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A cu2o/au‑fe2o3 photocatalyst and its preparation method and application

A photocatalyst, au-fe2o3 technology, applied in the field of photocatalytic materials and visible light catalytic materials, can solve the problems of reduced photocatalytic activity and small light absorption coefficient, and achieves the promotion of hole generation, improved catalytic performance, and promotion of electron transfer. Effect

Active Publication Date: 2018-03-09
浙江海宁经编产业园区开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But Fe 2 o 3 In the process of photocatalysis, photogenerated electrons and holes recombine rapidly, and the light absorption coefficient is small, resulting in a decrease in photocatalytic activity.

Method used

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  • A cu2o/au‑fe2o3 photocatalyst and its preparation method and application
  • A cu2o/au‑fe2o3 photocatalyst and its preparation method and application
  • A cu2o/au‑fe2o3 photocatalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Fe 2 o 3 Preparation of photocatalyst: Fe(NO 3 ) 3 9H 2 O is ground and laid flat in a crucible, heated to 500°C at 2°C / min, and calcined at constant temperature for 3h.

[0051] (2) Au-Fe 2 o 3 The preparation of photocatalyst, the steps are as follows:

[0052] 1g Fe 2 o 3 Add it into the reactor, stir evenly, add 0.2mL of chloroauric acid, continue to pass nitrogen, irradiate with visible light for 3h, centrifuge, dry at 100°C, and grind to obtain Au-Fe 2 o 3 .

[0053] (3) Cu 2 O / Fe 2 o 3 The preparation of photocatalyst, the steps are as follows:

[0054] 1g Fe 2 o 3 and 50mg Cu 2 O was added to water, ultrasonically dispersed for 30 minutes, hydrothermally reacted for 18 hours, kept at a constant temperature of 160°C, centrifuged, dried at 60°C, and ground to obtain Cu 2 O / Fe 2 o 3 .

[0055] (4) Cu 2 O / Au-Fe 2 o 3 The preparation of photocatalyst, the steps are as follows:

[0056] (1) 6g Fe(NO 3 ) 3 9H 2 O is ground and laid flat ...

Embodiment 2

[0060] The photocatalyst Cu prepared by embodiment 1 2 O / Au-Fe 2 o 3 、Cu 2 O / Fe 2 o 3 , Fe 2 o 3 , Au-Fe 2 o 3 Perform UV-visible diffuse reflectance scanning and infrared spectral scanning to obtain UV-vis-DRS comparison figure 1 and infrared spectroscopy figure 2 .

[0061] Such as figure 1 , Fe 2 o 3 It has strong absorption in the visible light range, and when the wavelength reaches 700nm, it still has strong absorption. After loading Au in the full wavelength range, Au-Fe 2 o 3 The absorption of light is enhanced. Cu 2 O / Fe 2 o 3 In the full wavelength range, the absorption of light, the absorption of light is also enhanced. Cu 2 O / Au-Fe 2 o 3 relative to Fe 2 o 3 , the absorption of light with a wavelength less than 600nm increases significantly, and the absorption of light with a wavelength greater than 700nm increases significantly. This shows that Cu 2 O / Au-Fe 2 o 3 Good response to light, especially visible light.

[0062] Such as f...

Embodiment 3

[0064] Into the reactor, adding volume is 50mL, concentration 10mg / L contains phenol containing waste water, adds the Cu of 50mg 2 O / Au-Fe 2 o 3 Visible light catalyst, no need to adjust the pH, keep stirring, stir in the dark for 30 minutes to adsorption equilibrium, turn on the visible light source, and react for 5 hours.

[0065] Change photocatalyst to be the photocatalyst Fe that embodiment 1 prepares 2 o 3 、Au-Fe 2 o 3 、 Cu 2 O / Fe 2 o 3 Carry out the comparison of degrading phenol effect, the result is as follows image 3 and Table 1.

[0066] Such as image 3 , under the same conditions, modified prepared Cu 2 O / Au-Fe 2 o 3 、Cu 2 O / Fe 2 o 3 , Au-Fe 2 o 3 relative to Fe 2 o 3 , the degradation effect of phenol was improved to varying degrees. After 5 hours, Fe 2 o 3 The oxidation rate of phenol reaches 32.85%. Cu 2 O / Au-Fe 2 o 3 The oxidation rate of phenol reaches 87.07%, which is about Fe 2 o 3 2.65 times. As in Table 1, the degradation ra...

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Abstract

The invention discloses a Cu2O / Au-Fe2O3 photocatalyst and its preparation method and application. The Au loading in the Cu2O / Au-Fe2O3 photocatalyst is 0.5-5wt%, and the Cu2O loading is 2.5-20wt%. The preparation method comprises the following steps: (1) uniformly mixing Fe2O3 powder and chloroauric acid solution, then irradiating with visible light in an oxygen-free environment, centrifuging, drying and grinding after the reaction to obtain Au / Fe2O3; (2) Disperse Au / Fe2O3 and Cu2O in water in proportion, then carry out hydrothermal reaction, centrifuge, dry and grind after the reaction. The preparation method of the photocatalyst of the invention is simple, the separation effect of photogenerated electrons and holes is good, the degree of response to visible light is improved, and the treatment of phenol-containing wastewater has good effect and no secondary pollution.

Description

technical field [0001] The present invention relates to the technical field of photocatalytic materials, especially the technical field of visible light catalytic materials, in particular to a Cu 2 O / Au-Fe 2 o 3 Preparation method of photocatalyst and its application. Background technique [0002] Photocatalytic materials have attracted much attention in recent years because they can be used for photocatalytic degradation of organic pollutants, photolysis of water to produce oxygen and hydrogen, etc. Extensively studied TiO 2 , with a wide band gap, it can only absorb ultraviolet light which accounts for less than 5% of solar energy, and the utilization rate of solar energy is very low. Therefore, the development of novel narrow-bandgap photocatalytic materials has attracted extensive attention in the field of photocatalysis. [0003] Fe 2 o 3 As a narrow bandgap semiconductor material, the bandgap energy is 2.1-2.2eV, and the maximum absorption wavelength is 560nm. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/89C02F1/30C02F1/72C02F101/34
CPCY02W10/37
Inventor 王齐张晨露石晓东刘恩秦胡含蕾周甜甜
Owner 浙江海宁经编产业园区开发有限公司