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TiO2 photocatalytic composite material as well as preparation method and application thereof

A composite material and photocatalytic technology, applied in the field of TiO2 photocatalytic composite materials and preparation, can solve the problems of low utilization rate of sunlight, restricting photocatalytic activity, reducing the efficiency of photogenerated carriers, etc.

Active Publication Date: 2021-01-08
WUYI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, its disadvantage is that the band gap energy is large, and it can only be excited by ultraviolet light with a short wavelength, and the energy of ultraviolet light in sunlight is only 3-5%, so its utilization rate of sunlight is very low.
In addition, TiO 2 After being excited by light, the generated photogenerated electrons and holes are easy to recombine, which reduces the efficiency of photogenerated carriers, which seriously restricts its photocatalytic activity.

Method used

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  • TiO2 photocatalytic composite material as well as preparation method and application thereof
  • TiO2 photocatalytic composite material as well as preparation method and application thereof
  • TiO2 photocatalytic composite material as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] A kind of TiO 2 Photocatalytic composite material comprising TiO with a thickness of 1.1 nm and a cross-sectional size of 10-15 μm 2 nanosheets; and supported on TiO 2 g-C with an average size of 15 nm on a nanosheet 3 N 4 quantum dots. Its preparation method comprises the following steps:

[0036] S1. Weigh 60mg of TiO 2 Add nanosheets and 10g urea into a beaker, then add 50mL water and stir evenly to obtain a suspension;

[0037] S2. The suspension was heated and evaporated in an oil bath at 80°C to obtain a white solid;

[0038] S3. Transfer the white solid mixture to a 100ml alumina crucible with a cover, then place the crucible in a muffle furnace, gradually raise the temperature to 550°C at a heating rate of 10°C / min, and then calcinate at 550°C for 4h;

[0039] S4. Naturally cool to room temperature, grind the obtained sample again, and the obtained product is marked as 15T10U.

Embodiment 2

[0041] A kind of TiO 2 Photocatalytic composite material comprising TiO with a thickness of 1.1 nm and a cross-sectional size of 10-15 μm 2 nanosheets; and supported on TiO 2 g-C with an average size of 50 nm on a nanosheet 3 N 4 quantum dots. Its preparation method comprises the following steps:

[0042] S1. Weigh 60mg of TiO 2 Add nanosheets and 15g urea into a beaker, then add 50mL water and stir evenly to obtain a suspension;

[0043] S2. The suspension was heated and evaporated in an oil bath at 85°C to obtain a white solid;

[0044]S3. Transfer the white solid mixture to a 100ml covered alumina crucible, then place the crucible in a muffle furnace, gradually heat up to 580°C at a heating rate of 15°C / min, and then calcinate at 580°C for 4h;

[0045] S4. Naturally cool to room temperature, grind the obtained sample again, and the obtained product is marked as 15T15U.

Embodiment 3

[0047] A kind of TiO 2 Photocatalytic composite material comprising TiO with a thickness of 1.1 nm and a cross-sectional size of 10-15 μm 2 nanosheets; and supported on TiO 2 g-C with an average size of 35 nm on the nanosheet 3 N 4 quantum dots. Its preparation method comprises the following steps:

[0048] S1. Weigh 60mg of TiO 2 Add nanosheets and 20g urea into a beaker, then add 50mL water and stir evenly to obtain a suspension;

[0049] S2. The suspension was heated and evaporated in an oil bath at 75°C to obtain a white solid;

[0050] S3. Transfer the white solid mixture to a 100ml covered alumina crucible, then place the crucible in a muffle furnace, gradually heat up to 550°C at a heating rate of 5°C / min, and then calcinate at 550°C for 4h;

[0051] S4. Naturally cool to room temperature, grind the obtained sample again, and the obtained product is marked as 15T20U.

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Abstract

The invention relates to a TiO2 photocatalytic composite material. The surface of the TiO2 photocatalytic composite material comprises TiO2 nanosheets and g-C3N4 quantum dots loaded on the TiO2 nanosheets. The preparation method of the TiO2 photocatalytic composite material comprises the following steps: S1, dissolving TiO2 nanosheets and urea in water, and stirring to form a turbid liquid; S2, heating and evaporating the turbid liquid to obtain a white solid; and S3, calcining the white solid. The invention also relates to application of the photocatalytic composite material in degradation ofrhodamine b. The TiO2 photocatalytic composite material has the advantages of high electron hole separation rate, high photocatalytic efficiency and the like and is applied to degradation of rhodamine b under ultraviolet light, and the rhodamine b degradation efficiency of the TiO2 photocatalytic composite material is 4-10 times that of a conventional TiO2 material.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a TiO 2 Photocatalytic composite materials and preparation methods and their applications. Background technique [0002] Photocatalytic technology can degrade toxic non-biodegradable pollutants into non-toxic small molecules, such as CO, H 2 O and various corresponding inorganic ions to achieve harmlessness. With the development of human society and the massive consumption of fossil energy, environmental pollution has also come one after another, which has become a key issue that people have to consider. Water is a necessary condition for people to survive, so water pollution treatment has become a major concern of human beings. [0003] Rhodamine b is a kind of artificial synthetic dye with bright pink color, an important representative of xanthene dyes, which widely exists in printing and dyeing wastewater. Because this kind of dye is difficult to biodegrade and is c...

Claims

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Application Information

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IPC IPC(8): B01J27/24B01J21/06B01J37/08B82Y20/00B82Y30/00B82Y40/00C02F1/32C09K11/65C02F101/30C02F101/34C02F101/38
CPCB01J27/24B01J21/063B01J37/082B01J37/0036B82Y20/00B82Y30/00B82Y40/00C02F1/32C09K11/65C09K11/0883C02F2101/30C02F2101/34C02F2101/38C02F2305/10C02F2101/308B01J35/39Y02W10/37
Inventor 许成群刘晓露杨嘉乐陈泽源顾凤龙
Owner WUYI UNIV
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