WO3-x photocatalyst with visible light region LSPR absorption as well as preparation method and application thereof

A photocatalyst and visible light technology, applied in the direction of physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, etc., can solve the problem of many steps, unrealized LSPR absorption, inability to achieve simple, Low-cost green synthesis and other issues, to achieve the effect of simple preparation process, high-efficiency utilization, and increased free charge concentration

Active Publication Date: 2020-08-07
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the resulting WO 3-x The material has light absorption in a wide range, and its absorption peak is located in the near-infrared region (greater than 700nm), and cannot produce a strong and narrow LSPR absorption band in the visible region
In addition, this preparation strategy has many steps, and raw materials such as mesoporous silica molecular sieves and highly harmful hydrofluoric acid are used, which cannot achieve simple, low-cost, and green synthesis.
[0004] In summary, there is still no WO with strong and narrow LSPR absorption and the absorption peak in the visible region. 3-x Materials, especially WO with LSPR absorption peaks less than 700nm 3-x catalytic material

Method used

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  • WO3-x photocatalyst with visible light region LSPR absorption as well as preparation method and application thereof
  • WO3-x photocatalyst with visible light region LSPR absorption as well as preparation method and application thereof
  • WO3-x photocatalyst with visible light region LSPR absorption as well as preparation method and application thereof

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preparation example Construction

[0039] A WO with LSPR absorption in the visible light region proposed by the present invention 3-x The preparation method of nanosheet photocatalyst is characterized in that, comprises the steps:

[0040] S1. Mix tungsten powder and hydrogen peroxide aqueous solution, stir magnetically until clarified, add isopropanol, transfer the mixed solution to an autoclave, heat up to 150-170°C, react for 10-14h, cool to room temperature, wash, Dry to obtain nano tungsten oxide hydrate;

[0041] S2. Put nano-tungsten oxide hydrate in a reducing atmosphere for heat treatment to obtain WO with LSPR absorption in the visible light region 3-x Nanosheet photocatalyst; wherein, the reducing atmosphere is a mixed gas of hydrogen and argon, and the volume ratio of hydrogen is 3-13%; the heat treatment temperature is 300-500°C.

Embodiment 1

[0044] A WO with LSPR absorption in the visible region 3-x Nano sheet photocatalyst, its preparation process comprises the steps:

[0045] S1. Mix 0.72g tungsten powder and 5ml hydrogen peroxide aqueous solution (the concentration of hydrogen peroxide in the hydrogen peroxide aqueous solution is 30wt%), stir magnetically for 30min until clarification, then add 30ml isopropanol and mix evenly to obtain a mixed solution. The solution is placed in a magnetic high-temperature and high-pressure reactor, heated to 160°C, stirred and reacted at a speed of 700r / min for 12 hours, cooled to room temperature after the reaction, washed with ethanol and dried to obtain nano-tungsten oxide hydrate powder;

[0046] S2. Heat-treat nano-tungsten oxide hydrate powder in a reducing atmosphere for 4 hours to obtain WO with LSPR absorption in the visible light region 3-x Nanosheet photocatalyst; wherein the reducing atmosphere is a mixed gas of hydrogen and argon, and the volume ratio of hydrogen...

Embodiment 2

[0048] A WO with LSPR absorption in the visible region 3-x Nano sheet photocatalyst, its preparation process comprises the steps:

[0049] S1. Mix 0.72g tungsten powder and 5ml hydrogen peroxide aqueous solution (the concentration of hydrogen peroxide in the hydrogen peroxide aqueous solution is 30wt%), stir magnetically for 30min until clarification, then add 30ml isopropanol and mix evenly to obtain a mixed solution. The solution is placed in a magnetic high-temperature and high-pressure reactor, heated to 160°C, stirred and reacted at a speed of 700r / min for 12 hours, cooled to room temperature after the reaction, washed with ethanol and dried to obtain nano-tungsten oxide hydrate powder;

[0050] S2. Heat-treat nano-tungsten oxide hydrate powder in a reducing atmosphere for 4 hours to obtain WO with LSPR absorption in the visible light region 3-x Nanosheet photocatalyst; wherein the reducing atmosphere is a mixed gas of hydrogen and argon, and the volume ratio of hydrogen...

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Abstract

The invention discloses a WO3-x nanosheet photocatalyst with visible light region LSPR absorption as well as a preparation method and application thereof. Tungsten powder, hydrogen peroxide and isopropanol are used as raw materials, a solvothermal method is adopted for preparing a nano tungsten oxide hydrate, then high-temperature reduction is performed to obtain the WO3-x nanosheet photocatalyst,so that LSPR absorption and regulation of WO3-x in a visible light region are achieved, wherein the absorption peak wavelength is smaller than 520 nm. The preparation method comprises the following steps: S1, mixing tungsten powder and a hydrogen peroxide aqueous solution, reacting, adding isopropanol, and heating the reactants to 150-170 DEG C in a high-pressure kettle for reaction to obtain a nano tungsten oxide hydrate; and S2, adding the nano tungsten oxide hydrate in a reducing atmosphere, and carrying out heat treatment to obtain the WO3-x nanosheet photocatalyst with visible light region LSPR absorption. The obtained catalyst has strong LSPR absorption in the whole visible light region, thermal charges generated by plasmon excitation can directly catalyze and degrade organic matters, and the catalytic degradation rate of methyl orange can reach 93%.

Description

technical field [0001] The invention relates to the technical field of nano-semiconductor catalytic materials, in particular to a WO with localized surface plasmon resonance (LSPR) absorption in the visible light region. 3-x Nanosheet photocatalyst, preparation method and application. Background technique [0002] Under the excitation of external light, the free electrons in the metal nanoparticles oscillate collectively, resulting in localized surface plasmon resonance (LSPR), and the collective oscillation of these free electrons leads to enhanced optical absorption and scattering, as well as near-field enhancement. LSPR has a wide range of applications, for example, solar water splitting, solar cells, and surface-enhanced spectroscopy (such as fluorescence spectroscopy and Raman spectroscopy), etc. For noble metal nanocrystals, their LSPRs are located in the visible light region and can fully utilize the energy of sunlight, but their reserves are low and expensive, which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/30C02F1/30C02F101/38
CPCB01J23/30B01J35/004C02F1/30C02F2101/40C02F2305/10
Inventor 唐海宾汤自惠王秀娟
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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