, and grind to obtain Bi 2 o 2 CO 3 Powder;

[0061] Step 3: Take 0.0005mol NaBH 4 Add it into 20mL deionized water, stir for 30min to get Precursor B;

[0062] Step 4: Take 0.001mol Bi 2 o 2 CO 3 Add the powder into 20mL deionized water, stir for 30min to obtain the precursor solution C;

[0...

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Abstract

The invention provides a bismuth-bismuthyl carbonate composite photocatalyst and a preparation method and application thereof, the preparation method comprises the following steps: step 1, dispersing nano flower-ball-shaped Bi2O2CO3 powder and NaBH4 in deionized water according to a molar ratio of (0.25-7.5): (1-3) to obtain a precursor solution A, and dispersing flaky Bi2O2CO3 powder and NaBH4 in deionized water according to a molar ratio of (0.5-7.5): (1-3), so as to obtain a precursor solution B; and step 2, uniformly mixing the precursor solution A or the precursor solution B, then filtering to obtain a mixed solution, and sequentially washing and drying the obtained filter cake to obtain the nano flower-ball-shaped or sheet-shaped bismuth-bismuthyl carbonate composite photocatalyst, which can realize efficient degradation of tetracycline under visible light and near-infrared light, and has a good application prospect in antibiotic degradation.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic material preparation, in particular to a bismuth-bismuth bismuth oxycarbonate composite photocatalyst and its preparation method and application. Background technique [0002] The rapid development of industry has led to increasingly serious air pollution, seriously affecting the sustainable development of human society and people's health. Photocatalytic technology can be used to control air pollution with good results, and the cost of using sunlight as the driving force is low, which has obvious advantages. [0003] Bi 2 o 2 CO 3 As a semiconductor photocatalyst with unique crystal and electronic structure and excellent activity, it has received extensive attention and research. However a single Bi 2 o 2 CO 3 Due to the disadvantages of large band gap (~3.2eV) and narrow photoresponse range, its photocatalytic activity is reduced, which limits its practical application. A large nu...

Claims

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Application Information

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IPC IPC(8): B01J23/18B01J27/232B01J35/00B01J35/08C02F1/30C02F101/34C02F101/38
CPCB01J27/232B01J23/18C02F1/30C02F2101/34C02F2101/38C02F2305/10B01J35/51B01J35/39Y02W10/37
Inventor 谈国强毕钰杨迁张碧鑫王勇王敏冯帅军刘宸君任慧君夏傲
Owner SHAANXI UNIV OF SCI & TECH
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