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Iron-based organic framework composite material, preparation method and application thereof

A technology of organic framework and composite materials, applied in organic compound/hydride/coordination complex catalysts, chemical instruments and methods, water treatment of special compounds, etc., can solve the limitations of photocatalytic performance, photogenerated electrons and hole recombination rate High, photocatalytic degradation activity and other issues, to achieve the effect of reducing the recombination rate of photogenerated electrons and holes, promoting charge transfer, and inhibiting recombination

Pending Publication Date: 2021-11-19
CHINA UNIV OF GEOSCIENCES (WUHAN)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] MIL-53(Fe) and g-C 3 N 4 Both are photocatalysts that can respond under visible light and have great potential for photocatalytic applications. At the same time, MIL-53(Fe) as an iron-based MOF can be used as a transition metal heterogeneous catalyst to activate persulfate to generate active oxygen species for degradation. Organic pollutants, but there are still some problems. MIL-53 (Fe) has a band gap of about 2.5eV. Due to its narrow light absorption range, its photocatalytic degradation activity is affected to a certain extent; g-C 3 N 4 It has good visible light response performance, but the recombination rate of photogenerated electrons and holes is high, and the photocatalytic performance is limited; the efficiency of iron-based MOFs system to degrade organic pollutants still needs to be improved. Mechanisms for Concentration of Organic Pollutants to be Developed

Method used

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  • Iron-based organic framework composite material, preparation method and application thereof
  • Iron-based organic framework composite material, preparation method and application thereof
  • Iron-based organic framework composite material, preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] 1.1 preparation

[0031] The iron-based organic skeleton composite prepared by the present invention has visible light response, has a heterojunction structure, and the optical electron-hole pair separation efficiency is high, and the specific implementation steps are as follows:

[0032] 3.00 g of melamine is loaded into a 50 ml ceramic crucible, adding 550 ° C in a muffle to heat 3 h (at 5 ° C · min -1 Temperature temperature), after natural cooling, take out with agate mortar to get G-C 3 N 4 . Preparation of solvent heat method, weighing 1.5000GFECL 3 · 6h 2 O and 0.9219G (with FeCL 3 · 6h 2 O substance ratio is 1) h 2 BDC, and 0.1459g (FECL 3 · 6h 2 O The ratio of the amount of its substance is 3.5) G-C 3 N 4 Decoluble in 30 ml of DMF, stirred for 30 min, using an ultrasonic cell crusher to transfer 100 ml of polytetrafluoroethylene liner stainless steel reactor, add 150 ° C in a muffle 12h (at 5 ° C · min. -1 After cooling, naturally cooled to room temperature, 8000r ...

Embodiment 2

[0057] Material composite molar ratio to MIL-53 (Fe) / G-C 3 N 4 / PMS / VIS Degradation of RHB

[0058] Modify the FeCl in Example 1 3 · 6h 2 O and G-C 3 N 4 The ratio of the molar, the other operation is the same as in Example 1.

[0059] The catalytic material of different composite ratios is different from the RHB removal effect, such as Figure 8 The MIL-53 (Fe) / G-C shown in different composite ratios 3 N 4 The removal effect of RHB is: with G-C 3 N 4 Increase in content, the removal rate of RHB presets the trend of reducing, MIL-53 (Fe) / G-C 3 N 4 When the compound ratio X of the catalytic material is less than 3.5, the removal rate of RHB increases and the degradation rate is significantly increased, which is due to G-C 3 N 4 The introduction enables MIL-53 (Fe) absorption wavelength range to redirement, improves the response performance of visible light, and the heterojunction formed between the two can reduce G-C. 3 N 4 Light electron and hole composite; with G-C 3 N 4 ...

Embodiment 3

[0061] Test MIL-53 (Fe), G-C at 200-800 nm wavelength range 3 N 4 , Three composite ratios MIL-53 (Fe) / G-C 3 N 4 Ultraviolet - visible light diffuse reflection spectroscopy (UV-VIS DRS) gets light suction value, such as Figure 9 Analysis of the advantages of composites in light absorption performance and band gap. According to the TAUC diagram according to the formula (3.1), wherein when the material is a direct transition semiconductor, n = 2, and n = 2 is used for the indirect transition semiconductor.

[0062] (αHV) n = A (HV-E g ) Formula (3.1)

[0063]

[0064] Therefore, MIL-53 (Fe) and MIL-53 (Fe) / G-C 3 N 4 Composite N value selection 1 / 2, g-c 3 N 4 For n = 2, (αHV) n For the longitudinal axis, HV is the horizontal axis, such as Figure 10 As shown, the banned band width e obtained by each material is calculated. g And maximum absorption with edge λ max (Formula 3.2). MIL-53 (Fe), G-C 3 N 4 , MIL-53 (Fe) / G-C 3 N 4 (3.5), MIL-53 (Fe) / G-C 3 N 4 (3), MIL-53 (Fe) / G-C...

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Abstract

The invention discloses an iron-based organic framework composite material, a preparation method and application thereof. The preparation method comprises the following steps: dissolvingg-C3N4, FeCl3.6H2O and H2BDC in DMF together to form a mixed solution, dispersing the mixed solution by using ultrasonic waves, carrying out heating reaction on the mixed solution, cooling, washing, drying, and grinding to obtain MIL-53(Fe) / g-C3N4, wherein the molar ratio of g-C3N4 to FeCl3.6H2O to H2BDC is 3:1:1-4:1:1. According to the invention, a heterojunction structure is formed to promote conduction band transition electrons to carry out charge transfer between interfaces, so that compounding of photo-induced electron-hole pairs is inhibited, and the forbidden band width of the material is reduced to widen the response range of visible light; and visible light top illumination is carried out in a degradation experiment process while an oxidizing agent is added, so that the high-efficiency oxidative degradation performance is realized on the dye wastewater.

Description

Technical field [0001] The present invention relates to the field of sewage treatment, and more particularly to an iron-based organic skeleton composite material and a preparation method thereof. Background technique [0002] MIL-53 (Fe) and G-C 3 N 4 Both of which can be in a visible light, has a large photocatalytic application potential, while MIL-53 (Fe) can activate a sulfate as a transition metal non-homogeneous catalyst to activate an active oxygen species degradation. Organic pollutants, but still have some problems, MIL-53 (Fe) is forbidden to have a width of about 2.5 eV, due to its narrower light absorption range, the photocatalytic degradation activity of itself is affected; G-C 3 N 4 Has good visible light response performance, but its photoelectronics and holes have high composite composites, and photocatalytic performance is limited; the efficiency of the iron-based MOFS system degrades the efficiency of organic contaminants remains, one can be highly efficient deg...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22C02F1/72C02F1/30C02F101/30C02F101/34C02F101/36C02F101/38
CPCB01J31/223C02F1/722C02F1/725C02F1/30B01J31/1691C02F2101/308C02F2305/10C02F2101/36C02F2101/38C02F2101/34B01J2531/842
Inventor 鲍建国杨佳蔚徐田田何舟熊鹏飞
Owner CHINA UNIV OF GEOSCIENCES (WUHAN)
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