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Preparation method and application of visible-light responsive ternary composite photocatalyst

A ternary composite, photocatalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, chemical/physical processes, etc., can solve undiscovered problems, achieve short reaction time, reduce energy consumption, and improve separation efficiency Effect

Inactive Publication Date: 2017-08-08
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] So far, no one has been found to prepare NGQDs@g-C 3 N 4 / Bi 2 WO 6 composite material

Method used

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  • Preparation method and application of visible-light responsive ternary composite photocatalyst
  • Preparation method and application of visible-light responsive ternary composite photocatalyst
  • Preparation method and application of visible-light responsive ternary composite photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1 NGQDs@g-C 3 N 4 / Bi 2 WO 6 Surface Composite Photocatalyst Preparation

[0029] (1) First weigh 10 g of melamine and calcinate it in a muffle furnace at a temperature of 550 ° C for 4 hours, and finally collect samples to obtain g-C 3 N 4 .

[0030] (2) 0.1653g of Na 2 WO 4 2H 2 O was dissolved in 32 mL of deionized water, followed by the addition of 0.209 g of the above-synthesized g-C 3 N 4 , after ultrasonic dispersion for 30min, add 8mL of glacial acetic acid into the above solution for mixing and stirring.

[0031] (3) Then add 0.4861g of Bi(NO 3 ) 3 ·5H 2 O was added to the above-mentioned stirred solution, and continued to stir for 1 hour to finally obtain a yellow suspension. Transfer the obtained sample to a 100mL reaction kettle, heat it in an oven at 180°C for 12 hours, and obtain a light yellow color after hydrothermal reaction. The suspension was centrifuged with distilled water and ethanol, and the product was washed several times, ...

Embodiment 2

[0033] Example 2 NGQDs@g-C 3 N 4 / Bi 2 WO 6 Characterization of Surface Composite Photocatalysis

[0034] Such as figure 1 As shown, there is g-C in XRD 3 N 4 In addition to the two characteristic peaks of g-C 3 N 4 / Bi 2 WO 6 Bi in the composite photocatalyst 2 WO 6 The characteristic peaks are not due to g-C 3 N 4 changed by the addition of g-C 3 N 4 / Bi 2 WO 6 The crystallinity of the composite photocatalyst is very high. while in g-C 3 N 4 / Bi 2 WO 6 The characteristic peaks of NGQDs were not found in the composite photocatalyst because the amount of NGQDs was relatively small.

[0035] Such as figure 2 As shown in the XPS figure, it can be seen that there are C, N, O, W, and Bi elements.

Embodiment 3

[0036] Example 3 NGQDs@g-C 3 N 4 / Bi 2 WO 6 Visible light catalytic activity experiments of surface composite photocatalysts

[0037] (1) Prepare a tetracycline solution with a concentration of 10 μg / L, and place the prepared solution in a dark place.

[0038] (2) Weigh different contents of NGQDs@g-C 3 N 4 / Bi 2 WO 6 Put 50mg of composite photocatalyst on the surface into the photocatalytic reactor respectively, add 100mL of the target degradation solution prepared in step (1), and stir magnetically for 30 minutes. After the composite photocatalyst is dispersed evenly, turn on the water source and light source, and carry out the photocatalytic degradation experiment .

[0039] (3) Draw the photocatalytic degradation solution in the reactor every 10 minutes, centrifuge and use it for the measurement of ultraviolet-visible absorbance.

[0040] (4) by image 3 a It can be seen that in the prepared nanocomposite photocatalyst, the loading of 60% g-C 3 N 4 / Bi 2 WO 6...

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Abstract

The invention belongs to the technical field of photocatalysis, in particular to a preparation method and application of a visible-light responsive ternary composite photocatalyst. The method comprises the following steps: dissolving NGQDs and g-C3N4 / Bi2WO6 into deionized water, stirring at a room temperature to obtain an NGQDs@g-C3N4 / Bi2WO6 composite nano-material. The introduced NGQDs is used as a collector of dual-function electrons-holes, so that electrons produced by visible-light induced g-C3N4 are transferred to NGQDs, and holes produced by visible-light induced Bi2WO6 are transferred to NGQDs; oxidation-reduction reaction on the electrons-holes is further carried out, so that the separation efficiency of the electrons-holes is improved finally, and the photocatalytic activity is enhanced.

Description

technical field [0001] The present invention relates to a 2 WO 4 2H 2 O, Bi(NO 3 ) 3 ·5H 2 O, citric acid, glacial acetic acid and melamine as raw materials to prepare NGQDs@g-C 3 N 4 / Bi 2 WO 6 The surface composite photocatalyst method is a method with simple preparation process and low cost, and can be used to degrade tetracycline under visible light. Background technique [0002] At present, with the continuous development of human society, the continuous improvement of economic level, and the continuous advancement of scientific and technological level, contemporary resources and ecological environment have become increasingly prominent, posing severe challenges to human beings. Sustainable development has become the path that modern society must choose, and the two major challenges it faces are energy issues and environmental issues. As a renewable energy source, solar energy is rich in resources, cheap, clean, and has no pollution to the environment. basis f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24B01J23/31C02F1/30C02F101/38
CPCC02F1/30B01J23/31B01J27/24C02F2305/10C02F2101/38B01J35/39Y02W10/37
Inventor 刘春波车慧楠
Owner JIANGSU UNIV
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