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Sunlight responding nano hetero-structure photocatalyst and preparation method thereof

A nano-heterostructure, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve problems such as low photocatalytic efficiency and achieve improved Solar photocatalytic efficiency, broadening the photoresponse range, and the effect of enhanced absorption

Inactive Publication Date: 2014-04-09
INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention mainly lies in overcoming TiO 2 Due to the shortcomings of nanomaterials such as weak absorption of sunlight and easy recombination of photogenerated electron-hole pairs, resulting in low photocatalytic efficiency, it is proposed to use narrow bandgap semiconductor V 2 o 5 and narrow bandgap semiconductor Ag 2 O and TiO 2 Coupling method to prepare Ag with high solar light absorption rate 2 O / TiO 2 / V 2 o 5 Nano-heterostructured materials to enhance their solar photocatalytic efficiency

Method used

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  • Sunlight responding nano hetero-structure photocatalyst and preparation method thereof
  • Sunlight responding nano hetero-structure photocatalyst and preparation method thereof
  • Sunlight responding nano hetero-structure photocatalyst and preparation method thereof

Examples

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Effect test

Embodiment 1

[0039] TiO 2 / V 2 o 5 Preparation of nanofibers: Mix 0.5g tetrabutyl titanate, 0.2g polyvinylpyrrolidone (PVP, average molecular weight: 1300000), 0.75g absolute ethanol, 0.45g dimethylacetamide (DMAC) and 1.25g glacial acetic acid And fully stirred for 20 minutes to obtain a uniform PVP / titanate solution, which was recorded as solution A; then 1.2g of polyvinylpyrrolidone (PVP, average molecular weight: 1300000), 0.4g of vanadyl diacetylacetonate (VO(acac) 2 ) and 7.0g dimethylacetamide (DMAC) were mixed and fully stirred for 20min, which was recorded as solution B; finally, solution A and solution B were mixed and fully stirred for 1h to obtain a uniform PVP / titanate / VO(acac ) 2 A mixed solution in which the Ti / V atomic ratio is 1:1; viscous PVP / titanate / VO(acac) 2 The mixed solution is spun to obtain nanofibers. The specific parameters of electrospinning are as follows: the inner diameter of the electrospinning needle is 0.4mm, the distance between the bottom of the nee...

Embodiment 2

[0043] TiO 2 / V 2 o 5 Preparation of nanofibers: 1.0g tetrabutyl titanate, 0.4g polyvinylpyrrolidone (PVP, average molecular weight: 1300000), 1.5g absolute ethanol, 0.9g dimethylacetamide (DMAC) and 2.5g glacial acetic acid were mixed And fully stirred for 20 minutes to obtain a uniformly mixed PVP / titanate solution, which was recorded as solution A; then 1.2g of polyvinylpyrrolidone (PVP, average molecular weight: 1300000), 0.4g of vanadyl diacetylacetonate (VO(acac) 2 ) and 7.0g dimethylacetamide (DMAC) were mixed and fully stirred for 20min, which was recorded as solution B; finally, solution A and solution B were mixed and fully stirred for 1h to obtain a uniform PVP / titanate / VO(acac ) 2 A mixed solution in which the Ti / V atomic ratio is 2:1; the viscous PVP / titanate / VO(acac) 2 The mixed solution is spun to obtain nanofibers. The specific parameters of electrospinning are as follows: the inner diameter of the electrospinning needle is 0.4mm, the distance between the b...

Embodiment 3

[0047] TiO 2 / V 2 o 5 Preparation of nanofibers: 2.0g tetrabutyl titanate, 0.8g polyvinylpyrrolidone (PVP, average molecular weight: 1300000), 3.0g absolute ethanol, 1.8g dimethylacetamide (DMAC) and 5.0g glacial acetic acid were mixed And fully stirred for 20 minutes to obtain a uniformly mixed PVP / titanate solution, which was recorded as solution A; then 1.2g of polyvinylpyrrolidone (PVP, average molecular weight: 1300000), 0.4g of vanadyl diacetylacetonate (VO(acac) 2 ) and 7.0g of dimethylacetamide (DMAC) were mixed and fully stirred for 20 minutes, which was recorded as solution B; mixed with solution A and solution B and fully stirred for 1 hour, a uniform PVP / titanate / VO(acac) 2 Mixed solution; wherein the Ti / V atomic ratio is 4:1. Viscous PVP / titanate / VO(acac) was synthesized by electrospinning 2 The mixed solution is spun to obtain nanofibers. The specific parameters of electrospinning are as follows: the inner diameter of the electrospinning needle is 0.4mm, the ...

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Abstract

The invention provides a sunlight full-spectrum responding Ag2O / TiO2 / V2O5 nano hetero-structure photocatalyst and a preparation method thereof. The preparation method is characterized by comprising the following steps: mixing tetrabutyl titanate, polyvinylpyrrolidone, absolute ethanol, dimethyl acetamide and glacial acetic acid so as to obtain a solution A, mixing vanadium(IV) oxide acetylacetonate, polyvinylpyrrolidone and dimethyl acetamide so as to obtain a solution B, mixing the solution A and the solution B so as to obtain a polyvinylpyrrolidone / titanate / vanadium(IV) oxide acetylacetonate mixed solution, spinning the mixed solution by an electro-spinning method so as to obtain TiO2 / V2O5 nano fibers, then soaking AgNO3 and the TiO2 / V2O5 nano fibers in deionized water, injecting a NaOH solution into the deionized water, and drying so as to obtain the Ag2O / TiO2 / V2O5 nano hetero-structure photocatalyst. The Ag2O / TiO2 / V2O5 nano hetero-structure photocatalyst can well absorb lights in the ultraviolet zone, visible zone, and near infrared zone; at the same time, energy bands of the Ag2O, TiO2, and V2O5 are reasonably matched, thus the photo-produced electronic cavities can be effectively separated, so the Ag2O / TiO2 / V2O5 nano hetero-structure photocatalyst has a very high sunlight catalytic activity.

Description

technical field [0001] The invention relates to a solar photocatalyst that can respond to ultraviolet, visible and near-infrared light at the same time, specifically Ag that responds to the full spectrum of sunlight 2 O / TiO 2 / V 2 o 5 Nano-heterostructure photocatalyst and preparation method thereof. Background technique [0002] In recent years, semiconductor photocatalysts have attracted much attention due to their wide applications in air purification, water purification, antibacterial, bactericidal, antifog, antifouling, self-cleaning, and hydrogen production. Among many semiconductor photocatalysts, TiO 2 It has become one of the widely researched photocatalysts because of its high activity, good stability, harmlessness to human body, long duration of action, many times of reaction, low cost, and ability to work under normal temperature and pressure. But TiO 2 The quantum efficiency is low, and the photogenerated electron-hole pairs are easy to recombine; and beca...

Claims

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Application Information

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IPC IPC(8): B01J23/68B01J35/06
Inventor 王媛刘利新黄元杰操秀霞李绪海徐亮孟川民祝文军
Owner INST OF FLUID PHYSICS CHINA ACAD OF ENG PHYSICS
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