Precious metal/zinc indium sulfide/titanium dioxide nano heterostructure photocatalyst and preparation method thereof

A nano-heterostructure and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, nanotechnology, etc., can solve problems such as limiting quantum yield, wide band gap, and fast recombination of photogenerated carriers. Achieve the effect of improving ultraviolet light absorption efficiency, promoting separation and enhancing performance

Active Publication Date: 2015-09-23
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two fatal shortcomings in this photocatalytic material: (1) The band gap is wide (about 3.2eV), so that the threshold wavelength of its light absorption is less than 400nm, so it can only use ultraviolet light, which accounts for about 4% of solar energy. (2) Its photogenerated carriers recombine quickly, which greatly limits its quantum yield

Method used

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  • Precious metal/zinc indium sulfide/titanium dioxide nano heterostructure photocatalyst and preparation method thereof
  • Precious metal/zinc indium sulfide/titanium dioxide nano heterostructure photocatalyst and preparation method thereof
  • Precious metal/zinc indium sulfide/titanium dioxide nano heterostructure photocatalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0028] 2ml of glacial acetic acid and 2ml of butyl titanate were added to 4.5ml of absolute ethanol, and then 0.4g of polymer polyvinylpyrrolidone was dissolved in the above solution to prepare a butyl titanate / polyvinylpyrrolidone precursor solution. Next, put the precursor solution into a medical syringe with a nozzle with a diameter of 0.4mm, keep the distance between the nozzle and the grounded receiving plate at 12cm, put the copper electrode into the solution and apply a high voltage of 10KV to perform electrospinning, Preparation of butyl titanate / polyvinylpyrrolidone composite nanofibers. Finally, butyl titanate / polyvinylpyrrolidone composite nanofibers were calcined in a muffle furnace at a rate of 2 °C / min to 500 °C for 1 hour to obtain TiO 2 Nanofibers. Prepared TiO 2 Scanning electron micrographs of nanofibers as figure 1 shown. It can be clearly seen from the figure that the prepared TiO 2 The nanofibers have a diameter of 200-300 nm and a length of 10-20 μm....

Embodiment 2

[0032] 1.5 ml of glacial acetic acid and 1.5 ml of butyl titanate were added to 4 ml of absolute ethanol, and then 0.4 g of polymer polyvinyl pyrrolidone was dissolved in the above solution to prepare a butyl titanate / polyvinyl pyrrolidone precursor solution. Next, put the precursor solution into a medical syringe with a nozzle with a diameter of 0.4mm, keep the distance between the nozzle and the grounded receiving plate at 10cm, put the copper electrode into the solution and apply a high voltage of 11KV to perform electrospinning, Preparation of butyl titanate / polyvinylpyrrolidone composite nanofibers. Finally, butyl titanate / polyvinylpyrrolidone composite nanofibers were calcined in a muffle furnace at a rate of 3 °C / min to 500 °C for 0.5 hours to obtain TiO 2 Nanofibers.

[0033] Add 0.13 mmol of zinc acetate dihydrate, 0.26 mmol of indium nitrate hexahydrate, 0.95 mmol of cysteine ​​and 0.0525 mmol of sodium hydroxide into 20 ml of deionized water, and stir magnetically ...

Embodiment 3

[0036] 2ml of glacial acetic acid and 2ml of butyl titanate were added to 4ml of absolute ethanol, and then 0.4g of polymer polyvinylpyrrolidone was dissolved in the above solution to prepare a butyl titanate / polyvinylpyrrolidone precursor solution. Next, put the precursor solution into a medical syringe with a nozzle with a diameter of 0.4mm, keep the distance between the nozzle and the grounded receiving plate at 12cm, put the copper electrode into the solution and apply a high voltage of 10KV to perform electrospinning, Preparation of butyl titanate / polyvinylpyrrolidone composite nanofibers. Finally, butyl titanate / polyvinylpyrrolidone composite nanofibers were calcined in a muffle furnace at a rate of 3 °C / min to 500 °C for 2 hours to obtain TiO 2 Nanofibers.

[0037] Add 0.125 mmol of zinc acetate dihydrate, 0.25 mmol of indium nitrate hexahydrate, 0.8 mmol of cysteine ​​and 0.0625 mmol of sodium hydroxide into 20 ml of deionized water, and stir magnetically for 30 min. ...

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Abstract

The invention discloses a precious metal/zinc indium sulfide/titanium dioxide nano heterostructure photocatalyst, which is characterized in that ultra-thin zinc indium sulfide nanosheets are grown on the surface of titanium dioxide nanofibers, then precious metal nanoparticles are assembled on positive and negative surfaces of the ultra-thin zinc indium sulfide nanosheets, so that precious metal/zinc indium sulfide/titanium dioxide nano heterostructure is hierarchically constructed. The preparation method includes adding glacial acetic acid, butyl titanate and polyvinylpyrrolidone into anhydrous ethanol, preparing butyl titanate/polyvinylpyrrolidone composite nanofibers by electrostatic spinning, and performing high temperature calcination to obtain titanium dioxide nanofibers; adding zinc acetate dihydrate, indium nitrate hexahydrate, cysteine and sodium hydroxide into deionized water, then adding the titanium dioxide nanofibers, and performing hydrothermal reaction to obtain zinc indium sulfide/titanium dioxide heterostructure; and activating the heterostructure in a stannous chloride aqueous solution, and then performing in-situ reduction in a precious metal brine solution. The photocatalytic material is excellent in performance of photocatalytically splitting of water into hydrogen.

Description

technical field [0001] The invention relates to a photocatalyst and a preparation method. Background technique: [0002] With the gradual depletion of fossil fuels such as coal and oil, the problem of energy shortage has become increasingly serious, and it has become a worldwide problem that plagues human existence. The birth of semiconductor photocatalysis technology not only provides a green method for environmental governance, but also opens up a promising new way for the conversion of solar energy and fuel energy. Using semiconductor nanomaterials as photocatalysts can efficiently convert low-density solar energy into high-density chemical energy. For example, hydrogen energy, one of the most ideal energy sources at present, can be obtained through photolysis of water. When it is burned, it can not only release huge energy, but also produce zero-pollution water. On the one hand, it reduces environmental pollution, and on the other hand, it effectively converts solar en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04C01B3/04B82Y30/00
CPCY02E60/36
Inventor 张振翼董斌刘奎朝苑青
Owner DALIAN NATIONALITIES UNIVERSITY
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