Ultraviolet-visible-near infrared responded PbS/TiO2 nanotube aggregation microsphere heterostructure as well as preparation method and application thereof

A technology of near-infrared photoresponse and near-infrared light, applied in chemical instruments and methods, hydrogen production, chemical/physical processes, etc. Form a tight combination and other issues to achieve the effects of good light absorption performance, low cost, low energy consumption and low cost

Inactive Publication Date: 2019-02-22
SUZHOU INSTITUE OF WUHAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the spectral response range of the above research is narrow, and the visible-near-infrared and other low-energy photons in sunlight cannot be fully utilized, so that sunlight cannot be effectively used to realize photocatalytic hydrogen production.
[0006] In addition, the literature survey results show that current domestic research mainly focuses on PbS QDs sensitized TiO 2 On the one hand, toxic raw materials such as mercaptopropionic acid, thioglycolic acid, and thiolactic acid are used as stabilizers in the synthesis process of PbSQDs, and PbS QDs and TiO 2 Just rely on simple mechanical stirring to mix together, the two do not form a tight combination, which is not conducive to the rapid transfer of electrons in the photocatalytic process, thus affecting the utilization efficiency of sunlight and its photocatalytic effect

Method used

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  • Ultraviolet-visible-near infrared responded PbS/TiO2 nanotube aggregation microsphere heterostructure as well as preparation method and application thereof
  • Ultraviolet-visible-near infrared responded PbS/TiO2 nanotube aggregation microsphere heterostructure as well as preparation method and application thereof
  • Ultraviolet-visible-near infrared responded PbS/TiO2 nanotube aggregation microsphere heterostructure as well as preparation method and application thereof

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Experimental program
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Effect test

Embodiment 1

[0042] 8.0 mL of H 2 o 2 The solution was added dropwise to 60mL of NaOH solution, and then 0.5g of TiO 2 Nano-powder, after stirring for 30min, transfer the suspension to a 85mL reaction kettle, and heat at 160°C for 2h. The hydrothermal product was washed three times with deionized water and ethanol respectively, and then 100 mL of HCl solution was added for ion exchange for 12 hours. After centrifugation, it was washed again with water and absolute ethanol respectively. After drying, it was calcined at 500°C for 3h in the air to obtain ATNMS.

[0043] Add 0.1 g of the above ATNMS to 100 mL of water and stir for 5 min to prepare a suspension. Add 7.5 mg of cysteine ​​to the suspension and adjust the pH of the solution to 4, continue stirring for 1 h, then add 0.02 mL of Pb(NO 3 ) 2 solution, after stirring for 30 min, the product was collected by rotary evaporation. The collected samples were calcined at 500 °C for 3 h in an Ar atmosphere to obtain a PbS / ATNMS heteroju...

Embodiment 2

[0047] 8.0 mL of H 2 o 2 The solution was added dropwise to 60mL of NaOH solution, and then 0.5g of TiO 2 Nano-powder, after stirring for 30min, transfer the suspension to a 85mL reaction kettle, and heat at 160°C for 2h. The hydrothermal product was washed three times with deionized water and ethanol respectively, and then 100 mL of HCl solution was added for ion exchange for 12 hours. After centrifugation, it was washed again with water and absolute ethanol respectively. After drying, it was calcined at 500°C for 3h in the air to obtain ATNMS.

[0048] Add 0.1 g of the above ATNMS to 100 mL of water and stir for 5 min to prepare a suspension. Add 7.5 mg of cysteine ​​to the suspension and adjust the pH of the solution to 4, continue to stir for 1 h, then add 0.06 mL of Pb(NO 3 ) 2 solution, after stirring for 30 min, the product was collected by rotary evaporation. The collected samples were calcined at 500°C for 3 h in an Ar atmosphere to obtain a PbS / ATNMS heterojunc...

Embodiment 3

[0052] 8.0 mL of H 2 o 2 The solution was added dropwise to 60mL of NaOH solution, and then 0.5g of TiO 2 Nano-powder, after stirring for 30min, transfer the suspension to a 85mL reaction kettle, and heat at 160°C for 2h. The hydrothermal product was washed three times with deionized water and ethanol respectively, and then 100 mL of HCl solution was added for ion exchange for 12 hours. After centrifugation, it was washed again with water and absolute ethanol respectively. After drying, it was calcined at 500°C for 3h in the air to obtain ATNMS.

[0053] Add 0.1 g of the above ATNMS to 100 mL of water and stir for 5 min to prepare a suspension. Add 7.5 mg of cysteine ​​to the suspension and adjust the pH of the solution to 4, continue stirring for 1 h, then add 0.10 mL of Pb(NO 3 ) 2 solution, after stirring for 30 min, the product was collected by rotary evaporation. The collected samples were calcined at 500°C for 3 h in an Ar atmosphere to obtain a PbS / ATNMS heterojun...

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Abstract

The invention discloses an ultraviolet-visible-near infrared responded PbS / TiO2 nanotube aggregation microsphere heterostructure as well as a preparation method and an application thereof. The ultraviolet-visible-near infrared responded PbS / TiO2 nanotube aggregation microsphere heterostructure provided by the invention has the characteristics that the heterostructure can be porous microsphere particles which are obtained by enabling PbS nanocrystals to be distributed on the surfaces of TiO2 nanotubes in TiO2 nanotube aggregation microspheres, wherein the particle diameter range of each PbS nanocrystal is 25nm to 36nm, the particle size of the TiO2 nanotube is not more than 10nm, and the diameter distribution of the aggregation microspheres is within the range of 0.2 micron to 7 micron. Thebonding force between the PbS and the TiO2 nanotube in the heterostructure is strong, and the heterostructure has good ultraviolet-visible-near infrared responded photocatalytic hydrogen production activity, and higher hydrogen production is almost realized in the full spectrum range.

Description

technical field [0001] The invention discloses a PbS / TiO with ultraviolet-visible-near-infrared photoresponse 2 The nanotube agglomerated microsphere heterojunction, its preparation method and application, belong to the technical field of nano photocatalytic material preparation and hydrogen production application technology. Background technique [0002] Energy is the material basis for the survival and development of human beings, and it is also an important strategic resource for national economic development. At present, the massive development and utilization of fossil energy such as oil, coal and natural gas has led to the serious deterioration of the human ecological environment, while hydrogen energy is a new type of energy with abundant reserves and no pollution. As an energy carrier, hydrogen has high energy density, can be stored and transported, and the only product after combustion is water, which does not pollute the environment. Therefore, hydrogen energy is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/04B01J35/00B01J35/02B01J35/10C01B3/04
CPCB01J27/04B01J35/004B01J35/006B01J35/0073B01J35/026B01J35/1019C01B3/042Y02E60/36
Inventor 彭天右汪进明
Owner SUZHOU INSTITUE OF WUHAN UNIV
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