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Preparation method and application of bismuth oxyiodide/titanium-based metal-organic framework composite

A technology of bismuth oxyiodide and composite materials, applied in chemical instruments and methods, organic compound/hydride/coordination complex catalysts, chemical/physical processes, etc., can solve the problems of poor photocatalytic effect and low quantum efficiency, etc. To achieve the effect of reducing the probability of recombination, strong adsorption and enrichment ability, and enhancing the rate of charge transfer

Inactive Publication Date: 2019-01-25
HUBEI UNIV FOR NATITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, BiOI or metal-organic framework materials alone have low quantum efficiency and poor photocatalytic effect due to the easy recombination of photogenerated electron-hole pairs.

Method used

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  • Preparation method and application of bismuth oxyiodide/titanium-based metal-organic framework composite

Examples

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Embodiment 1

[0032] A method for preparing a bismuth oxyiodide / titanium-based metal-organic framework composite material according to this embodiment, the method includes the following steps:

[0033] (1) NH 2 - Preparation of MIL-125(Ti)

[0034]Add 65ml of anhydrous N,N dimethylformamide (DMF) and 15ml of anhydrous methanol (MeOH) to the polytetrafluoroethylene liner (inner liner of the autoclave) respectively to form a mixed solution. After magnetic stirring for 5min, Add 3.81g (21mmol) 2-aminoterephthalic acid (H2ATA) and continue to stir for 20min, then add 4.78m1 tetrabutyl titanate (14mmol), continue to stir for 30min, remove the stirring bar, put the polytetrafluoroethylene liner in In a high-pressure reactor, tighten it, react at 150° C. for 72 hours, cool naturally, and filter to obtain crystals. Transfer the crystals to a beaker, disperse them in 70ml DMF and stir for 1 hour, wash off unreacted 2-aminoterephthalic acid and tetrabutyl titanate, filter and wash once with DMF; th...

Embodiment 2

[0038] The preparation method of the bismuth oxyiodide / titanium-based metal-organic framework composite material of this embodiment is basically the same as that of Example 1, the only difference being that the NH in step (2) 2 - The amount of MIL-125 added is 0.053g; the sample obtained in this example is labeled as BiOI / NM7 or BiOI@NM7, that is, the amount of NH in the obtained photocatalytic material 2 - The content of MIL-125 in the composite sample is 7wt%.

Embodiment 3

[0040] The preparation method of the bismuth oxyiodide / titanium-based metal-organic framework composite material of this embodiment is basically the same as that of Example 1, the only difference being that the NH in step (2) 2 - The amount of MIL-125 added is 0.078g; the sample obtained in this example is labeled as BiOI / NM10 or BiOI@NM10, that is, the amount of NH in the obtained photocatalytic material 2 - The content of MIL-125 in the composite sample is 10wt%.

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Abstract

The invention relates to a preparation method and application of a bismuth oxyiodide / titanium-based metal-organic framework composite and belongs to the technical field of preparation of composites. Firstly, a functionalized NH2-MIL-125(Ti) material is prepared; then the NH2-MIL-125(Ti) sample is put into a potassium iodide aqueous solution in proportion, stirring and ultrasonic treatment are carried out, and thus a solution A is formed; an ethylene glycol solution of bismuth nitrate pentahydrate serves as a solution B; the solution B is dropwise added into the solution A under a stirring condition and stirred evenly, then stirring reaction continues to be carried out in a water bath at 80 DEG C for 1-3 hours; and finally obtained products are filtered, washed and dried, and thus the BiOI / NH2-MIL-125(Ti) composite is obtained. The composite interface of the composite facilitates separation of electron-hole pairs, the transfer rate of charges is increased, and the recombination probability of the electron-hole pairs is reduced, so that current carriers have long service life, and accordingly the composite has excellent photocatalytic performance.

Description

technical field [0001] The invention belongs to the technical field of composite material preparation, and specifically relates to the preparation and application of a photocatalytic material. More specifically, the invention relates to a preparation method and application of a bismuth oxyiodide / titanium-based metal-organic framework composite material. Background technique [0002] Low-concentration, highly toxic, and refractory organic pollutants in the environment are difficult to treat with traditional physical and chemical methods (such as sedimentation, wet oxidation, etc.) and biochemical techniques based on high concentrations and external metering reagents. Studies have shown that the current sewage treatment process is not effective in removing environmental hormones. Biological treatment methods have been proven to be unable to effectively degrade most environmental hormones, and the biological removal part is usually dominated by sludge adsorption, and pollutants ...

Claims

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Application Information

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IPC IPC(8): B01J31/26C02F1/30C02F101/30
CPCC02F1/30B01J31/1691B01J31/2239B01J31/26C02F2101/308B01J2531/46B01J35/39
Inventor 吴德勇吴称意谭海燕
Owner HUBEI UNIV FOR NATITIES
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