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Non-stoichiometric tungsten oxide/titanium dioxide hierarchical nano-heterostructure photocatalyst and preparation method

A nano-heterogeneous structure and photocatalyst technology, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve problems such as restricting development, achieve high-efficiency hydrogen production performance, improve light absorption range and Effect of carrier separation efficiency

Inactive Publication Date: 2017-09-15
DALIAN NATIONALITIES UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the photocatalytic material has a wide bandgap (about 3.2eV), and can only use the ultraviolet light that occupies about 4% of the solar energy, which seriously restricts its development in this field.

Method used

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  • Non-stoichiometric tungsten oxide/titanium dioxide hierarchical nano-heterostructure photocatalyst and preparation method
  • Non-stoichiometric tungsten oxide/titanium dioxide hierarchical nano-heterostructure photocatalyst and preparation method
  • Non-stoichiometric tungsten oxide/titanium dioxide hierarchical nano-heterostructure photocatalyst and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0023] 2 ml of glacial acetic acid and 2 ml of butyl titanate were added to 5 ml of absolute ethanol, and then 0.4 g of high molecular weight 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 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 and kept for 2 hours 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 diameter of the nanofiber is 200-400 n...

Embodiment 2

[0027] 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 and kept for 1.5 hours to obtain TiO 2 Nanofibers.

[0028] Add 0.069mmol tungsten hexacarbonyl into 20ml of absolute ethanol, and stir magnetically for 20min to dissolve it. Then, to this solution, add the TiO prepared in step 1) 2 Nanofiber 1...

Embodiment 3

[0030] 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 5 °C / min to 500 °C and kept for 1 hour to obtain TiO 2 Nanofibers.

[0031] Add 0.069mmol of tungsten hexacarbonyl into 20ml of absolute ethanol, and magnetically stir for 30min to dissolve it. Then, to this solution, add the TiO prepared in step 1) 2 Nanofiber 15mg, conti...

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Abstract

The invention discloses a non-stoichiometric tungsten oxide / titanium dioxide hierarchical nano-heterostructure photocatalyst. W18O49 nano-wires grow on TiO2 nano-fiber surfaces to form a W18O49 / TiO2 hierarchical nano-heterostructure. A preparation method of the W18O49 / TiO2 hierarchical nano-heterostructure includes steps: adding glacial acetic acid, butyl titanate and polyvinylpyrrolidone into absolute ethyl alcohol, preparing butyl titanate / polyvinylpyrrolidone composite nano-fibers by the aid of electro-spinning techniques, and performing high-temperature calcination to obtain TiO2 nano-fibers; adding tungsten hexacarbonyl into absolute ethyl alcohol, adding the prepared TiO2 nano-fibers, and performing solvothermal reaction to prepare the W18O49 / TiO2 hierarchical nano-heterostructure. Photocatalyst materials have super-wide spectrum response range and excellent photocatalytic reduction ammonia-borane hydrogenation performance.

Description

Technical field: [0001] The invention relates to a photocatalyst and a preparation method. Background technique: [0002] The rapid development of modern society has an increasing demand for energy. However, the large-scale development and utilization of non-renewable fossil energy has caused the world to face two major problems of energy shortage and environmental pollution. 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, photocatalytic reactions such as photolysis of water or photoinduced reduction of hydrogen-carrying small molecules can obtain one of the most ideal energy sources—hydrogen energy. Because of its high combustion value and non-polluting use process, it is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30B01J35/06C01B3/06
CPCC01B3/068B01J23/30C01B2203/1088B01J35/39B01J35/58Y02E60/36
Inventor 张振翼姜小艺吕娜刘奎朝董斌
Owner DALIAN NATIONALITIES UNIVERSITY
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