Method for preparing photochemical catalyst applied to degradation of environmental pollutants by using solar energy

A technology for environmental pollutants and photocatalysts, applied in physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of narrow spectral response range, wide band gap, etc. The effect of broadening the absorption wavelength and improving the photocatalytic activity

Inactive Publication Date: 2012-12-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But TiO 2 The energy band structure of the photocatalytic technology has limitations in the promotion process.
It has a wide band gap and a narrow spectral response range (Eg=3.2eV), and can only use the ultraviolet region that accounts for less than 5% of sunlight
For this reason, ZnO is selected as the protective layer material, by 2 -NT S / CdS surface to construct ZnO nanorods to obtain an efficient and stable TiO 2 -NT S / CdS-ZnO solar photocatalyst, but there is no good way to prepare such a catalyst

Method used

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  • Method for preparing photochemical catalyst applied to degradation of environmental pollutants by using solar energy
  • Method for preparing photochemical catalyst applied to degradation of environmental pollutants by using solar energy
  • Method for preparing photochemical catalyst applied to degradation of environmental pollutants by using solar energy

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Prepare 0.05mol / L CdCl 2 and 0.05mol / L Na 2 S precursor solution, to which trisiloxane surfactant was added. Using the vacuum infusion method, TiO with a diameter of 60 nm and a thickness of 5 μm 2 Nanotubes filled with 0.05mol / L CdCl 2 and 0.05mol / L Na 2 S precursor solution, after repeating 3 times, the nanotubes were immersed in the two solutions respectively, and the immersion time was 30s each time. After each removal, the surface solution was wiped dry, and the process was repeated 15 times.

[0033] Prepare 0.2mol / L Zn(NO 3 ) 2 , hexamethylenetetramine aqueous solution, mixed uniformly by volume 1:1, as the precursor solution. with TiO 2 -NT S / CdS as the substrate, placed in a reaction kettle, added 20mL of precursor solution, and reacted in an oven at 90°C for 4h.

[0034] figure 1 and figure 2 Be respectively the TiO selected in embodiment 1 2 Nanotube carrier and the TiO prepared according to the conditions of Example 1 2 -NT S / CdS photocataly...

Embodiment 2

[0036] Prepare 0.05mol / L CdCl 2 and 0.05mol / L Na 2 S precursor solution, to which trisiloxane surfactant was added. Using the vacuum infusion method, TiO with a diameter of 60 nm and a thickness of 5 μm 2 Nanotubes filled with 0.05mol / L CdCl 2 and 0.05mol / L Na 2 S precursor solution, after repeating 3 times, the nanotubes were immersed in the two solutions respectively, and the immersion time was 30s each time. After each removal, the surface solution was wiped dry, and the process was repeated 15 times.

[0037] Prepare 0.01mol / L Zn(NO 3 ) 2 , hexamethylenetetramine aqueous solution, mixed uniformly by volume 1:1, as the precursor solution. with TiO 2 -NT S / CdS as the substrate, placed in a reaction kettle, added 20mL of precursor solution, and reacted in an oven at 90°C for 6h.

[0038] Figure 4 It is the TiO prepared according to the conditions and conditions of Example 2 2 -NT S / CdS-ZnO photocatalyst morphology. Such as Figure 4 As shown, when the precurs...

Embodiment 3

[0041] A method for preparing a photocatalyst applied to solar energy degradation of environmental pollutants, the method is based on TiO 2 Nanotubes are used as the carrier, and CdS is used as the sensitizer to broaden the absorption band of the photocatalyst in the visible region. On TiO 2 -NT S / CdS surface constructs ZnO nanorods as a protective layer to prevent the photocorrosion of CdS, improve the stability and photocatalytic activity, and finally obtain TiO 2 -NT S / CdS-ZnO microstructure and can be applied to photocatalysts for solar degradation of environmental pollutants.

[0042] Described method specifically comprises the following steps:

[0043] (1) Prepare CdCl separately 2 and Na 2 S precursor aqueous solution, so that the concentration is 0.01mol / L, and add 0.5% surfactant trisiloxane of the total volume of the solution (please supplement the amount);

[0044] (2) with TiO 2 Nanotubes as support, TiO 2 The diameter of the nanotube is 50nm, the thickne...

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Abstract

The invention relates to a method for preparing a photochemical catalyst applied to degradation of environmental pollutants by using solar energy, which comprises the following steps of: broadening the absorption band of the photochemical catalyst in a visible area by using an uprightly grown TiO2 nanotube (TiO2-NTs) on a metal titanium matrix as a carrier and using Cds as a sensitizing agent; and constructing a ZnO nanorod on the surface of TiO2-NTs / Cds as a protective layer so as to prevent the optical erosion of Cds efficiently and improve the stability and the photocatalytic activity. Compared with the prior art, the TiO2-NTS / CdS-ZnO microstructural photochemical catalyst prepared by the method has the advantages of responsive efficiency and stability in the solar spectral range and can be applied to treatment of degradation of environmental pollutants by solar energy.

Description

technical field [0001] The invention belongs to the field of material chemistry and relates to a high-efficiency and stable photocatalyst material with response in the solar spectrum range. Background technique [0002] In recent years, among many methods for degrading environmental pollutants, photocatalytic technology has received extensive attention from scholars at home and abroad. It can convert low-density sunlight into high-density chemical energy and electrical energy, directly use sunlight to degrade and mineralize various pollutants in water and air, and the whole process will not produce harmful by-products to human body and environment , has "green" characteristics, so photocatalysis has great potential in environmental purification and new energy development. [0003] Among many semiconductor photocatalysts, TiO 2 It is favored for its high photocatalytic activity, strong oxidation ability, non-toxicity and low cost, and is currently the most widely used photo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J27/04B01J23/06B01J21/06A62D3/17
Inventor 赵国华张亚男雷燕竹李培强
Owner TONGJI UNIV
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