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Preparation method for ternary-system TiO2/WS2/g-C3N4 composite photocatalyst with visible-light activity

A ternary system, g-c3n4 technology, used in physical/chemical process catalysts, chemical instruments and methods, light water/sewage treatment, etc. Harsh and other problems, to achieve the effect of promoting separation efficiency, good photocatalytic activity and visible light utilization, and simple operation

Inactive Publication Date: 2016-03-30
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Anatase Phase TiO with Excellent Photocatalytic Activity 2 The energy gap width is 3.2eV, and it can only absorb ultraviolet light with a wavelength of less than 385nm in sunlight, and the utilization rate of sunlight is less than 5%.
Composite sensitizer on TiO 2 The modification effect is remarkable, but the reported preparation method is complex and the preparation conditions are harsh

Method used

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  • Preparation method for ternary-system TiO2/WS2/g-C3N4 composite photocatalyst with visible-light activity
  • Preparation method for ternary-system TiO2/WS2/g-C3N4 composite photocatalyst with visible-light activity
  • Preparation method for ternary-system TiO2/WS2/g-C3N4 composite photocatalyst with visible-light activity

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Put 2.5g of thiourea and 2.5g of dicyandiamide into a mortar and grind thoroughly to obtain a uniform mixture, place the mixture in a muffle furnace at 500°C for calcination for 1 hour, then raise the temperature to 550°C and continue calcining for 2 hours, naturally Cool to room temperature, after grinding, obtain graphene-like carbon nitride (g-C 3 N 4 ).

[0030] (2) Add 0.02gWS with a mass ratio of 4.0% to 25mL hydrochloric acid ethanol solution (hydrochloric acid volume fraction is 12%) 2 (average particle size is 6μm) and 0.5gg-C 3 N 4 , sonicated for 20 min to obtain a dispersion. Transfer the dispersion liquid to a 25mL hydrothermal reaction kettle, and hydrothermally treat it in an oven at 80°C for 10 hours. get WS 2 / g -C 3 N 4 Complex.

[0031] (3) Prepare 16mL of 0.4mol / L TiCl 4 Ethanol solution in a 100mL beaker, according to WS 2 / g -C 3 N 4 :TiO 2 =5wt% Add 0.032g of WS to the ethanol solution 2 / g -C 3 N 4 The composite was ultrasoni...

Embodiment 2

[0035] (1) Put 2.5g of thiourea and 2.5g of dicyandiamide into a mortar and grind thoroughly to obtain a homogeneous mixture, place the mixture in a muffle furnace at 500°C for 1h, then heat up to 550°C for 2h, and cool naturally To room temperature, after grinding, obtain graphene-like carbon nitride (g-C 3 N 4 ).

[0036] (2) Add 0.02gWS with a mass ratio of 4.0% to 25mL hydrochloric acid ethanol solution (hydrochloric acid volume fraction is 12%) 2 (average particle size is 6μm) and 0.5gg-C 3 N 4 , sonicated for 20 min to obtain a dispersion. Transfer the dispersion liquid to a 25mL hydrothermal reaction kettle, and hydrothermally treat it in an oven at 80°C for 10 hours. WS available 2 / g -C 3 N 4 Complex.

[0037] (3) Prepare 16mL of 0.4mol / L TiCl 4 Ethanol solution in a 100mL beaker, according to WS 2 / g -C 3 N 4 :TiO 2 =7wt% Add 0.045g of WS to the ethanol solution 2 / g -C 3 N 4 The complex was ultrasonicated for 60 min at room temperature to obtain a m...

Embodiment 3

[0041] (1) Put 2.5g of thiourea and 2.5g of dicyandiamide into a mortar and grind thoroughly to obtain a homogeneous mixture, place the mixture in a muffle furnace at 500°C for 1h, then heat up to 550°C for 2h, and cool naturally To room temperature, after grinding, obtain graphene-like carbon nitride (g-C 3 N 4 ).

[0042] (2) Add 0.02gWS with a mass ratio of 4.0% to 25mL hydrochloric acid ethanol solution (hydrochloric acid volume fraction is 12%) 2 (average particle size is 6μm) and 0.05gg-C 3 N 4 , sonicated for 20 min to obtain a dispersion. Transfer the dispersion liquid to a 25mL hydrothermal reaction kettle, and hydrothermally treat it in an oven at 80°C for 10 hours. get WS 2 / g -C 3 N 4 Complex.

[0043] (3) Prepare 16mL of 0.4mol / L TiCl 4 Ethanol solution in a 100mL beaker, according to WS 2 / g -C 3 N 4 :TiO 2 =9wt% Add 0.058g of WS to the ethanol solution 2 / g -C 3 N 4 The composite was ultrasonicated for 60 min at room temperature to obtain a mixe...

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Abstract

The invention discloses a preparation method for a ternary-system TiO2 / WS2 / g-C3N4 composite photocatalyst with visible-light activity. The method comprises employs a cyanamide-thiourea mixture as a raw material, and preparing carbon nitride with a graphene-like structure by employing high-temperature calcining; then under an acidic condition, employing tungsten disulfide as a complexing compound, and employing an ultrasonic-assisted hydrothermal process to obtain a WS2 / g-C3N4 complex; and finally taking the WS2 / g-C3N4 complex as a photosensitization agent, taking TiCl4 as a titanium source, and employing an ultrasonic-assisted hydrothermal process to prepare the TiO2 / WS2 / g-C3N4 composite photocatalyst. The preparation method possesses the advantages of simple operation, relatively low cost, good controllability and the like, and is widely applicable to preparation of carbon-nitride series composite photocatalysts. The TiO2 / WS2 / g-C3N4 composite photocatalyst shows excellent photocatalysis degradation activity, and possesses important application prospect in fields of purification of organic sewages and waste gases, and the like.

Description

technical field [0001] The invention belongs to the technical field of titanium dioxide photocatalysis chemical industry, and in particular relates to a preparation method of a ternary system TiO2 / WS2 / g-C3N4 composite photocatalyst with visible light activity. Background technique [0002] With the continuous development of social economy, the problem of environmental pollution has become increasingly prominent, and the solution to the problem of water pollution has become the focus of sustainable social and economic development. Semiconductor nanomaterials have become an important way to solve water pollution because of their abundant sources, low price, excellent stability and photocatalytic activity. TiO 2 It was first discovered by Japanese scientists Fujishima and Honda.K using a single crystal as an electrode to photoelectrically split water (Nature, 1972, 238(5358): 37-39). Since then, researchers have conducted in-depth research on the properties of semiconductor n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/38
CPCY02W10/37B01J27/24C02F1/30C02F2101/308C02F2101/38C02F2305/10
Inventor 肖新颜郑莉莉
Owner SOUTH CHINA UNIV OF TECH
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