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Composite photocatalyst BiOBrxI1-x/BiOBr as well as preparation method and application thereof

A technology of catalyst and composite light, which is applied in the field of photocatalytic materials, can solve the problems of high photogenerated electron-hole recombination rate and low photocatalytic quantum efficiency, and achieve the effect of improving reaction efficiency, simple preparation process, and beneficial to industrial production

Pending Publication Date: 2021-02-26
QINGDAO UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, single BiOBr still faces problems such as high photogenerated electron-hole recombination rate and low photocatalytic quantum efficiency in practical applications.

Method used

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  • Composite photocatalyst BiOBrxI1-x/BiOBr as well as preparation method and application thereof
  • Composite photocatalyst BiOBrxI1-x/BiOBr as well as preparation method and application thereof
  • Composite photocatalyst BiOBrxI1-x/BiOBr as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Embodiment 1: A kind of composite photocatalyst BiOBr x I 1-x / BiOBr is prepared by the following method:

[0041] S1, 5mmol bismuth nitrate pentahydrate is placed in 20mL ethylene glycol, under the condition that ultrasonic frequency is 110kHz, ultrasonic power is 55W, ultrasonic dissolving 10min, obtain the alcoholic solution of bismuth nitrate; Get 0.4465g potassium bromide in 10mL ethyl alcohol Stir and dissolve in diol to obtain an alcoholic solution of potassium bromide; get 0.2075g of potassium iodide and dissolve it in 10mL of ethylene glycol solution to obtain an alcoholic solution of potassium iodide;

[0042] S2, adding the alcoholic solution of potassium bromide in the alcoholic solution of bismuth nitrate, stirred at a speed of 400r / min for 30min, then added dropwise the alcoholic solution of potassium iodide, after the dropwise addition, stirred at a speed of 400r / min for 30 minutes, and obtained mixture;

[0043] S3. Transfer the mixed solution to a 100...

Embodiment 2

[0045] Embodiment 2: A kind of composite photocatalyst BiOBr x I 1-x / BiOBr is prepared by the following method:

[0046] S1, 5mmol bismuth nitrate pentahydrate is placed in 20mL ethylene glycol, under the condition that ultrasonic frequency is 100kHz, ultrasonic power is 50W, ultrasonic dissolving 15min, obtain the alcoholic solution of bismuth nitrate; Get 0.2970g potassium bromide in 10mL ethyl alcohol Stir and dissolve in diol to obtain an alcoholic solution of potassium bromide; get 0.4150g of potassium iodide and dissolve it in 10mL of ethylene glycol solution to obtain an alcoholic solution of potassium iodide;

[0047] S2, adding the alcoholic solution of potassium bromide in the alcoholic solution of bismuth nitrate, stirred at a speed of 200r / min for 40min, then dripped the alcoholic solution of potassium iodide, after the dropwise addition, stirred for 40 minutes at a speed of 200r / min, to obtain a mixed solution;

[0048] S3. Transfer the mixed solution to a 100...

Embodiment 3

[0050] Embodiment 3: A kind of composite photocatalyst BiOBr x I 1-x / BiOBr is prepared by the following method:

[0051] S1, 5mmol bismuth nitrate pentahydrate is placed in 20mL ethylene glycol, under the condition that ultrasonic frequency is 120kHz, ultrasonic power is 60W, ultrasonic dissolving 5min, obtain the alcoholic solution of bismuth nitrate; Get 0.1488g potassium bromide in 10mL ethyl alcohol Stir and dissolve in diol to obtain an alcoholic solution of potassium bromide; get 0.6225g of potassium iodide and dissolve it in 10mL of ethylene glycol solution to obtain an alcoholic solution of potassium iodide;

[0052] S2, adding the alcoholic solution of potassium bromide in the alcoholic solution of bismuth nitrate, stirred at a speed of 800r / min for 20min, then added dropwise the alcoholic solution of potassium iodide, after the dropwise addition, stirred at a speed of 800r / min for 20 minutes, and obtained mixture;

[0053] S3. Transfer the mixed solution to a 100...

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Abstract

The invention discloses a composite photocatalyst BiOBrxI1-x / BiOBr as well as a preparation method and application of the composite photocatalyst BiOBrxI1-x / BiOBr. The preparation method of the composite photocatalyst BiOBrxI1-x / BiOBr comprises the following steps: respectively dissolving bismuth nitrate pentahydrate, a bromide and an iodide in an alcohol solvent to obtain an alcohol solution of bismuth nitrate, an alcohol solution of the bromide and an alcohol solution of the iodide; adding the alcoholic solution of the bromide into the alcoholic solution of bismuth nitrate, conducting uniform stirring, and dropwise adding the alcoholic solution of the iodide to obtain a mixed solution; and putting the mixed solution at the temperature of 95-105 DEG C for reaction for 7-9 hours, conducting cooling to room temperature to obtain a precipitate, and washing and drying the precipitate to obtain BiOBrxI1-x / BiOBr. The BiOBrxI1-x / BiOBr provided by the invention constructs a solid solution anda heterostructure through a simple solvothermal synthesis method to inhibit the recombination of photo-induced electrons and holes, so that the photocatalytic performance is improved.

Description

technical field [0001] This application relates to the field of photocatalytic materials, more specifically, it relates to a composite photocatalyst BiOBr x I 1-x / BiOBr preparation method and its application. Background technique [0002] In the 21st century, the energy crisis and environmental pollution have become two major problems that limit the sustainable development of human society. Therefore, the development of non-polluting, renewable, low-cost, and wide-source green new energy is a huge challenge facing the development of the world today. Based on the advantages of environmental friendliness, abundant resources, freedom from transportation, and inexhaustible supply, solar energy is the most ideal energy source in the future. Semiconductor photocatalysis has attracted great interest as an efficient and green method to degrade stubborn organic pollutants in aqueous environments. Among them, TiO 2 It is the earliest and most deeply studied semiconductor, which h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/06C02F1/30C02F101/34
CPCB01J27/06C02F1/30C02F2101/345C02F2305/10B01J35/39
Inventor 张妍成瑞杨晓龙聂兆广于建强彭彦华杨雪媛张正
Owner QINGDAO UNIV
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