Preparation method of heterojunction mvo4 and tio2 composite photocatalytic fiber

A composite photocatalysis and heterojunction technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of high carrier recombination probability and difficult high efficiency Using solar energy, limiting photocatalytic efficiency and other issues, to achieve the effect of reduced band gap energy, simple and easy-to-control preparation method, and high-efficiency photocatalytic degradation

Inactive Publication Date: 2016-02-03
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in long-term studies, it was found that TiO 2 As a photocatalyst, there are inherent defects: (1) the band gap is wide, and it only responds in the ultraviolet range, so it is difficult to efficiently use solar energy; (2) the carrier recombination probability is high, which limits the photocatalytic performance; ( 3) Traditional micro-nano TiO 2 It is difficult to recycle the powder after use
However, MVO 4 The generated photogenerated electron-hole pairs are easy to recombine in the bulk phase and surface of the catalyst, and the photocatalytic activity is not high

Method used

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  • Preparation method of heterojunction mvo4 and tio2 composite photocatalytic fiber
  • Preparation method of heterojunction mvo4 and tio2 composite photocatalytic fiber
  • Preparation method of heterojunction mvo4 and tio2 composite photocatalytic fiber

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] (1) Measure 20mL of HF solution with a mass fraction of 4% and put it into a 100mL stainless steel hydrothermal kettle lined with a polytetrafluoroethylene reaction tube, and insert a polytetrafluoroethylene sieve net at the top of the reaction tube, the sieve net The aperture of the sieve is 4mm, and the opening rate is 42%; use tweezers to dope 75mg Si into TiO 2 Spread the fiber raw material evenly on the sieve net, seal the hydrothermal reaction kettle and transfer it to an oven, and conduct a hydrothermal reaction at 90°C for 4 hours. After the reaction, take out the Si-doped TiO 2 The fibers were washed three times with deionized water and absolute ethanol to obtain roughened Si-doped TiO 2 fiber, spare.

[0041] figure 1 roughened TiO 2 Scanning electron microscope image of a fiber.

[0042] (2) Weigh 0.0511gIn(NO 3 ) 3 and 0.0451g vanadyl acetylacetonate (0.0511gIn(NO 3 ) 3 , 0.0451g vanadyl acetylacetonate and 75mg Si-doped TiO with roughened surface 2...

Embodiment 2

[0048] (1) The difference between this step and step (1) in Example 1 is to weigh 150mg Si-doped TiO 2 The fiber raw material is evenly spread on the sieve mesh, and the Si-doped TiO with roughened surface is obtained. 2 fiber;

[0049] (2) Weigh 0.1218gIn(NO 3 ) 3 With 0.0716g vanadyl acetylacetonate (0.1218gIn(NO 3 ) 3 , 0.0716g vanadyl acetylacetonate and 150mg surface-roughened Si-doped TiO 2 The molar ratio of the fiber is 1.5:1:7) was successively added and dissolved in 30 mL of absolute ethanol, and magnetically stirred for 1 hour to obtain the indium vanadate precursor solution A. Take by weighing the surface-roughened TiO that step (1) makes 2 150 mg of fiber was placed in the above-mentioned solution A, and ultrasonically oscillated for 30 minutes to prepare multi-phase mixed solution B.

[0050] (3) This step is the same as step (3) in Example 1.

[0051] (4) This step is the same as step (4) in Example 1. Adopt the microwave hydrothermal reaction identical...

Embodiment 3

[0054] (1) Measure 20 mL of HF solution with a mass fraction of 6% and transfer it to 100 mL of the aforementioned hydrothermal reaction kettle, insert a sieve mesh, and use tweezers to dope 130 mg of Si into TiO 2 Spread the fiber raw material evenly on the sieve net, seal the hydrothermal reaction kettle and transfer it to an oven, and conduct a hydrothermal reaction at 100°C for 3 hours. After the reaction, take out the Si-doped TiO 2 The fibers were washed three times with deionized water and absolute ethanol respectively to obtain roughened Si-doped TiO 2 fiber, spare.

[0055] (2) Weigh 0.0924gFe(NO 3 ) 3 With 0.0716g vanadyl acetylacetonate (0.0924gFe(NO 3 ) 3 Doped TiO with 0.0716 g vanadyl acetylacetonate and 130 mg surface-roughened Si 2 The molar ratio of fiber is 1.5:1:6) was successively added and dissolved in 30mL of absolute ethanol, and magnetically stirred for 1 hour to obtain FeVO 4 Precursor A. Take by weighing the surface-roughened TiO that step (1) ...

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PUM

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Abstract

The invention discloses a preparation method of heterojunction type MVO4 and TiO2 composite photocatalysis fiber, which comprises the following steps: (1) Si-doped TiO2 fiber is subjected to hydro-thermal treatment to obtain Si-doped TiO2 fiber with coarse surfaces; (2) according to the molar ratio of (1-1.5):1:(5.5-7), M(NO3)3, vanadium(IV)oxy acetylacetonate and the Si-doped TiO2 fiber with coarse surfaces are weighed respectively and dissolved in absolute ethyl alcohol to obtain a multiphase mixed liquor; (3) the multiphase mixed liquor is subjected to microwave hydrothermal reaction and cooled to be at the room temperature, and the fiber is taken out and washed to obtain MVO4 and TiO2 fiber composite precursor; (4) the fiber composite precursor obtained in the step (3) is subjected to thermal treatment to obtain the MVO4 and TiO2 composite photocatalysis fiber grown on the surface of the TiO2 fiber. The preparation method is simple and easy to control, the visible-light response of the TiO2 fiber is expanded, sunlight can be effectively converted and utilized, the band-gap energy of the MVO4 / TiO2 fiber can be remarkably reduced, the compound probability of photon-generated carriers is lowered, and favorable photocatalysis efficiency is showed.

Description

technical field [0001] The present invention relates to a vanadate (MVO 4 ) and titanium dioxide (TiO 2 ) The preparation method of composite photocatalytic fiber belongs to the technical field of fiber photocatalytic material preparation. Background technique [0002] Since TiO 2 Since it was used as a photocatalyst to treat pollutants in water, it has attracted much attention because of its stable physical and chemical properties, safety, non-toxicity, and low price. It has been widely used in many fields of photocatalytic water treatment research and application. However, in long-term studies, it was found that TiO 2 As a photocatalyst, there are inherent defects: (1) the band gap is wide, and it only responds in the ultraviolet range, so it is difficult to efficiently use solar energy; (2) the carrier recombination probability is high, which limits the photocatalytic performance; ( 3) Traditional micro-nano TiO 2 It is difficult to recycle the powder after use. All...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/22B01J23/847C02F1/30
CPCY02W10/37
Inventor 包南尹泽张婕张成禄张岩香
Owner SHANDONG UNIV
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