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Preparation method of MIL-53(Fe)/g-C3N4 nanosheet composite photocatalysis material

A technology of composite photocatalysis and nanosheets, which is applied in the field of photocatalytic materials, can solve the problems of small specific surface area and easy composite, and achieve the effect of simple and easy process, mild conditions and suitable for large-scale production

Active Publication Date: 2016-11-09
EAST CHINA NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But TiO 2 There are still some shortcomings, such as: small specific surface area, high band gap energy (3.2eV), easy recombination of electron-hole pairs, etc.

Method used

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  • Preparation method of MIL-53(Fe)/g-C3N4 nanosheet composite photocatalysis material
  • Preparation method of MIL-53(Fe)/g-C3N4 nanosheet composite photocatalysis material
  • Preparation method of MIL-53(Fe)/g-C3N4 nanosheet composite photocatalysis material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] 1) g-C 3 N 4 Preparation of nanosheets

[0030] Weigh 10 g of urea and place it in a crucible with a lid, wrap the crucible with aluminum foil, place it in a box furnace for heating under a nitrogen atmosphere (introduce nitrogen at a flow rate of 1.5 L / min), and heat up to 550 °C at a heating rate of 5 °C / min. ~600℃, keep it warm for 2h, cool down to room temperature naturally, and get block g-C 3 N 4 ;Weigh 150mg of synthetic block g-C 3 N 4 , add 150mL of water, use an ultrasonic instrument with a power of 300W for 3 hours, then let it stand for 1 hour, use a dropper to carefully remove the top layer of liquid, and centrifuge at 7000 rpm for 10 minutes to obtain g-C 3 N 4 Nanosheet, its morphology and XRD spectrum see figure 2 .

Embodiment 2

[0032] 1) Preparation of MIL(Fe)-53

[0033] First, 2mmol FeCl 3 •6H 2 O and 2 mmol of terephthalic acid were dissolved in 40 mL of N,N-dimethylformamide, stirred magnetically for 60 min, then transferred to a hydrothermal kettle, heated at 150°C for 15 h, and cooled naturally to room temperature at 4000 rpm / min speed, centrifuged for 5min, then washed twice with DMF and methanol respectively, and finally vacuum-dried at 80°C for 12h to obtain the MIL(Fe)-53 (abbreviated as M53). For its morphology and XRD spectrum, see image 3 and Figure 7 .

[0034] 2) Photocatalysis experiment

[0035] Put 80 mg of the prepared M53 photocatalyst into potassium dichromate solution (100 mL) with a concentration of 50 ppm. Catalytic reaction. Get a certain amount of potassium dichromate solution at regular intervals, test the absorption spectrum of the solution with a UV-visible spectrophotometer, and calculate the degradation rate of the potassium dichromate solution by the change in ...

Embodiment 3

[0037] 1) MIL(Fe)-53 / g-C 3 N 4 Preparation of -20

[0038] First, weigh 20 mg of g-C synthesized in Example 1 3 N 4 Nanosheets were dispersed in 40mL of DMF at room temperature, ultrasonicated for 15-30 min, and then added with 2mmol FeCl 3 •6H 2 O and 2 mmol terephthalic acid, magnetically stirred for 60 min, transferred to a hydrothermal kettle, heated at 150°C for 15 h, naturally cooled to room temperature, centrifuged at 4000 rpm / min for 5 min, and then washed twice with DMF and methanol respectively. times, and finally vacuum dried at 80°C for 12h to obtain the MIL(Fe)-53 / g-C 3 N 4 -20 (referred to as M53 / g-C 3 N 4 -20) Composite photocatalytic material, its morphology and XRD spectrum refer to Figure 4 and Figure 7 .

[0039] 2) Photocatalysis experiment

[0040] The prepared M53 / g-C 3 N 4 Put 80mg of -20 composite photocatalytic material into potassium dichromate solution (100 mL) with a concentration of 50ppm. Under the condition of magnetic stirring, a...

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Abstract

The invention discloses a preparation method of an MIL-53(Fe) / g-C3N4 nanosheet composite photocatalysis material, and belongs to the field of preparation of photocatalysis materials. The preparation method comprises the following steps: carrying out a copolymerization reaction on urea used as a precursor at a high temperature to synthesize g-C3N4, carrying out ultrasonic peeling on the g-C3N4 in order to obtain nanosheets, mixing the nanosheets with an MIL-53(Fe) precursor, and carrying out a solvothermal reaction to obtain the MIL-53(Fe) / g-C3N4 nanosheet composite photocatalysis material. The above catalyst has the advantages of high photocatalysis activity, environmental protection, good reusability, realization of high-efficiency degradation of heavy metal Cr (VI) pollutants in water under a visible light condition, and wide application prospect.

Description

technical field [0001] The invention relates to the field of photocatalytic materials, in particular to a MIL-53(Fe) / g-C 3 N 4 A method for preparing a nanosheet composite photocatalytic material. Background technique [0002] With the development of industrial civilization, sewage containing heavy metals has become one of the most important environmental problems faced by human beings. Among them, high-valence chromium (VI) is the most typical heavy metal pollution. When the concentration of Cr (VI) exceeds 0.05mg / L , which is highly toxic and can cause pain and corrosion to human skin. Usually Cr(VI) is released from industries such as electroplating, leather, metal surface finishing, dyeing, textiles, steel manufacturing, paint pigments, fertilization and photography, how to remove Cr(VI) in sewage is currently a human One of the primary tasks of environmental governance. [0003] Photocatalysis is an environmentally friendly technology. It generally uses semiconducto...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22
CPCB01J27/24B01J31/1691B01J31/223B01J2531/0241B01J2531/842B01J35/19B01J35/39
Inventor 侯树金潘丽坤陆婷
Owner EAST CHINA NORMAL UNIV
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