Titanium dioxide-based nano-composite photocatalyst for photocatalytic degradation under visible light irradiation and application of titanium dioxide-based nano-composite photocatalyst

A titanium dioxide and nanocomposite technology, applied in the field of photocatalyst, can solve problems such as the limitation of photocatalytic degradation efficiency, and achieve the effects of improving performance, increasing specific surface area, and improving degradation rate

Pending Publication Date: 2022-06-03
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But, this kind method is because its absorption light band is in ultraviolet region, and the ultraviolet light in daylight is seldom (accounting for only about 5%), and visible light accounts for about 45% or so.
Therefore, the photocatalytic degradation efficiency of TiO is limited

Method used

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  • Titanium dioxide-based nano-composite photocatalyst for photocatalytic degradation under visible light irradiation and application of titanium dioxide-based nano-composite photocatalyst
  • Titanium dioxide-based nano-composite photocatalyst for photocatalytic degradation under visible light irradiation and application of titanium dioxide-based nano-composite photocatalyst
  • Titanium dioxide-based nano-composite photocatalyst for photocatalytic degradation under visible light irradiation and application of titanium dioxide-based nano-composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037]Dissolve 1.065g of isopropyl titanate in ethanol to obtain an isopropyl titanate solution with a concentration of 0.05mol / L, disperse 0.084mL of ethyl silicate into the above system, and stir electromagnetically at 1000 rpm for 45 minutes ; Dissolve 0.0081g of cerium nitrate into the above-mentioned liquid, disperse ultrasonically for 45 minutes, then transfer it to a polytetrafluoroethylene-lined autoclave, first rise to 100°C at 10°C / min, then 4°C / min Raised to 175°C and held for 12h. Cooled to room temperature, the obtained solid was separated by suction filtration, dried in vacuum drying (-0.1MPa) at 60° for 12h to obtain a photocatalyst, denoted as C 0.5 S 10 T-0.05M.

[0038] XRD results show that the C prepared in Example 1 0.5 S 10 T-0.05M is anatase phase, and no other impurity peaks are detected in its XRD diffraction pattern, indicating that the prepared samples have high purity (see figure 1 ). In addition, the composite photocatalyst has good high temp...

Embodiment 2～4

[0041] The difference from Example 1 is: the added amounts of cerium nitrate are 0.0036g, 0.0178g, and 0.356g, respectively, and the prepared photocatalysts are respectively denoted as C 0.2 S 10 T-0.05M, C 1.0 S 10 T-0.05M, C 2.0 S 10 T-0.05M.

[0042] The photocatalysts prepared in Examples 1 to 4 and the undoped pristine TiO were measured by UV-Vis diffuse reflectance spectroscopy. 2 (PT) the ability to absorb light, such as image 3 As shown, it can be seen that the photocatalysts prepared in Examples 1-4 have obvious visible light absorption.

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Abstract

The invention discloses a titanium dioxide-based nano-composite photocatalyst for photocatalytic degradation under visible light irradiation and application of the titanium dioxide-based nano-composite photocatalyst. The preparation method of the titanium dioxide-based nano-composite photocatalyst comprises the following steps: dissolving a titanium-containing precursor into a solvent to obtain a titanium-containing solution, then adding a silicon-containing compound and uniformly stirring, and finally adding rare earth salt and dissolving to obtain a mixed solution; and carrying out a hot-pressing reaction on the mixed solution under a closed condition, cooling to room temperature after the reaction is completed, carrying out suction filtration to obtain a solid, and drying the solid to obtain the titanium dioxide-based nano composite photocatalyst. The doping amount of the rare earth in the titanium dioxide-based nano composite photocatalyst accounts for 0.2-2.0 mol%, and the doping amount of the silicon accounts for 5.0-20 mol%. The rare earth, the silicon oxide and other components are doped into the nano titanium dioxide crystal, so that on one hand, the specific surface area of the composite photocatalyst is remarkably increased, and on the other hand, the light absorption spectrum of the photocatalyst is expanded to a visible light region, and the performance of removing VOCs (volatile organic compounds) such as formaldehyde is greatly improved.

Description

technical field [0001] The invention relates to the technical field of photocatalysts, in particular to a titanium dioxide-based nanocomposite photocatalyst for photocatalytic degradation by visible light irradiation and its application. Background technique [0002] Photocatalysts, also known as photocatalysts, are a class of semiconductor materials with photocatalytic properties. Common photocatalysts include inorganic photocatalysts and organic photocatalysts, and more commonly used photocatalysts are transition metal oxides. Photocatalysts are one of the materials used to control environmental pollution and utilize solar energy for energy conversion. Under the irradiation of light, photocatalysts will produce reactive oxygen species with strong oxidizing ability, including hydroxyl radicals ( OH), superoxide radicals ( O 2 - ) and singlet oxygen ( 1 O 2 ). These reactive oxygen species have strong photocatalytic oxidation ability, which can oxidatively decompose var...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/06B01J21/08B01J23/10B01J35/02B01J35/10B01D53/86B01D53/72B01D53/44
CPCB01J21/063B01J23/10B01J35/023B01J35/1038B01J35/1061B01J35/1019B01J35/004B01J21/08B01D53/8687B01D53/8668B01D2259/802B01D2257/708Y02W10/37
Inventor 陈其凤郑鹏胡勋
Owner UNIV OF JINAN
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