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A kind of visible light responsive CE doped bi2wo6 microcrystal and its preparation method and application

A visible light and microcrystalline technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. Uniformity, slow heating rate and other issues, to achieve the effect of short preparation cycle, short synthesis time and fast reaction speed

Active Publication Date: 2015-10-28
盐城亿通针织有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the traditional hydrothermal synthesis method, the common conduction heating method is often used. This heating method has the disadvantages of slow heating rate, long reaction time, uneven heat distribution, and large temperature gradient, which seriously affects the synthetic powder. The nature of the body, particle size, etc.

Method used

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  • A kind of visible light responsive CE doped bi2wo6 microcrystal and its preparation method and application
  • A kind of visible light responsive CE doped bi2wo6 microcrystal and its preparation method and application
  • A kind of visible light responsive CE doped bi2wo6 microcrystal and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Visible light responsive Ce-doped Bi 2 WO 6 The preparation method of microcrystal, comprises the following steps:

[0031] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was placed in a beaker, and deionized water was added to the beaker to prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.2mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.1mol / L, and the mixed solution is magnetically stirred to make the raw materials therein uniformly mixed;

[0032] Step 2: Take a certain amount of Ce(NO 3 ) 3 ·6H 2 O is added to the mixed solution to obtain a reaction solution, wherein the amount of Ce added is R Ce =4% (R Ce =n Ce / (n Bi +n Ce )×100%, n Bi and n Ce are the molar amounts of Bi and Ce, respectively), the reaction solution was magnetically stirred at room temperature for 20 minutes, then placed in an ultrasonic instrument, and ultrasonically oscillated for 60 minutes to obtain a precursor solution, and the ...

Embodiment 2

[0037] Visible light responsive Ce-doped Bi 2 WO 6 The preparation method of microcrystal, comprises the following steps:

[0038] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was placed in a beaker, and deionized water was added to the beaker to prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.1mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.05mol / L, and the mixed solution is magnetically stirred to make the raw materials therein uniformly mixed;

[0039] Step 2: Take a certain amount of Ce(NO 3 ) 3 ·6H 2 O is added to the mixed solution to obtain a reaction solution, wherein the amount of Ce added is R Ce =10% (R Ce =n Ce / (n Bi +n Ce )×100%, n Bi and n Ce are the molar amounts of Bi and Ce, respectively), the reaction solution was magnetically stirred at room temperature for 30 minutes, then placed in an ultrasonic instrument, and ultrasonically oscillated for 30 minutes to obtain a precursor solution, and th...

Embodiment 3

[0047] Visible light responsive Ce-doped Bi 2 WO 6 The preparation method of microcrystal, comprises the following steps:

[0048] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O was placed in a beaker, and deionized water was added to the beaker to prepare a mixed solution, in which Bi(NO 3 ) 3 ·5H 2 The concentration of O is 0.6mol / L, Na 2 WO 4 2H 2 The concentration of O is 0.3mol / L, and the magnetic stirring and mixing solution makes the raw materials therein evenly mixed;

[0049] Step 2: Take a certain amount of Ce(NO 3 ) 3 ·6H 2 O is added to the mixed solution to obtain a reaction solution, wherein the amount of Ce added is R Ce =12% ​​(R Ce =n Ce / (n Bi +n Ce )×100%, n Bi and n Ceare the molar amounts of Bi and Ce, respectively), the reaction solution was magnetically stirred at room temperature for 40 minutes, then placed in an ultrasonic instrument, and ultrasonically oscillated for 30 minutes to obtain a precursor solution, and the pH v...

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Abstract

The invention relates to a visible-light response Ce doped Bi2WO6 microcrystal, a preparation method and an application thereof. The preparation method comprises: respectively dissolving bismuth nitrate pentahydrate and sodium tungstate dehydrate in water according to a molar ratio of Bi to W of 2:1, uniformly stirring, and adding cerium nitrate hexahydrate, wherein the Ce content RCe is 2-20%, and RCe meets the following formula that: RCe=nCe / (nBi+nCe)*100%; and continuously stirring, carrying out ultrasonic oscillation to obtain a precursor solution, and carrying out thermal insulation for 60-120 min at a temperature of 160-220 DEG C by using a microwave hydrothermal method at a power of 300 W to obtain the visible-light response Ce doped Bi2WO6 microcrystal, wherein the main component is the orthorhombic phase Bi2WO6, and the Bi2WO6 contains Ce<3+>. According to the present invention, advantages of the microwave method and the hydrothermal method are combined, the process is simple and easy to control, the preparation period is short, the energy sources are saved, and the Ce doped Bi2WO6 microcrystal synthesized through one-step synthesis has characteristics of uniform particle size distribution and good photocatalysis activity, and can be used for degrading organic matters.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a visible light responsive Ce-doped Bi 2 WO 6 Microcrystals and their preparation and applications. Background technique [0002] As a new type of photocatalyst, bismuth tungstate has the following characteristics: (1) good response to ultraviolet and visible light; (2) thermal stability; (3) photocatalytic stability; (4) relatively low cost; (5) environmentally friendly. Therefore, Bi 2 WO 6 The research and development of photocatalytic materials will improve the utilization rate of solar energy and have potential practical value in environmental purification and new energy development. But at the same time, because of its relatively narrow band gap, the recombination probability of photogenerated electrons and holes increases, which reduces the efficiency of photons, thus affecting Bi 2 WO 6 photocatalytic performance. [0003] Most of the photodegradation reactions of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/31B01J35/08A62D3/17
Inventor 谈国强黄靖
Owner 盐城亿通针织有限公司
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