High-flux photo-thermal preparation method and application of defect-adjustable metal oxide

An oxide, high-throughput technology, applied in chemical instruments and methods, catalyst activation/preparation, titanium oxide/hydroxide, etc., can solve the problem of low light utilization rate of metal oxides, uncontrollable defect content, and harsh synthesis conditions and other problems, to achieve the effect of improving utilization efficiency and photocatalytic activity, good photogenerated carrier separation ability, and low cost

Inactive Publication Date: 2021-11-02
XI AN JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems faced in the preparation of metal oxides with existing defect structures, the present invention provides a high-throughput photothermal preparation method and application of defect-controllable metal oxides, which solves the problems of harsh synthesis conditions and energy consumption in the existing synthesis technology. High, complex methods, high equipment requirements, high cost, etc., and solve the problems of low light utilization rate of metal oxides and uncontrollable defect content, so that it can be applied to the field of full-spectrum photocatalysis

Method used

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  • High-flux photo-thermal preparation method and application of defect-adjustable metal oxide
  • High-flux photo-thermal preparation method and application of defect-adjustable metal oxide
  • High-flux photo-thermal preparation method and application of defect-adjustable metal oxide

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Effect test

Embodiment 1

[0028] Take 50mg of titanium dioxide and ultrasonically disperse it in 40mL of deionized water and 10mL of glycerol to obtain a suspension, place the obtained suspension in a closed and heat-retaining reactor for 30min vacuum treatment; then use a xenon lamp with a light intensity of 15sun to - Irradiate the suspension with full spectrum of visible-infrared light for 180 minutes. The temperature of the suspension in the reactor spontaneously increased and maintained at 90 °C under the high-throughput concentrated light irradiation conditions. After the reactor is naturally cooled to room temperature, the suspension is centrifuged, washed with deionized water and vacuum-dried at room temperature to finally obtain titanium dioxide containing defects.

[0029] figure 1 TiO 2 and titanium dioxide containing defects (TiO 2-x -15), it can be seen that the color of the suspension changes from white to blue under high-throughput concentrated light irradiation, which is usually attr...

Embodiment 2

[0034] Effect of light intensity on defect content in titanium dioxide:

[0035]Take 50mg of titanium dioxide and ultrasonically disperse it in 40mL of deionized water and 10mL of glycerol to obtain a suspension, place the obtained suspension in a closed and insulated reactor for vacuum treatment for 30min; then use xenon lamps with a light intensity of 10sun and 5sun respectively , and irradiate the suspension for 180 min with the full spectrum of ultraviolet-visible-infrared light. The temperature of the suspension in the reactor spontaneously increased under 10sun and 5sun concentrated light irradiation and maintained at 79°C and 70°C, respectively. After the reactor was naturally cooled to room temperature, the suspension was centrifuged, washed with deionized water and vacuum-dried at room temperature to finally obtain defect-containing titanium dioxide TiO 2-x -10 and TiO 2-x -5.

[0036] Depend on figure 2 It can be seen that the oxygen vacancies in titanium dioxid...

Embodiment 3

[0038] The effect of light time on the content of defects in titanium dioxide:

[0039] Take 50mg of titanium dioxide and ultrasonically disperse it in 40mL of deionized water and 10mL of glycerol to obtain a suspension, place the obtained suspension in a closed and heat-retaining reactor for 30min vacuum treatment; then use a xenon lamp with a light intensity of 15sun to - Irradiate the suspension with full spectrum of visible-infrared light for 120 min and 60 min, respectively. After the reactor is naturally cooled to room temperature, the suspension is centrifuged, washed with deionized water, and vacuum-dried at room temperature to finally obtain titanium dioxide with different defect contents.

[0040] Depend on Figure 6 It can be seen that the oxygen vacancies in titanium dioxide and Ti 3+ The content of both increases with the increase of the light time, indicating that the content of defects in titanium dioxide can also be effectively controlled by adjusting the lig...

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Abstract

The invention discloses a high-flux photo-thermal preparation method and application of a defect-adjustable metal oxide. The method comprises the following steps: putting a metal oxide into a mixed solution of deionized water and glycerol, and carrying out vacuum treatment and ultraviolet-visible-infrared light full-spectrum irradiation to obtain the metal oxide with adjustable and controllable defect (Ti<3+> and oxygen vacancy) content by adjusting the condensation ratio or illumination time. The metal oxide is one of titanium dioxide, copper oxide, zinc oxide, strontium titanate, tungsten trioxide, cerium oxide and indium trioxide. Compared with a traditional method for generating defects by high-temperature calcination in a reducing atmosphere, the method provided by the invention is simple to operate, green and environment-friendly, low in cost and wide in application range. The defect-adjustable metal oxide prepared by the method can be optimized to obtain high photocatalytic performance by changing the electronic structure and chemical characteristics of a catalyst, and can be applied to the fields of full-spectrum solar water splitting hydrogen production, carbon dioxide reduction and atmosphere and water pollutant treatment.

Description

technical field [0001] The invention belongs to the technical field of semiconductor nanomaterial preparation, and in particular relates to a high-throughput photothermal preparation method and application of defect-controllable metal oxides. Background technique [0002] Metal oxides such as TiO 2 , ZnO and WO 3 As an important semiconductor material, it has been widely used in various photocatalytic processes due to its low price, environmental friendliness, and high chemical stability. The photocatalytic activity of metal oxides mainly depends on their absorption of visible light and infrared light, as well as the separation ability of photogenerated carriers. However, the inherent wide bandgap characteristics of metal oxides make them only able to utilize ultraviolet light and part of visible light, which account for 5% of sunlight. More importantly, the photogenerated electron-hole pairs of metal oxides are very easy to recombine, resulting in low solar energy utiliz...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/047B01J21/06B01J37/34B01D53/86C02F1/30C02F1/72
CPCC01G23/08B01J21/063B01J35/004B01J37/344B01D53/86C02F1/30C02F1/725C01P2004/01C01P2004/04C01P2002/84C01P2002/82C01P2002/80B01D2255/802B01D2255/20707B01D2255/20761B01D2255/20792B01D2255/20776B01D2255/2065C02F2305/10Y02A50/20
Inventor 孙杰马荣李东辉
Owner XI AN JIAOTONG UNIV
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