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Bismuth tungstate@MIL-100 (Fe) composite material, preparation method and application thereof

A composite material, bismuth tungstate technology, applied in chemical instruments and methods, catalyst activation/preparation, special compound water treatment, etc., can solve the problems of reducing photocatalytic activity, affecting photocatalytic effect, etc. The effect of photocatalytic activity and high removal ability

Inactive Publication Date: 2021-01-22
HUNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, like most monomeric materials, Bi 2 WO 6 The photogenerated electron-hole pairs are easy to recombine, which greatly reduces the photocatalytic activity
In addition, due to its small nanometer size, Bi 2 WO 6 It is easy to agglomerate in water, which further affects the photocatalytic effect

Method used

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  • Bismuth tungstate@MIL-100 (Fe) composite material, preparation method and application thereof
  • Bismuth tungstate@MIL-100 (Fe) composite material, preparation method and application thereof
  • Bismuth tungstate@MIL-100 (Fe) composite material, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Preparation of MIL-100(Fe) by hydrothermal method: Weigh 0.36mmol iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) was dissolved in 36mL deionized water, then added 0.24mmol trimesic acid (C 9 h 6 o 6 ) and 3.24mL hydrofluoric acid (HF, 40wt%), stirred magnetically at room temperature for 1 hour, then transferred the above mixed solution to a 100mL polytetrafluoroethylene-lined stainless steel reaction kettle, and placed it in a blast drying oven at 160 Continuous heating at ℃ for 12h. After the hydrothermal reaction is over, wait for the reaction kettle to cool down naturally, obtain the precipitate in the mixed solution by centrifugation, then pour the precipitate into 150mL water and ethanol in turn, and stir continuously for at least 2 hours in a water bath at 60°C to completely remove impurities , followed by suction filtration to obtain a solid powder product, which was dried in a vacuum oven at 70° C. for 12 hours, and the final product obtained was MIL-100...

Embodiment 2

[0026] This embodiment is basically the same as Embodiment 1, and the special features are:

[0027] (1) This step is the same as in Example 1

[0028] (2) Weigh 90mg cetyltrimethylammonium bromide (C 19 h 42 BrN) was completely dissolved in 80mL of deionized water, and then 165mg of sodium tungstate (Na 2 WO 4 2H 2 O), magnetically stirred at room temperature until the solution was clear. Then get 30mg of MIL-100(Fe) powder obtained in step (1) and add it to the previous solution, ultrasonically disperse it for 30min, then weigh 485mg of bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) added to the above mixture. After stirring at room temperature for 1 h, the above mixture was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel reaction kettle, and placed in a blast drying oven at 120°C for continuous heating for 24 h. After the hydrothermal reaction is over, wait for the reaction kettle to cool naturally, obtain the precipitate in the mixed solution by centr...

Embodiment 3

[0031] This embodiment is basically the same as Embodiment 1, and the special features are:

[0032] (1) This step is the same as in Example 1

[0033] Weigh 50mg cetyltrimethylammonium bromide (C 19 h 42 BrN) was completely dissolved in 80mL of deionized water, and then 165mg of sodium tungstate (Na 2 WO 4 2H 2 O), magnetically stirred at room temperature until the solution was clear. Then get 15mg of MIL-100(Fe) powder obtained in step (1) and add it to the previous solution, ultrasonically disperse it for 30min, then weigh 485mg of bismuth nitrate (Bi(NO 3 ) 3 ·5H 2 O) added to the above mixture. After stirring at room temperature for 1 h, the above mixture was transferred to a 100 mL polytetrafluoroethylene-lined stainless steel reaction kettle, and placed in a blast drying oven at 120°C for continuous heating for 24 h. After the hydrothermal reaction is over, wait for the reaction kettle to cool naturally, obtain the precipitate in the mixed solution by centrifug...

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Abstract

The invention discloses a bismuth tungstate@MIL-100 (Fe) composite material, a preparation method and application thereof. The preparation method specifically comprises the following steps: adding a prepared metal organic framework material MIL-100 (Fe) into a precursor salt solution of bismuth tungstate, and synthesizing the bismuth tungstate@MIL-100 (Fe) composite material in situ by adopting ahydrothermal method. According to the invention, the bismuth tungstate@MIL-100 (Fe) composite material prepared by the invention has a large specific surface area and enhanced visible light absorptioncapacity, and a heterostructure formed between bismuth tungstate and MIL-100 (Fe) can improve the separation efficiency of photo-induced electron hole pairs, promote the transfer of photoelectrons, and significantly improve the photocatalytic activity; the experimental results show that the removal rate of the bismuth tungstate@MIL-100 (Fe) composite material on tetracycline hydrochloride organicmatters in an aqueous solution under sunlight reaches 90% or above; and the preparation process adopting the hydrothermal method has the advantages of simpleness, no need of adjusting the pH value ofthe solution, low energy consumption, low risk and easiness in large-scale production.

Description

technical field [0001] The invention relates to a bismuth tungstate@MIL-100(Fe) composite material and its preparation method and its application in removing tetracycline hydrochloride from water Background technique [0002] Environmental problems brought about by the rapid development of industries such as textile printing and dyeing, paper printing, petrochemical and medical pharmaceuticals have attracted more and more attention. A large number of toxic and harmful organic substances are discharged into the water environment, and ordinary sewage treatment systems cannot remove such pollutants well, and their existence may even affect the normal operation of activated sludge sewage treatment systems. After decades of development, photocatalytic technology has become an efficient method for removing organic pollutants in water. As an important member of the metal-organic framework material family, MIL (Lavoisier framework material) has been extensively studied by scholars,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J31/34B01J35/10B01J37/10C02F1/30C02F101/38C02F101/36C02F101/34
CPCB01J31/1691B01J31/2239B01J31/34B01J37/10C02F1/30B01J2531/842B01J2531/0213C02F2305/10C02F2101/38C02F2101/36C02F2101/34B01J35/61B01J35/39
Inventor 王冬波何衍英符气梓
Owner HUNAN UNIV
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