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A kind of Z-type visible light responsive composite photocatalyst and preparation method thereof

A technology of visible light and recombination light, which is applied in the field of photocatalysis, can solve the problems of wide band gap, low solar energy utilization efficiency, and poor response to visible light, etc., and achieve the effect of reducing recombination rate, benefiting application, and large specific surface area

Active Publication Date: 2020-06-30
北京清云阳光环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Titanium dioxide (TiO 2 ) has excellent performance, but TiO 2 The band gap is wide, and the utilization efficiency of solar energy is relatively low, and its excellent performance can only be exerted under the irradiation of ultraviolet light.
Although researchers have tried to modify it through various methods, none of them can fundamentally solve the problem of its poor response to visible light.

Method used

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  • A kind of Z-type visible light responsive composite photocatalyst and preparation method thereof

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preparation example Construction

[0021] A method for preparing a Z-type visible light-responsive composite photocatalyst provided in an embodiment of the present invention comprises the following steps:

[0022] S1, adding iron salt, zinc salt and cerium salt to an organic solvent to prepare a mixed solution;

[0023] S2, adding polyethylene glycol into the mixed solution, stirring until the solution is clear and transparent, to obtain a reaction solution;

[0024] S3, placing the reaction solution in a combined microwave-ultrasonic device, reflux for 1-2 hours, and then dry;

[0025] S4, calcining the product obtained in step S3 at 300-800° C. for 2-5 hours to obtain CeO 2 -ZnFe 2 o 4 Complex;

[0026] S5, combining graphene oxide with the CeO 2 -ZnFe 2 o 4 The complex is mixed in an organic solvent, placed in a microwave-ultrasonic device, refluxed for 0.5-2 hours, separated to obtain a solid, and then dried to obtain CeO 2 -ZnFe 2 o 4 / GO complex.

[0027] Zinc ferrite is a kind of composite oxi...

Embodiment 1

[0043] A Z-type visible light-responsive composite photocatalyst provided in this embodiment is prepared according to the following steps:

[0044] One, the preparation of graphene oxide (GO):

[0045] Add 60mL of concentrated sulfuric acid into the single-necked flask reactor, then add 10mL of concentrated phosphoric acid, and stir the solution uniformly by magnetic stirring. Put the reactor containing the acid solution into an ice-water bath to cool, and add 350 mg of graphite flakes, and then add 500 mg of chromium trioxide dipyridine. Put the reactor into a microwave-ultrasonic combined device, connect it with a reflux device with condensation, set the ultrasonic power to 300W, first react for 0.5h under the condition of microwave power of 100W, and then react for 2h under the condition of microwave power of 600W The reaction solution was taken out and poured into a 200ml ice-water bath for cooling, and the graphene oxide (GO) was separated by centrifugation.

[0046] 2....

Embodiment 2

[0055] A Z-type visible light-responsive composite photocatalyst provided in this embodiment is prepared according to the following steps:

[0056] One, the preparation of graphene oxide (GO):

[0057] Add 40mL of concentrated sulfuric acid into the single-necked flask reactor, then add 10mL of concentrated phosphoric acid, and stir the solution evenly with magnetic stirring. Put the reactor containing the acid solution into an ice-water bath to cool, and add 350 mg of graphite flakes, and then add 350 mg of chromium trioxide dipyridine. Put the reactor into a microwave-ultrasonic combination device, connect it with a reflux device with condensation, set the ultrasonic power to 300W, and the microwave power to 600W to react for 2.5h, take out the reaction solution and pour it into a 200ml ice-water bath to cool. Graphene oxide (GO) was isolated by centrifugation.

[0058] 2. CeO 2 -ZnFe 2 o 4 Preparation of complex:

[0059] 1) Prepare a mixed solution by adding 0.5 g of...

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Abstract

The invention provides a Z-type visible light responsive composite photocatalyst and a preparation method thereof, and relates to the technical field of photocatalysis. The preparation method is to add iron salt, zinc salt and cerium salt to an organic solvent, then add polyethylene glycol, stir until the solution is clear and transparent, and obtain a reaction liquid. The reaction solution is refluxed in a microwave-ultrasonic combined device for 1 to 2 hours. After drying the reaction solution, it is roasted at 300 to 800°C for 2 to 5 hours to obtain CeO. 2 ‑ZnFe 2 O 4 Complex. Combining graphene oxide with CeO 2 ‑ZnFe 2 O 4 The complex is mixed, refluxed in a microwave-ultrasonic device for 0.5 to 2 hours, and CeO is separated. 2 ‑ZnFe 2 O 4 / GO composite, thereby constructing a Z-type visible light responsive composite photocatalyst, which exhibits good catalytic activity and stability, and the preparation method is simple and fast, the reaction conditions are mild, and the parameters are easy to control.

Description

technical field [0001] The invention relates to the technical field of photocatalysis, and in particular to a Z-type visible light responsive composite photocatalyst and a preparation method thereof. Background technique [0002] The electrons and holes generated by photocatalyst excitation under light play the role of reduction and oxidation respectively. Therefore, photocatalytic technology is considered to be an energy-saving and environmentally friendly environmental treatment technology with broad application prospects. Titanium dioxide (TiO 2 ) has excellent performance, but TiO 2 The band gap is wide, and the utilization efficiency of solar energy is relatively low, and its excellent performance can only be exerted under the irradiation of ultraviolet light. Although researchers have tried to modify it through various methods, none of them can fundamentally solve the problem of its poor response to visible light. Therefore, the development of photocatalytic materi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/83
CPCB01J23/002B01J23/83B01J37/343B01J37/346B01J2523/00B01J35/39B01J2523/3712B01J2523/27B01J2523/842
Inventor 牛玉李福颖王仁章董国文石庆会徐培境陈善辉
Owner 北京清云阳光环保科技有限公司