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Composite photocatalyst as well as preparation method and application thereof

A catalyst and composite light technology, applied in the field of photocatalysis, can solve the problems of narrow spectral absorption range and low utilization rate of sunlight, and achieve the effects of simple steps, improved spectral absorption range, and improved utilization rate

Active Publication Date: 2021-07-09
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a composite photocatalyst, its preparation method and application, in order to solve the technical problems in the prior art that the photocatalyst spectrum absorption range is narrow and the utilization rate of sunlight is not high

Method used

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  • Composite photocatalyst as well as preparation method and application thereof
  • Composite photocatalyst as well as preparation method and application thereof
  • Composite photocatalyst as well as preparation method and application thereof

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preparation example Construction

[0032] The embodiment of the present invention provides a kind of preparation method of composite photocatalyst, comprises the following steps:

[0033] S101, adding a silicon dioxide source into the MXene solution for mixing and stirring to obtain a first reaction solution;

[0034] S102, adding the metal salt into the first reaction solution for mixing and stirring to obtain a second reaction solution;

[0035] S103, filtering, washing and drying the second reaction solution in sequence to obtain a composite photocatalyst.

[0036] The preparation method of this embodiment has the advantages of simple process, low cost, high yield, environmental friendliness and high sunlight utilization efficiency, and has great potential application value in organic sewage treatment.

[0037] In step S101, the two-dimensional material MXene is added to the solvent, and the MXene solution is prepared, and then the silica source is added to the prepared MXene solution, mixed and stirred, an...

Embodiment 1

[0046] This embodiment provides a method for preparing a composite photocatalyst, which is prepared through the following steps:

[0047]Step 1, 10 mL of MXene solution with a concentration of 10 mg / mL and 0.4 g of fumed silica were mixed and stirred for 1 hour to obtain a pure black solution, which was the first reaction solution;

[0048] Step 2, weigh 0.25g of metal salt Fe(NO 3 ) 2 ·6H 2 O was added to the first reaction solution and mixed and stirred for 1h to obtain the second reaction solution;

[0049] Step 3, the reacted product is filtered, washed and dried in turn to obtain the composite photocatalyst Fe-MXene / SiO 2 .

[0050] Composite photocatalyst Fe-MXene / SiO obtained in step 3 of this embodiment 2 The X-ray diffraction (XRD) results see figure 1 Shown; Present embodiment step 3 gained composite photocatalyst Fe-MXene / SiO 2 The UV-vis DRS results see image 3 shown.

Embodiment 2

[0052] This embodiment provides a method for preparing a composite photocatalyst, which is prepared through the following steps:

[0053] Step 1, 10 mL of MXene solution with a concentration of 10 mg / mL and 0.4 g of fumed silica were mixed and stirred for 1 hour to obtain a pure black solution, which was the first reaction solution;

[0054] Step 2, weigh 0.25g of metal salt Co(NO 3 ) 2 ·6H 2 O was added to the first reaction solution and mixed and stirred for 1h to obtain the second reaction solution;

[0055] Step 3, the reacted product is filtered, washed and dried in sequence to obtain the composite photocatalyst Co-MXene / SiO 2 .

[0056] Composite photocatalyst Co-MXene / SiO obtained in step 3 of this embodiment 2 The X-ray diffraction (XRD) results see figure 2 Shown; The composite photocatalyst Co-MXene / SiO of present embodiment step 3 gained 2 The UV-vis DRS results see image 3 shown.

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Abstract

The invention relates to the technical field of photocatalysis, in particular to a composite photocatalyst as well as a preparation method and application thereof. The composite photocatalyst comprises a matrix and a photocatalytic material layer loaded on the surface of the matrix, wherein the matrix comprises silicon dioxide, and the photocatalytic material layer comprises MXene and metal ions connected to the surface of the MXene; through the mode, compounding of photoelectrons and holes can be effectively prevented by utilizing compounding of metal and MXene, and meanwhile, hydrogel is effectively prevented from being formed when the metal and MXene are compounded by utilizing the substrate containing silicon dioxide as a carrier. The composite photocatalyst disclosed by the invention has relatively high light absorption efficiency in both an ultraviolet light region and a visible light region, so that the spectral absorption range is widened, and the utilization rate of sunlight can be effectively improved; the preparation method of the composite photocatalyst is simple in step and beneficial to large-scale synthesis of materials.

Description

【Technical field】 [0001] The invention relates to the technical field of photocatalysis, in particular to a composite photocatalyst, its preparation method and application. 【Background technique】 [0002] Semiconductor photocatalysts have been extensively studied for their cheap, non-toxic, energy-saving and efficient photocatalytic degradation of organic pollutants. However, due to the narrow band gap of traditional semiconductor photocatalysts, they can only absorb ultraviolet light and have low utilization efficiency of solar energy, which greatly limits their application in environmental purification. At present, researchers are beginning to pay attention to new photocatalytic materials to expand the spectral absorption range of materials to facilitate their practical application in environmental purification. [0003] In the prior art, the synthesis methods of new photocatalytic materials mainly focus on the hydrothermal method, emulsion method, sol-gel method, etc., w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/24C02F1/30C02F101/30
CPCB01J27/24C02F1/30C02F2101/30C02F2305/10B01J35/39Y02W10/37
Inventor 张昌泉陈刚吉飞慎义勇彭娟米永红
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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