Niobium-doped bismuth oxybromide catalyst and preparation method and use method thereof

A technology of bismuth oxybromide and a catalyst is applied in the field of photocatalytic materials, which can solve the problems of easy recombination of photogenerated electron holes, low degradation ability of organic matter, low photon quantum efficiency, etc., and achieves the effects of controllable method, low price and good light absorption.

Pending Publication Date: 2020-10-09
DALIAN POLYTECHNIC UNIVERSITY
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Problems solved by technology

[0005] The present invention provides a niobium-doped bismuth oxybromide catalyst and its preparation and use methods to solve the problems of easy recombination of photogenerated electrons and holes, low photon quantum efficiency, weak surface reaction, and low degradation ability of organic matter in current semiconductor catalysts. question

Method used

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  • Niobium-doped bismuth oxybromide catalyst and preparation method and use method thereof
  • Niobium-doped bismuth oxybromide catalyst and preparation method and use method thereof
  • Niobium-doped bismuth oxybromide catalyst and preparation method and use method thereof

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preparation example Construction

[0032] The present invention relates to a method for preparing a curd-shaped Nb-BiOBr photocatalyst. The method comprises the following steps: 1. Take an alcohol solvent and heat it to boiling and cool naturally; 2. Add a bismuth salt compound, a niobium compound and a bromine compound in sequence, mix and fully stir ; 3. Add neutral solution; 4. High-pressure constant temperature reaction; 5. Cool to room temperature, perform centrifugation, wash with water and ethanol solution respectively, collect powder after drying, and obtain flower spherical niobium-doped bismuth oxybromide.

[0033] Specifically: S1. Heat 5-90 mL of diethylene glycol, triethylene glycol, isopropanol, ethylene glycol or glycerol as an alcohol solvent to boiling, and then cool to 40-80°C; the alcohol solvent Including diethylene glycol, triethylene glycol, isopropanol, ethylene glycol or glycerol, etc.

[0034] S2. Add 0.1 to 1.5g of bismuth salt compound, 0.001 to 0.05g of niobium compound and 0.02 to 0...

Embodiment 1

[0040] Heat 20mL of ethylene glycol to boiling, then stop heating and allow the solution to cool naturally to 60°C, add 0.485g of bismuth nitrate pentahydrate, 0.0068g of niobium oxalate hydrate and 0.1024g of 2-ethylamine hydrobromide to the ethylene glycol solution , mixed and fully stirred for 30 minutes, then 60 mL of isopropanol was added, and then continued to be fully stirred for 30 minutes, and the resulting mixed solution was put into a high-pressure reactor with a pressure of 1-2 MPa, and reacted at a constant temperature of 120 ° C for 12 hours. After the reaction solution was cooled to room temperature, the solution was separated, washed three times with water and ethanol solution respectively, dried at 60°C for 12 hours, and the resulting powder was collected to obtain the final product niobium-doped bismuth oxybromide (Nb-BiOBr) .

[0041] figure 1 It is the XRD diffraction pattern of the Nb-BiOBr photocatalyst obtained in this example, and compared with the PDF...

Embodiment 2

[0048] Heat 20mL of ethylene glycol to boiling, then stop heating and allow the solution to cool naturally to 60°C, add 0.485g of bismuth nitrate pentahydrate, 0.0027g of niobium oxalate hydrate and 0.1024g of 2-ethylamine hydrobromide to the ethylene glycol solution , mixed and fully stirred for 30 minutes, then 60 mL of isopropanol was added, and then continued to be fully stirred for 30 minutes, and the resulting mixed solution was put into a high-pressure reactor with a pressure of 1-2 MPa, and reacted at a constant temperature of 120 ° C for 12 hours. After the reaction solution was cooled to room temperature, the solution was separated, washed three times with water and ethanol solution respectively, dried at 60°C for 12 hours, and the resulting powder was collected to obtain the final product niobium-doped bismuth oxybromide (Nb-BiOBr) .

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Abstract

The invention provides a niobium-doped bismuth oxybromide catalyst and a preparation method and a use method thereof. The preparation method comprises the following steps: 1, heating an alcohol solvent until the alcohol solvent is boiled, and naturally cooling, 2, sequentially adding a bismuth salt compound, a niobium compound and a bromine compound, mixing and fully stirring, 3, adding a neutralsolution, 4, carrying out high-pressure constant-temperature reaction, and 5, cooling to room temperature, carrying out centrifugal separation, respectively washing with water and an ethanol solution,drying, and collecting the powder to obtain the flower-ball-shaped niobium-doped bismuth oxybromide. The photocatalyst prepared by the preparation method disclosed by the invention is Nb-BiOBr, the photocatalyst has good visible light photocatalytic degradation organic matter performance, higher photocatalytic activity and photo-induced electron hole separation efficiency, the degradation efficiency of the photocatalyst is 6.4 times that of BiOBr in the prior art, and the photocatalyst is environmentally friendly, harmless, low in price, controllable in method and easy to operate and has wideapplication prospects in the field of environmental pollution and governance.

Description

technical field [0001] The invention relates to the technical field of photocatalytic materials, in particular to a niobium-doped bismuth oxybromide (Nb-BiOBr) photocatalyst and a preparation method and application method thereof. Background technique [0002] With the rapid development of modern industry and the growth of population, the discharge of waste water has surged, and the situation of water pollution has become more and more serious, hindering sustainable development. Among various water pollution control technologies, photocatalytic technology has become one of the most promising technologies due to its low cost, environmental protection and high efficiency. [0003] The high content of organic matter in wastewater seriously pollutes the environment, endangers people's health, and seriously damages water bodies, soils and their ecosystems. Traditional wastewater treatment methods are expensive, high energy consumption, low COD removal efficiency and long reactio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06B01J35/00B01J35/08C02F1/30C02F101/30
CPCB01J27/06B01J35/004B01J35/08C02F1/30C02F2305/10C02F2101/30
Inventor 董晓丽尉志苹王宇郑楠
Owner DALIAN POLYTECHNIC UNIVERSITY
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