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Rare-earth-element-doped defective UiO-66 material as well as preparation method and application thereof

A rare earth element, uio-66 technology, applied in chemical instruments and methods, other chemical processes, water/sludge/sewage treatment, etc. question

Inactive Publication Date: 2021-06-25
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chemical precipitation is currently the most commonly used method to deal with heavy metal antimony (Sb), but the problem of secondary pollution is serious; the energy consumption of electric flotation is high, and the excessive energy input limits the sustainable use of this method; The exchange method has many problems in the processing process, such as low selectivity, slow processing process, long time consumption, low efficiency ratio, and large investment in manpower and material resources.

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  • Rare-earth-element-doped defective UiO-66 material as well as preparation method and application thereof
  • Rare-earth-element-doped defective UiO-66 material as well as preparation method and application thereof
  • Rare-earth-element-doped defective UiO-66 material as well as preparation method and application thereof

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preparation example Construction

[0024] The invention provides a method for preparing a defect UiO-66 material doped with rare earth elements, comprising the following steps:

[0025] Mixing zirconium tetrachloride, terephthalic acid, N,N-dimethylformamide and rare earth oxides, and subjecting the resulting mixture to a solvothermal reaction to obtain defect UiO-66 materials doped with rare earth elements;

[0026] The rare earth oxide is Sm 2 o 3 、Eu 2 o 3 、Er 2 o 3 or Tm 2 o 3 ;

[0027] The molar ratio of the zirconium tetrachloride, terephthalic acid and rare earth oxide is 1:1:(0.25-0.5).

[0028] In the present invention, unless otherwise specified, the raw materials used are commercially available products well known in the art.

[0029] In the invention, zirconium tetrachloride, terephthalic acid, N,N-dimethylformamide and rare earth oxide are mixed, and the obtained mixture is subjected to solvothermal reaction to obtain defect UiO-66 material doped with rare earth element.

[0030] In the ...

Embodiment 1

[0044] Preparation of UiO-66-0.3Sm

[0045] Weigh 2mmol of zirconium tetrachloride and dissolve it in 100mL of DMF solvent evenly, add 2mmol of terephthalic acid after ultrasonic stirring for 30min, and continue ultrasonic stirring for 45min to disperse the solution evenly to obtain an intermediate mixture; then add 0.6mmol of samarium oxide to the above In the intermediate mixture (the molar ratio of zirconium tetrachloride, terephthalic acid and samarium oxide is 1:1:0.3), continue ultrasonic stirring for 30 minutes; then transfer to a 200mL reactor and perform solvothermal reaction in an oven at 120°C for 48 hours After cooling to room temperature and centrifuging, the obtained precipitate was ultrasonically washed three times with anhydrous methanol, each time the amount of anhydrous methanol was 100mL; the filtered product was vacuum-dried in an oven at 130°C, ground and sieved.

Embodiment 2

[0047] Preparation of UiO-66-0.3Eu

[0048] Weigh 2mmol of zirconium tetrachloride and dissolve it uniformly in 100mL DMF solvent, add 2mmol of terephthalic acid after ultrasonic stirring for 30min, and continue ultrasonic stirring for 45min to disperse the solution evenly to obtain an intermediate mixture; then add 0.6mmol of europium oxide to the above In the intermediate mixture (the molar ratio of zirconium tetrachloride, terephthalic acid and europium oxide is 1:1:0.3), continue ultrasonic stirring for 30min; then transfer to a 200mL reactor and perform solvothermal reaction in an oven at 120°C for 48h ; After cooling to room temperature, centrifuge, and ultrasonically wash the obtained precipitate with anhydrous methanol three times to remove the remaining substances in the reaction system, each time the amount is 100mL; the filtered product is vacuum-dried in an oven at 130°C, ground and sieved .

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Abstract

The invention provides a rare-earth-element-doped defective UiO-66 material as well as a preparation method and application thereof, and belongs to the technical field of wastewater treatment. The preparation method of the defective UiO-66 material comprises the following steps: mixing zirconium tetrachloride, terephthalic acid, N,N-dimethylformamide and rare earth oxide, and carrying out solvothermal reaction on the obtained mixture to obtain the rare-earth-element-doped defective UiO-66 material. The rare earth oxide is Sm2O3, Eu2O3, Er2O3 or Tm2O3; and the molar ratio of the zirconium tetrachloride to the terephthalic acid to the rare earth oxide is 1:1:(0.25-0.5). The defective UiO-66 material prepared by the preparation method disclosed by the invention has a relatively large adsorption capacity on Sb.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a defect UiO-66 material doped with rare earth elements and a preparation method and application thereof. Background technique [0002] The widespread use of the heavy metal antimony (Sb) and its compounds has led to increasingly serious antimony pollution in the environment. The World Health Organization (WHO) stipulates that the concentration of antimony in drinking water should not exceed 5 μg / L. The current survey shows that the content of heavy metal antimony in some freshwater rivers, lakes and groundwater has exceeded the standard, so it is very important to find an effective method to remove heavy metal antimony in water. [0003] The research status at home and abroad shows that chemical precipitation, electric flotation, ion exchange, solvent extraction and adsorption are all effective means to remove antimony. The chemical precipitation method is current...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F101/20
CPCB01J20/226C02F1/285C02F2101/20
Inventor 罗旭彪丁琳王鹏翔罗赣张庄熊谟鹏邵鹏辉杨利明石慧
Owner NANCHANG HANGKONG UNIVERSITY
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