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Preparation and application of bismuth titanate-coated NH2-MIL-125 photocatalyst

A NH2-MIL-125, photocatalyst technology, applied in the direction of physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc., can solve low light response, low conductivity, Hinder the application and other problems, to achieve the effect of inhibiting recombination and improving separation efficiency

Pending Publication Date: 2022-07-12
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Similar to most single-component photocatalysts, Ti-MOFs have the disadvantages of low photoresponse and fast electron-hole recombination rate
In addition, the low conductivity of MOFs also hinders their application in the field of photocatalysis.

Method used

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  • Preparation and application of bismuth titanate-coated NH2-MIL-125 photocatalyst
  • Preparation and application of bismuth titanate-coated NH2-MIL-125 photocatalyst
  • Preparation and application of bismuth titanate-coated NH2-MIL-125 photocatalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] NH 2 -The preparation method of MIL-125 includes the following steps:

[0031](1) 2-Aminoterephthalic acid (2.86 g, 15.8 mmol) was added to a mixed solution of 10 mL of anhydrous methanol and 40 mL of anhydrous N,N-dimethylformamide, and stirred at room temperature until 2 - The aminoterephthalic acid dissolves completely. Next, titanium isopropoxide (2.86 mL, 9.7 mmol) was added to the above mixed solution, then transferred to a 100 mL polytetrafluoroethylene-lined autoclave, and heated at 110° C. for 72 h. Let stand to cool to room temperature;

[0032] (2) the solid obtained by centrifugation in (1) is immersed in DMF and anhydrous methanol successively and soaked twice and centrifugally washed;

[0033] (3) Vacuum-dry the solid obtained in (2) at 100° C. for 12 h to obtain NH 2 -MIL-125.

[0034] like figure 1 shown. from figure 1 The XRD pattern can be seen with the predecessors made of NH 2 - The XRD patterns of MIL-125 are consistent, indicating that our...

Embodiment 2

[0039] Bismuth Titanate@NH 2 -The preparation method of MIL-125 (1:10) material includes the following steps:

[0040] (1) Take 300mg of NH 2 -MIL-125 is poured into a clean beaker, followed by 50mL of HNO 3 (1 mmol / L) aqueous solution, ultrasonically dissolved, then added 30 mg of bismuth nitrate pentahydrate, ultrasonicated for 15 min to dissolve, and then the mixed solution was stirred at room temperature for 7 h;

[0041] (2) the solid obtained by centrifugation in (1) is centrifuged and washed three times with deionized water and absolute ethanol alcohol respectively;

[0042] (3) The solid obtained in (2) was vacuum-dried at 80 °C for 12 h to obtain bismuth titanate@NH 2 -MIL-125 (1:10).

Embodiment 3

[0044] Bismuth Titanate@NH 2 -The preparation method of MIL-125 (4:10) material includes the following steps:

[0045] (1) Take 300mg of NH 2 -MIL-125 is poured into a clean beaker, followed by 50mL of HNO 3 (1mmol / L) aqueous solution, ultrasonically dissolved, then added 120mg bismuth nitrate pentahydrate, ultrasonicated for 15min to dissolve, and then the mixed solution was stirred and reacted at room temperature for 7h;

[0046] (2) the solid obtained by centrifugation in (1) is centrifuged and washed three times with deionized water and absolute ethanol alcohol respectively;

[0047] (3) The solid obtained in (2) was vacuum-dried at 80 °C for 12 h to obtain bismuth titanate@NH 2 -MIL-125 (4:10).

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Abstract

On the basis of previous research work accumulation, an MOFs photocatalyst with a titanium-based metal cluster as a central node and an amino-containing photosensitive matrix as a ligand is designed, a novel efficient bismuth titanate-coated NH2-MIL-125 composite catalytic catalyst is prepared by using an in-situ etching regeneration strategy, a novel stable, green and efficient photocatalytic NO elimination way is developed, and the photocatalytic NO elimination effect is improved. The basic relationship between the structure and the performance is deeply studied, and diversified MOFs photocatalyst molecular libraries are constructed. Meanwhile, on the basis of reasonable molecular structure design, basic laws between in-situ etching of bismuth nitrate pentahydrate with different contents and the structure and catalytic performance of the MOFs material are deeply explored, and the application prospect of the MOFs material in the heterogeneous catalysis field of visible light catalysis NO elimination and the like is developed. By adjusting the mass of bismuth nitrate pentahydrate, it is found that when the mass ratio of bismuth nitrate pentahydrate to NH2-MIL-125 is 4: 10, the in-situ etching effect is the best, and the NO elimination effect is the best.

Description

technical field [0001] The invention relates to the technical field of photocatalytic NO elimination, in particular to a bismuth titanate@NH 2 - Synthesis and application of MIL-125 photocatalyst. Background technique [0002] In recent years, environmental pollution has become increasingly serious, among which air pollution, such as nitrogen oxides (NO x ), sulfur dioxide (SO 2 ) pollution is of concern. Nitrogen oxides (NO x ) emissions are mainly agricultural activities, deforestation, industrialization, energy production, transportation and other human activities through the burning of nitrogenous sources during the combustion of some toxic gases, causing serious environmental disasters, including acid rain, smog, particulate matter release and the greenhouse effect, etc. In addition, humans or animals with NO x of direct exposure can cause a variety of toxicological reactions, depending on the duration of exposure and NO x concentration. Therefore, research NO ...

Claims

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Application Information

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IPC IPC(8): B01J31/22B01D53/86B01D53/56
CPCB01J31/2243B01D53/8628B01J2531/46B01J35/39Y02W10/37
Inventor 徐永港
Owner CHONGQING TECH & BUSINESS UNIV
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