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Rare earth element Nd-doped Bi2WO6 composite photocatalyst, preparation method therefor and applications thereof

A technology of rare earth elements and complex light, which is applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problems affecting the properties of synthetic powders, particle size, and heat distribution. Inhomogeneity, slow heating rate and other problems, to achieve the effect of short preparation cycle, short synthesis time and fast reaction speed

Active Publication Date: 2014-03-19
盐城市鹤业实业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Rare earth element Nd-doped Bi2WO6 composite photocatalyst, preparation method therefor and applications thereof
  • Rare earth element Nd-doped Bi2WO6 composite photocatalyst, preparation method therefor and applications thereof
  • Rare earth element Nd-doped Bi2WO6 composite photocatalyst, preparation method therefor and applications thereof

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Experimental program
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Effect test

Embodiment 1

[0030] Rare earth element Nd doped Bi 2 WO 6 The preparation method of composite photocatalyst 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 for 40 minutes to mix the raw materials therein evenly;

[0032] Step 2: Weigh a certain amount of Nd(NO 3 ) 3 ·6H 2 O is added to the mixed solution to obtain a reaction solution, wherein the amount of Nd added is R Nd =6% (R Nd =n Nd / (n Bi +n Nd )×100%, n Bi and n Nd are the molar amounts of Bi and Nd respectively), the reaction solution was magnetically stirred at room temperature for 40min to obtain the precursor solution;

[0033] Step 3: Move the precursor liquid into the microwave hydrothermal reactor lined...

Embodiment 2

[0037] Rare earth element Nd doped Bi 2 WO 6 The preparation method of composite photocatalyst comprises the following steps:

[0038] Step 1: Weigh Bi(NO 3 ) 3 ·5H 2 O and Na 2 WO 4 2H 2 O is put into a beaker, and then 60ml of deionized water is added to the beaker to prepare a mixed solution, wherein 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 for 40 minutes to mix the raw materials therein evenly;

[0039] Step 2: Weigh a certain amount of Nd(NO 3 ) 3 ·6H 2 O is added to the mixed solution to obtain a reaction solution, wherein the amount of Nd added is R Nd =10% (R Nd =n Nd / (n Bi +n Nd )×100%, n Bi and n Nd are the molar amounts of Bi and Nd respectively), the reaction solution was magnetically stirred at room temperature for 40min to obtain the precursor solution;

[0040] Step 3: Move the precursor liquid into the microwave hydrothermal re...

Embodiment 3

[0047] Rare earth element Nd doped Bi 2 WO 6 The preparation method of composite photocatalyst 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 mixed solution is magnetically stirred for 40 minutes to mix the raw materials therein evenly;

[0049] Step 2: Weigh a certain amount of Nd(NO 3 ) 3 ·6H 2 O is added to the mixed solution to obtain a reaction solution, wherein the amount of Nd added is R Nd =15% (R Nd =n Nd / (n Bi +n Nd )×100%, n Bi and n Nd are the molar amounts of Bi and Nd respectively), the reaction solution was magnetically stirred at room temperature for 20min to obtain the precursor solution;

[0050] Step 3: Move the precursor liquid into the microwave hydrothermal reactor line...

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Abstract

Provided is a rare earth element Nd-doped Bi2WO6 composite photocatalyst, a preparation method therefor and applications thereof. Bismuth nitrate pentahydrate and sodium tungstate dihydrate are dissolved in water respectively and the molar ratio of Bi to W is 2:1. After the mixture is stirred uniformly, neodymium nitrate hexahydrate is added, and the content of Nd is as follows: RNd is equal to 2%-20%, and RNd is equal to nNd / (nBi+nNd)*100%. The mixture is stirred unceasingly and a precursor solution is obtained; a Nd-doped Bi2WO6 composite photocatalyst is prepared through a microwave hydrothermal method with a power of 300W at the temperature of 160-220 DEG C after thermal insulation for 30-120min. The main component is orthorhombic Bi2WO6, and the Bi2WO6 contains Nd<+3>. The method combines advantages of microwave and hydrothermal methods, the technology is simple and easy to control, the preparation cycle is short, energy is saved, the composite photocatalyst obtained from one step synthesis has excellent photocatalytic activity and can be used for degrading organics.

Description

technical field [0001] The invention belongs to the field of functional materials and relates to a rare earth element Nd doped Bi 2 WO 6 Composite photocatalyst and its preparation method and application. Background technique [0002] With the rapid development of modern civilization and science and technology, environmental pollution is becoming more and more serious. Environmental pollution and prevention have become an important topic of global concern. In the past 20 to 30 years, the development of photocatalytic degradation technology has provided human beings with the problem of environmental pollution control. an effective way. At present, the search for new visible light-responsive photocatalysts shows the need and urgency. [0003] 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 ...

Claims

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Application Information

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IPC IPC(8): B01J23/31B01J35/02C02F1/30
Inventor 谈国强黄靖
Owner 盐城市鹤业实业投资有限公司
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