Method for preparing BiVO4 film with photocatalysis performance by using sol-gel method

A technology of photocatalysis and gel method, which is applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., to achieve environmental friendliness, uniform components, and high purity of products Effect

Active Publication Date: 2013-03-06
盐城市鹤业实业投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the present invention, a monoclinic BiVO with certain photocatalytic activity under visible light and easy to recycle can be prepared 4 Thin film, resolved BiVO 4 Immobilization and secondary utilization of photocatalysts

Method used

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  • Method for preparing BiVO4 film with photocatalysis performance by using sol-gel method
  • Method for preparing BiVO4 film with photocatalysis performance by using sol-gel method

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step (1): According to the molar ratio of Bi:CA=1:1, 0.012mol Bi(NO 3 ) 3 ·5H 2 O and 0.012mol of citric acid were dissolved in 10ml of deionized water, stirred evenly, and the pH was adjusted with ethanolamine until the solution was clear to obtain precursor solution A; wherein CA was the abbreviation of citric acid;

[0018] Step (2) according to the molar proportion of V:CA=1:1.8 will 0.012mol NH 4 VO 3 and 0.0216mol citric acid were dissolved in 10ml boiling water to prepare precursor solution B;

[0019] Step (3) According to the ratio of Bi:V=1:1, slowly add the precursor solution A to the precursor solution B and mix, stir at constant temperature for 5 hours to obtain dark blue BiVO 4 Sol C;

[0020] Step (4): Spin-coat dark blue BiVO on the surface of the pre-treated FTO substrate at a speed of 4000 rpm with a spin coating method 4 Sol C, pre-annealed the film on the surface of the spin-coated FTO substrate at 200 ° C for 6 min, and the pre-treatment proce...

Embodiment 2

[0024] Step (1): According to the molar ratio of Bi:CA=1:1.5, 0.01mol Bi(NO 3 ) 3 ·5H 2 O and 0.015mol citric acid were dissolved in 10ml of deionized water, stirred evenly, and the pH was adjusted with ethanolamine until the solution was clear to obtain the precursor solution A;

[0025] Step (2) according to the molar proportion of V:CA=1:1.5 will 0.012mol NH 4 VO 3 and 0.018mol citric acid were dissolved in 10ml boiling water to prepare precursor solution B;

[0026] Step (3) According to the ratio of Bi:V=1:1.2, the precursor solution A was slowly added dropwise to the precursor solution B for mixing, and stirred at constant temperature for 5 hours to obtain dark blue BiVO 4 Sol C;

[0027] Step (4): Spin-coat dark blue BiVO on the surface of the pre-treated FTO substrate at a speed of 4500 rpm with a spin coating method 4 Sol C, pre-annealed the film on the surface of the spin-coated FTO substrate at 200 ° C for 3 min, and the pre-treatment process of the FTO glass ...

Embodiment 3

[0033] Step (1): According to the molar ratio of Bi:CA=1:0.8, 0.008mol Bi(NO 3 ) 3 ·5H 2 O and 0.0064mol citric acid were dissolved in 10ml deionized water, stirred evenly, and the pH was adjusted with ethanolamine until the solution was clear to obtain the precursor solution A;

[0034] Step (2) according to the molar proportion of V:CA=1:0.8 will 0.008mol NH 4 VO 3 and 0.0064mol citric acid were dissolved in 10ml boiling water to prepare precursor B;

[0035] Step (3) According to the ratio of Bi:V=1:1, slowly add the precursor solution A to the precursor solution B and mix, stir at constant temperature for 5 hours to obtain dark blue BiVO 4 Sol C;

[0036] Step (4): Spin-coat dark blue BiVO on the surface of the pre-treated FTO substrate at a speed of 3500rpm with a spin coater 4 Sol C, pre-annealed the film on the surface of the spin-coated FTO substrate at 250 ° C for 4 min, and the pre-treatment process of the FTO glass substrate was ultrasonic cleaning with aceton...

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Abstract

The invention discloses a method for preparing a BiVO4 film with photocatalysis performance by using a sol-gel method. The method comprises the following steps of: respectively preparing a precursor solution A and a precursor solution B by taking bismuth nitrate pentahydrate (Bi(NO3)3.5H2O) and ammonium metavanadate (NH4VO3) as raw materials and taking citric acid as a solvent, preparing BiVO4 sol by mixing the precursor solution A with the precursor solution B; and coating the BiVO4 sol to a treated FTO (Fluorine-doped Tin Oxide) glass substrate surface in a spinning manner by adopting a spin coating method so as to form a film, and carrying out pre-annealing and annealing treatment on the film formed after spin coating, thereby obtaining the BiVO4 film fixed on the FTO glass substrate surface. According to the method for preparing the BiVO4 film with the photocatalysis performance by using the sol-gel method, the pure-monoclinic-phase BiVO4 film is prepared by combing the sol-gel method with the spin coating method, the prepared BiVO4 film has certain photocatalysis activity under visible light irradiation, meanwhile, the problem of immobilization of a BiVO4 photocatalyst is solved, and then, the separation, recovery and reuse of the BiVO4 photocatalyst are realized.

Description

technical field [0001] The invention belongs to the field of functional materials, and relates to a sol-gel method combined with a spin coating method to prepare BiVO with photocatalytic properties 4 thin film method. Background technique [0002] Since 1972 FjishimaA and Honda K proposed in TiO 2 Photodecomposition of H on the electrode 2 Since O, research on semiconductor heterogeneous photocatalytic reactions has continued to deepen. In terms of degrading sewage and purifying air, semiconductor photocatalysts have shown the advantages of strong oxidation, complete mineralization of pollutants, and direct use of sunlight. Related research has made great progress in recent years. Among many photocatalytic materials, BiVO 4 It is widely used due to its relatively narrow band gap, high visible light photocatalytic activity, non-toxicity, and good stability, and is recognized as one of the most promising photocatalytic materials at present. [0003] BiVO 4 There are thre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/22B01J35/06C02F1/30
Inventor 谈国强张丽丽魏莎莎
Owner 盐城市鹤业实业投资有限公司
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