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Visible light responsive composite photocatalyst, preparation method and applications thereof

A responsive, composite light technology, applied in the field of photocatalysis, can solve the problems of poor photocatalytic activity, low quantum efficiency of photocatalytic system, affecting photocatalytic efficiency, etc., to achieve good photocatalytic performance, high visible light absorption intensity, and recycling. high rate effect

Inactive Publication Date: 2017-07-14
FOSHAN UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although β -Bi 2 o 3 The bandgap width is 2.4 eV, which has a ratio of α -Bi 2 o 3 Stronger visible light absorption, but β -Bi 2 o 3 As a photocatalyst, there are still three problems: (1) β -Bi 2 o 3 In the photocatalytic process, it is easily converted into α -Bi 2 o 3 , and with CO 2 The reaction produces carbonate, resulting in a decrease in photocatalytic activity; (2) β -Bi 2 o 3 The quantum efficiency of the photocatalytic system is low, resulting in poor photocatalytic activity; (3) β -Bi 2 o 3 The conduction band is lower than the H + / H 2 The reduction potential of the photogenerated electrons is very easy to recombine with the photogenerated holes, which affects the photocatalytic efficiency.

Method used

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  • Visible light responsive composite photocatalyst, preparation method and applications thereof
  • Visible light responsive composite photocatalyst, preparation method and applications thereof
  • Visible light responsive composite photocatalyst, preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Preparation of visible light responsive composite photocatalyst:

[0052] (1) First, CuBi with uniform morphology and structure was prepared by hydrothermal method 2 o 4 , that is, 0.04 mole parts of Bi(NO 3 ) 3 ·5H 2 O dissolved in 3 mL concentrated HNO 3 , stirred to dissolve completely, and then added 20 mL of 0.02 molar parts of Cu(NO 3 ) 2 ·3H 2 O, stir to make it evenly mixed, then dropwise add 20 mL of 1.2 mol / L NaOH, and dilute the dropwise mixed solution to 70 mL, continue stirring for 1 h, then transfer the mixed solution to a high-pressure reactor , raised the temperature to 100 °C, and reacted for 24 h. After the reaction kettle was naturally cooled to room temperature, the precipitate obtained from the reaction was repeatedly ultrasonically washed with ultrapure water, and centrifuged at 6000 r / min, and then separated at 60 ℃ in a vacuum drying oven for 12 h, ground and passed through an 80-mesh sieve to obtain CuBi 2 o 4 .

[0053] (2), and then...

Embodiment 2

[0057] The preparation of the visible light-responsive composite photocatalyst was the same as in Example 1.

[0058] The performance test of the visible light-responsive composite photocatalyst applied to the removal of diclofenac in water: 0.2 g of the above-mentioned visible light-responsive composite photocatalyst was added to 1 L of 5 mg / L diclofenac solution, and the dark adsorption reaction was carried out for 30 minutes to reach the adsorption equilibrium. Then, the photocatalytic reaction was performed under 300 W xenon lamp irradiation for 3 h. After the experiment, the solid and liquid were separated by centrifugation, and the residual concentration of diclofenac in the supernatant was determined. It can be seen from the test results that the removal efficiency of diclofenac by the visible light-responsive composite photocatalyst is 80.49%.

Embodiment 3

[0060] The preparation of the visible light-responsive composite photocatalyst was the same as in Example 1, except that the volume of gluconic acid in the gluconic acid solution was 0.6 mL.

[0061] The performance test of the visible light-responsive composite photocatalyst applied to the removal of diclofenac in water: In 1 L of 5 mg / L diclofenac solution, 0.4 g of the above-mentioned visible light-responsive composite photocatalyst was added, and the dark adsorption reaction was carried out for 30 minutes to reach the adsorption equilibrium. Then, the photocatalytic reaction was performed under 300 W xenon lamp irradiation for 3 h. After the experiment, the solid and liquid were separated by centrifugation, and the residual concentration of diclofenac in the supernatant was determined. It can be seen from the test results that the removal efficiency of diclofenac by the visible light-responsive composite photocatalyst is 78.62%.

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Abstract

The invention relates to a visible light responsive composite photocatalyst, a preparation method and applications thereof, wherein the visible light responsive composite photocatalyst is CuBi2O4 / beta-Bi2O3, the CuBi2O4 in the visible light responsive composite photocatalyst is hollow microspheres, the beta-Bi2O3 is irregular nanoparticles, and the CuBi2O4 closely contacts the beta-Bi2O3. According to the present invention, the visible light responsive composite photocatalyst has strong absorption in the whole visible light spectrum range, and has good photocatalytic performance and high recycling rate compared to the pure beta-Bi2O3; and after organic wastewater containing difficultly degraded diclofenac is treated with 0.4 g of CuBi2O4 / beta-Bi2O3 (1:2.25, wt%) and visible light irradiation is performed for 3 h, the removal rate of 1 L of a 5 mg / L diclofenac solution is 89.02%, and the removal rate of the diclofenac solution is 78.43% with the CuBi2O4 / beta-Bi2O3 being repeatedly used 7 times.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, in particular to a visible light responsive composite photocatalyst and its preparation method and application. Background technique [0002] In recent years, the continuous development of the economy and society and the continuous deepening of the industrialization process have led to the discharge of a large number of emerging organic pollutants in wastewater, but the current municipal sewage treatment system is difficult to completely remove them, resulting in these emerging organic pollutants in surface water, groundwater , and even in drinking water systems. And these emerging organic pollutants, such as diclofenac, etc., even at trace concentrations, will be seriously harmed if humans, animals and plants are exposed to them for a long time. Therefore, the removal of emerging organic pollutants in wastewater is still the focus and difficulty in the field of environmental protection. ...

Claims

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Application Information

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IPC IPC(8): B01J23/843B01J23/18B01J35/02C02F1/30C02F101/30C02F103/34
CPCC02F1/30B01J23/18B01J23/8437C02F2305/10C02F2103/343C02F2101/30B01J35/51B01J35/39B01J35/40Y02W10/37
Inventor 陈晓娟徐颂王海龙陈忻陈美纶
Owner FOSHAN UNIVERSITY
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