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Preparation method of porous Bi2WO6 nanosheet photocatalytic material

A photocatalytic material, nanosheet technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve high photocatalytic performance, easy mass synthesis, large ratio The effect of surface area

Inactive Publication Date: 2015-05-06
WUHAN UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

To the best of our knowledge, no template-free method has been used to synthesize porous Bi 2 WO 6 Related reports on nanosheet photocatalytic materials to improve their photocatalytic performance

Method used

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  • Preparation method of porous Bi2WO6 nanosheet photocatalytic material
  • Preparation method of porous Bi2WO6 nanosheet photocatalytic material
  • Preparation method of porous Bi2WO6 nanosheet photocatalytic material

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Experimental program
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Effect test

Embodiment 1

[0027] Porous Bi 2 WO 6 The synthesis process of nanosheet photocatalytic material is as follows: 1) Na 2 WO 4 Dissolved in distilled water to form a homogeneous solution, where Na 2 WO 4 The solubility is 0.125mol / L; 2) Bi(NO 3 ) 3 The solid powder is evenly spread on the bottom of the beaker, and then the 50mL Na 2 WO 4 The solution was slowly added into the beaker along the wall of the beaker, in which the molar ratio of Bi to W was 1:3, and the reaction was allowed to stand at a constant temperature of 25°C for 48 hours, and the obtained precipitate was filtered, washed and dried to obtain a non-porous amorphous Bi 2 WO 6Nanosheet; 3) the non-porous amorphous Bi obtained in step 2) 2 WO 6 The nanosheets were heat-treated at 500 °C for 2 h to obtain porous Bi 2 WO 6 Nanosheet photocatalytic materials.

[0028] figure 1 is the porous Bi 2 WO 6 FESEM images of nanosheet photocatalytic materials. From figure 1 A and figure 1 B It can be seen that the prepare...

Embodiment 2

[0036] In order to test Na 2 WO 4 Concentration vs Porous Bi 2 WO 6 Influence of nanosheet photocatalytic material structure, except Na 2 WO 4 In addition to concentration, other reaction conditions are as follows: reaction temperature (25°C), reaction time (48h), molar ratio of Bi to W (1:3), high temperature heat treatment temperature (500°C), high temperature heat treatment time (2h), etc. Example 1 is the same. The results show that when Na 2 WO 4 When the concentration is 0.005mol / L, due to the WO in the system 4 2- The concentration is too low, Bi 2 WO 6 The self-assembly rate is small, resulting in an inconspicuous sheet structure. When Na 2 WO 4 When the concentration is between 0.03-0.30mol / L, Bi with thinner thickness and larger area can be obtained 2 WO 6 Precursor. When Na 2 WO 4 When the concentration is 0.50mol / L, due to WO 4 2- Concentration is too high, Bi 2 WO 6 The crystal growth rate is too fast, resulting in the stacking of each plate-...

Embodiment 3

[0038] In order to examine the effect of reaction temperature on porous Bi 2 WO 6 The impact of nanosheet photocatalytic materials, in addition to the reaction temperature, other reaction conditions are as follows: Na 2 WO 4 Concentration (0.125mol / L), reaction time (48h), molar ratio of Bi to W (1:3), high temperature heat treatment temperature (500°C), high temperature heat treatment time (2h), etc. are all the same as in Example 1. The results show that when the reaction temperature is 25-60 °C, the self-assembly rate is moderate, and Bi with high purity and good sheet structure can be obtained in a short time. 2 WO 6 Nanosheets. When the reaction temperature was 90 °C, the reaction rate was too fast, resulting in the stacking of each plate-shaped crystal, and the thickness of the plate increased accordingly. Therefore, in the porous Bi 2 WO 6 During the synthesis process of nanosheet photocatalytic materials, the optimum range of reaction temperature is 25-60°C.

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Abstract

The invention relates to a preparation method of a porous Bi2WO6 nanosheet photocatalytic material. The preparation method sequentially comprises the following steps: tiling Bi(NO3)3 solid powder evenly on the bottom of a flask; adding a Na2WO4 solution slowing into the flask slowly along the wall of the flask, carrying out constant-temperature standing reaction, filtering the obtained precipitate, washing and drying so as to obtain a pore-free amorphous Bi2WO6 nanosheet; and carrying out thermal treatment at high temperature of 200-800 DEG C for 0.5-5 hours, thereby obtaining the porous Bi2WO6 nanosheet photocatalytic material. The preparation method has the beneficial effects that the preparation is a rapid, economical and environment-friendly synthetic method of the porous Bi2WO6 nanosheet photocatalytic material; the porous Bi2WO6 nanosheet photocatalytic material synthesized by the method has relatively high specific surface area, so that Bi2WO6 shows high photocatalytic performance.

Description

technical field [0001] The present invention relates to the technical field of porous material and sheet structure material, specifically relate to porous Bi 2 WO 6 Preparation method of nanosheet photocatalytic material. technical background [0002] Due to the increasingly serious global environmental pollution problem, the use of photocatalytic materials has broad development prospects in the degradation of organic pollutants. It is well known that bismuth tungstate has a forbidden band width of about 2.7eV, has strong absorption in the visible light region of sunlight with a wavelength greater than 420nm, and can undergo photocatalytic reactions. After being irradiated by visible light, bismuth tungstate absorbs photon energy and excites photogenerated electrons and holes, and then generates active oxygen and hydroxyl radicals. It has strong oxidizing ability, and they can oxidize most organic pollutants. And break down. Therefore, it can play a good role in solving ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/31B01J35/10
Inventor 余火根孙祺贾相锐王苹余家国
Owner WUHAN UNIV OF TECH
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