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Tungsten oxide nanorod/titanium carbide quantum dot/indium sulfide nanosheet Z-type heterojunction composite material and preparation method and application thereof

A composite material and quantum dot technology, which is applied in the fields of inorganic nanocomposite materials and photocatalysis to achieve the effect of improving photocatalytic efficiency, increasing contact and improving utilization rate

Active Publication Date: 2020-11-24
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the preparation of two-dimensional layered compound titanium carbide into quantum dots to construct Z-type heterojunction composites for water treatment.

Method used

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  • Tungsten oxide nanorod/titanium carbide quantum dot/indium sulfide nanosheet Z-type heterojunction composite material and preparation method and application thereof
  • Tungsten oxide nanorod/titanium carbide quantum dot/indium sulfide nanosheet Z-type heterojunction composite material and preparation method and application thereof
  • Tungsten oxide nanorod/titanium carbide quantum dot/indium sulfide nanosheet Z-type heterojunction composite material and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 Preparation of titanium carbide quantum dots

[0034] In a centrifuge tube, add 0.8 g of lithium fluoride to 10 mL of 9 mol / L hydrochloric acid and stir for 5 min, then add 0.45 g of titanium carbon aluminide; then stir at room temperature for 24 h for etching, and the reaction product is centrifuged and washed with water until the pH is 6 , re-add deionized water, shake it by hand for 10 minutes to obtain a layered titanium carbide solution; then bubble argon into the titanium carbide solution in the centrifuge tube for 5 minutes, and then freeze and thaw five times: first in a refrigerator at 4 °C Place it for 3 hours, then put it in a -40 °C refrigerator for 3 hours, and then place it at room temperature to thaw, complete one freeze-thaw, and repeat this process four times; Ultrasound at 150 W for 1 h to obtain a solution containing titanium carbide flakes and quantum dots; the solution was filtered three times through a 0.22 μm microporous membrane to filt...

Embodiment 2

[0036] Embodiment 2 The preparation of tungsten trioxide nanorods, the specific steps are as follows:

[0037] Add 0.825 g sodium tungstate dihydrate and 0.4 g sodium chloride into 20 mL deionized water, stir for 30 min, then add 3 mol / L hydrochloric acid solution to the above solution dropwise, and use a pH meter during the dropwise addition Test to make the solution pH=2; stir for another 3 hours; then transfer the solution to the reactor for hydrothermal reaction; After centrifugation and washing, they were placed in a drying oven at 65 °C and dried overnight to obtain tungsten trioxide nanorod powder.

[0038] attached figure 2 It is the scanning electron microscope picture of tungsten trioxide obtained above, and it can be clearly seen from the above picture that tungsten trioxide has a nanorod structure and is uniformly dispersed.

Embodiment 3

[0039] Example 3 Preparation of tungsten oxide nanorod / titanium carbide quantum dot / indium sulfide nanosheet Z-type heterojunction composite material, the specific steps are as follows:

[0040] Take 0.1 g of tungsten trioxide nanorod powder in Example 2 and add it to 120 mL of titanium carbide quantum dot aqueous solution, stir (1000 rpm) in a vacuum environment for 12 h, then let it stand at room temperature for 12 h, and then freeze-dry it The tungsten trioxide nanorod powder loaded with quantum dots was obtained by freeze-drying in a machine. Disperse 57.95 mg (1 mmol) of tungsten trioxide powder loaded with quantum dots into 10 mL of ethylene glycol, and dissolve 205 mg (2.8 mmol) of indium trichloride tetrahydrate in 15 mL of ethylene glycol; Mix in the flask, and then add 79 mg (4.2 mmol) of thioacetamide; then connect the flask to a spherical condenser and a three-way valve, and seal the joint, first use a vacuum pump to remove the air in the flask and condenser, and t...

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Abstract

The invention discloses a tungsten oxide nanorod / titanium carbide quantum dot / indium sulfide nanosheet Z-type heterojunction composite material and a preparation method and application thereof. The preparation method comprises the following steps: preparing titanium carbide quantum dots by utilizing multiple freeze thawing and ultrasonic methods, then placing tungsten trioxide nanorods prepared bya hydrothermal method into a titanium carbide quantum dot aqueous solution, carrying out stirring and then standing to obtain quantum dot loaded tungsten oxide nanorods; and uniformly stirring and mixing an indium compound and a sulfur compound in an ethylene glycol solvent, then adding the quantum dot loaded tungsten oxide nanorods, and performing reflux reaction at constant temperature to obtain the composite material. The titanium carbide quantum dots can provide excellent electron transport channels at different semiconductor interfaces, the light absorption range of the material is widened, and the utilization rate of the material on sunlight is improved. The Z-type heterojunction composite material disclosed by the invention can obviously improve the photocatalytic efficiency, and the performance of removing bisphenol A and hexavalent chromium in a water body under visible light is superior to that of tungsten trioxide / indium sulfide.

Description

technical field [0001] The invention belongs to the technical field of inorganic nanocomposite materials and photocatalysis, and specifically relates to a preparation method of a tungsten oxide nanorod / titanium carbide quantum dot / indium sulfide nanosheet Z-type heterojunction composite material and its effective removal under visible light conditions. Application of bisphenol A and hexavalent chromium in water. Background technique [0002] Sunlight is an inexhaustible source of energy. Photocatalytic degradation of pollutants is one of the most effective methods for treating pollutants in recent years due to its green, energy-saving, and high-efficiency characteristics. With the development of catalytic technology, quantum dot materials have gradually shown strong competitiveness in recent research. Quantum dots are a kind of zero-dimensional nanomaterials, the particle size is generally between 1-100nm, due to the small volume, the quantum confinement will lead to the ex...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/22B01J27/04B01J23/30C02F1/30C02F101/34C02F101/22
CPCB01J27/22B01J27/04B01J23/30C02F1/30C02F2305/10C02F2101/345C02F2101/22B01J35/39C02F1/725B01J37/10B01J37/32B01J37/343B01J35/23
Inventor 路建美李娜君
Owner SUZHOU UNIV
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