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Synthesis method of phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst

A nano-photocatalyst, tio2-bivo4 technology, applied in chemical instruments and methods, physical/chemical process catalysts, hydrogen production, etc., can solve the problems of poor hydrogen production activity, improve separation efficiency, avoid rapid recombination, load The effect of prolonging the carrier life

Inactive Publication Date: 2015-04-08
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to solve the technical problem of poor activity of decomposing water to produce hydrogen under the irradiation of bismuth vanadate with visible light, and to provide a phosphate bridged composite TiO 2 -BiVO 4 Synthetic method of nano photocatalyst

Method used

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  • Synthesis method of phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst
  • Synthesis method of phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst
  • Synthesis method of phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst

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specific Embodiment approach 1

[0019] Specific implementation mode 1: In this implementation mode, phosphate bridged composite TiO 2 -BiVO 4 The synthetic method of nano photocatalyst is carried out according to the following steps:

[0020] 1. Disperse 1 g of bismuth vanadate into an aqueous phosphoric acid solution with a concentration of 0.001 to 0.01 mol / L, then stir and evaporate to dryness under the condition of heating in a water bath at 80°C, grind, roast at 450°C for 0.5h, and grind to obtain phosphoric acid-modified bismuth vanadate;

[0021] Two, the phosphoric acid-modified bismuth vanadate obtained in step 1 is dispersed in the mixed solution that is made up of 20ml ethanol and 5ml distilled water, drips 0.5~2ml mass concentration under stirring condition and is the nitric acid of 65%, stirs 0.5h, Obtain solution A;

[0022] 3. Disperse 0.01-0.1ml of butyl titanate into 2ml of absolute ethanol and stir for 30min to obtain solution B;

[0023] 4. Add solution B obtained in step 3 dropwise to...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment differs from Embodiment 1 in that the concentration of the phosphoric acid aqueous solution in step 1 is 0.002-0.009 mol / L. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Embodiment 3: This embodiment differs from Embodiment 1 or Embodiment 2 in that the concentration of phosphoric acid aqueous solution in step 1 is 0.003-0.008 mol / L. Others are different from the first or second specific embodiment.

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Abstract

The invention relates to a synthesis method of a phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst, and particularly relates to a synthesis method of a photocatalyst and the method is used for solving the technical problem of poor activity for decomposing bismuth vanadate under irradiation of visible light to produce hydrogen in water. The method comprises the following steps of: firstly, preparing phosphoric acid modified bismuth vanadate; secondly, preparing a solution A; thirdly, preparing a solution B; fourthly, preparing titanium dioxide compound phosphoric acid bridged bismuth vanadate; and fifthly, dispersing the titanium dioxide compound phosphoric acid bridged bismuth vanadate into distilled water, adding chloroplatinic acid, stirring under the irradiation of a xenon lamp with the power of 300w, cleaning, drying and grinding to obtain the phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst. Compared with pure bismuth vanadate, the phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst provided by the invention has the advantages that the service life of a carrier of the phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst is prolonged by 1ms, and the separation efficiency of the carrier is increased by 1.5 times. The phosphoric acid bridged and compounded TiO2-BiVO4 nanometer photocatalyst has high activity for decomposing under the irradiation of the visible light to produce the hydrogen in water.

Description

technical field [0001] The invention relates to a synthesis method of a photocatalyst. Background technique [0002] Hydrogen and solar energy are both clean and renewable energy sources. Using photocatalysts to split water to produce hydrogen under the irradiation of sunlight can convert solar energy into hydrogen energy with high energy density. Among many visible light semiconductor catalysts, bismuth vanadate is favored due to its stable properties, wide spectral absorption range, and low cost. Both the valence and conduction bands of bismuth vanadate are relatively low, so under light excitation, the generated holes have strong oxidation ability, but the generated electrons have poor reduction ability. The reduction ability and lifetime of photogenerated electrons are the key factors affecting the hydrogen production efficiency of photo-splitting water. The reduction ability of photogenerated electrons is poor, and its reactivity with hydrogen ions is poor, which det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/198C01B3/04
CPCY02E60/364Y02E60/36
Inventor 井立强谢明政付宏刚付雪东
Owner HEILONGJIANG UNIV
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