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Bi2WO6 modified TiO2 nanobelt photocatalyst, preparation method and application thereof

A photocatalyst and nanobelt technology, applied in the field of nanophotocatalysis, can solve the problems of difficult recycling and reuse, secondary pollution, easy agglomeration, etc., and achieve the effects of easy recycling and reuse, low band gap width and high specific surface area

Inactive Publication Date: 2013-10-16
ANHUI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to TiO 2 In the process of powder application, there are problems such as easy agglomeration, difficult recycling and reuse, and easy to cause secondary pollution.

Method used

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  • Bi2WO6 modified TiO2 nanobelt photocatalyst, preparation method and application thereof
  • Bi2WO6 modified TiO2 nanobelt photocatalyst, preparation method and application thereof
  • Bi2WO6 modified TiO2 nanobelt photocatalyst, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Pretreatment of titanium sheets: The titanium sheets with a size of 25mm×50mm×0.25mm were ultrasonically washed with detergent powder, deionized water, acetone, alcohol, and deionized water for 5 minutes to remove surface pollutants, and then the titanium sheets Put it into a mixed acid solution of hydrofluoric acid, nitric acid and deionized water with a volume ratio of 1:1:4 for chemical polishing to remove surface impurities, and then dry it at room temperature under nitrogen protection.

[0036] Titanium dioxide nanoarrays (TiO 2 nanobelt): Put the pretreated titanium sheet into a 50mL hydrothermal reactor lined with polytetrafluoroethylene, add 35mL of sodium hydroxide solution with a concentration of 3mol / L, and place it at 200°C Under the hydrothermal reaction for 48h, naturally cooled to room temperature after the reaction, took out and rinsed with deionized water.

[0037] TiO 2 Preparation of nanobelt photocatalyst: Put the titanium dioxide nanoarray with ti...

Embodiment 2

[0040] Pretreatment of titanium sheet and TiO 2 The preparation of the nanobelt is the same as in Example 1.

[0041] 0.01mol of analytically pure Bi(NO 3 ) 3 Dissolved in 5mL of glacial acetic acid, additionally 0.005mol of analytically pure Na 2 WO 4 Dissolve in 90mL deionized water, then mix the two solutions together, stir for 2h to form a white suspension (and adjust the pH of the suspension to 3 with glacial acetic acid).

[0042] TiO 2 The nanobelts and 35mL white suspension were placed in a 50mL hydrothermal reaction kettle lined with polytetrafluoroethylene, and hydrothermally reacted at 140°C for 20h. After cooling to room temperature naturally, they were taken out and rinsed with deionized water. Dry at room temperature under nitrogen protection. And calcined at 400°C for 3h, you can get Bi 2 WO 6 Modified TiO 2 nanobelt. For its XRD diagram and SEM diagram, please refer to figure 1 and 2 .

[0043] like image 3 As shown, under the irradiation of 350W...

Embodiment 3

[0045] Pretreatment of titanium sheet and TiO 2 The preparation of the nanobelt is the same as in Example 1.

[0046] 0.02mol of analytically pure Bi(NO 3 ) 3 Dissolved in 5mL of glacial acetic acid, additionally 0.01mol of analytically pure Na 2 WO 4 Dissolve in 90mL deionized water, then mix the two solutions together, stir for 2h to form a white suspension (and adjust the pH of the suspension to 3 with glacial acetic acid).

[0047] TiO 2 The nanobelts and 35mL white suspension were placed in a 50mL hydrothermal reaction kettle lined with polytetrafluoroethylene, and hydrothermally reacted at 140°C for 20h. After cooling to room temperature naturally, they were taken out and rinsed with deionized water. Dry at room temperature under nitrogen protection. And calcined at 400°C for 3h, you can get Bi 2 WO 6 Modified TiO 2 nanobelt. For its XRD diagram and SEM diagram, please refer to figure 1 and 2 , photocatalytic cycle degradation diagram please refer to Figure...

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Abstract

The invention relates to the technical field of nano photocatalysis, particularly to Bi2WO6 modified TiO2 nanobelt photocatalyst, a preparation method and application thereof. The Bi2WO6 modified TiO2 nanobelt photocatalyst takes the shape of an anatase type nanobelt and is 4.8-5.2 mum in length and 380-420 nm in width. The preparation method of the photocatalyst mainly includes the steps of titanium sheet pretreatment, TiO2 nanobelt forming through the sodium hydroxide solution corrosion method, preparation of Bi2WO6 modified TiO2 nanobelt through the hydrothermal synthesis method and forming of Bi2WO6 modified TiO2 nanobelt photocatalyst through calcination. The prepared Bi2WO6 modified TiO2 nanobelt photocatalyst provided by the invention takes the shape of the anatase type nanobelt, has smaller forbidden bandwidth and larger specific surface area, thereby having the photocatalytic activity for organic substance degradation 25% above higher than that of a pure TiO2 nanobelt, and has excellent cycling stability, can be repeatedly used, and avoids secondary pollution during the photocatalytic degradation.

Description

technical field [0001] The invention relates to the technical field of nanometer photocatalysis, in particular to a Bi 2 WO 6 Modified TiO 2 Nanobelt photocatalyst, preparation method and use thereof. Background technique [0002] Nano-TiO 2 It is an N-type semiconductor material. Due to its non-toxicity, strong stability, high chemical inertness in aqueous solution, and high catalytic activity under light, it has great application prospects in photocatalytic degradation of organic matter in aqueous solution. Due to TiO 2 In the process of powder application, there are problems such as easy agglomeration, difficulty in recycling and reuse, and easy to cause secondary pollution. Recently, the preparation of easily recycled, reusable, high-quality TiO 2 Photocatalysts have become the research target of people. [0003] TiO 2 The band gap of nanomaterials is about 3.2eV, and its inherent wide band gap and high recombination rate are the two main factors restricting the ...

Claims

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Application Information

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IPC IPC(8): B01J23/31C02F1/30C02F1/58C02F101/38
Inventor 吴明在李洋吴文鉴李广孙兆奇
Owner ANHUI UNIVERSITY
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