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Method for efficiently and quickly removing As(III) or As(V) based on magnetic core-shell bimetal MOF

A bimetallic and magnetic technology, applied in alkali metal compounds, chemical instruments and methods, alkali metal oxides/hydroxides, etc., can solve problems such as pollution, and achieve the effects of overcoming the difficulty of recycling, strong feasibility, and simple operation

Active Publication Date: 2021-07-02
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In order to solve the situation of inorganic arsenic pollution in water bodies, the technical problem to be solved by the present invention is to provide a method that can not only convert As(III) into As(V) in combination with magnetic core-shell bimetallic MOF, but also convert both Both are removed from the water body. Therefore, the present invention proposes for the first time the method of using potassium persulfate to assist magnetic core-shell bimetallic MOF to remove As(III, V) efficiently and quickly, which is of great significance to the rapid and efficient removal of inorganic arsenic. The method can effectively improve the removal effect of As(III) and As(V), and the operation process is simple and the processing time is short

Method used

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  • Method for efficiently and quickly removing As(III) or As(V) based on magnetic core-shell bimetal MOF
  • Method for efficiently and quickly removing As(III) or As(V) based on magnetic core-shell bimetal MOF
  • Method for efficiently and quickly removing As(III) or As(V) based on magnetic core-shell bimetal MOF

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1 Preparation of magnetic core-shell bimetallic MOF material

[0030] Add 0.05 g of Fe3O4 nanoparticles into a beaker containing 2 g of polyvinylpyrrolidone and 30 mL of methanol. After sonicating for 30 minutes, 0.98 g of 2-methylimidazole was added to the mixture, which was then sonicated for another 5 minutes. At the same time, 0.7417 g of zinc nitrate hexahydrate and 0.1455 g of cobalt nitrate hexahydrate were weighed and dissolved in 30 mL of methanol. After mixing the two solutions above, ultrasonically for 5 minutes, transfer to an autoclave, heat at 120°C for 4 hours, wash the resulting solid with methanol three times, and dry it in a vacuum oven at 60°C for 12 hours to obtain a magnetic core-shell Bimetallic MOF materials.

Embodiment 2

[0031] Example 2 Preparation of magnetic core-shell bimetallic MOF-2 material

[0032] Add 0.05 g of Fe3O4 nanoparticles into a beaker containing 2 g of polyvinylpyrrolidone and 30 mL of methanol. After sonicating for 30 minutes, 0.98 g of 2-methylimidazole was added to the mixture, which was then sonicated for another 5 minutes. At the same time, 0.446 g of zinc nitrate hexahydrate and 0.4365 g of cobalt nitrate hexahydrate were weighed and dissolved in 30 mL of methanol. After mixing the two solutions above, ultrasonically for 5 minutes, transfer to an autoclave, heat at 120°C for 4 hours, wash the resulting solid with methanol three times, and dry it in a vacuum oven at 60°C for 12 hours to obtain a magnetic core-shell Bimetallic MOF-2 materials.

Embodiment 3

[0033] Example 3 Preparation of magnetic core-shell bimetallic MOF-3 material

[0034] Add 0.05 g of Fe3O4 nanoparticles into a beaker containing 2 g of polyvinylpyrrolidone and 30 mL of methanol. After sonicating for 30 minutes, 0.98 g of 2-methylimidazole was added to the mixture, which was then sonicated for another 5 minutes. At the same time, 0.801 g of zinc nitrate hexahydrate and 0.087 g of cobalt nitrate hexahydrate were weighed and dissolved in 30 mL of methanol. After mixing the two solutions above, ultrasonically for 5 minutes, transfer to an autoclave, heat at 120°C for 4 hours, wash the resulting solid with methanol three times, and dry it in a vacuum oven at 60°C for 12 hours to obtain a magnetic core-shell Bimetallic MOF-3 materials.

[0035] Depend on figure 1 It can be seen that the magnetic core-shell bimetallic MOF material prepared in Example 1 has both Fe 3 o 4 and the characteristic peaks of bimetallic MOF, indicating that the material is indeed Fe ...

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Abstract

The invention relates to a method for efficiently and quickly removing As(III) or As(V) based on a magnetic core-shell bimetal MOF, which comprises the following steps of adding a magnetic core-shell bimetal MOF material and a potassium hydrogen persulfate solution into a sample containing As(III) or As(V), and keeping constant-temperature oscillation in a water bath to complete the removal reaction of As(III) or As(V). The magnetic core-shell bimetal MOF prepared by the method provided by the invention has a certain removal effect on As(III) and As(V), and then potassium hydrogen persulfate is added to cooperate with the magnetic core-shell bimetal MOF, so that the aperture of the magnetic core-shell bimetal MOF can be remarkably increased, and converted As(V) can be more easily adsorbed and removed, the arsenic concentration of an inorganic arsenic polluted water source can be reduced within a short time until the arsenic concentration meets the drinking water standard (10 mug / L). In addition, the magnetic core-shell bimetal MOF can be rapidly separated from a water body through a magnet, and the problem that powder materials are difficult to recycle is solved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and is suitable for efficient and rapid removal of inorganic arsenic in wastewater, and in particular relates to a method for efficient and rapid removal of As(III) or As(V) based on magnetic core-shell bimetallic MOF. Background technique [0002] Inorganic arsenic (As) is one of the most common heavy metal pollutants, mainly originating from anthropogenic activities such as smelting, mining, application of pesticides and fertilizers, and burning of fossil fuels. Studies have confirmed that overexposure to As can lead to nervous system diseases, organ damage, anemia, etc. At present, arsenic has been listed as one of the important controlled pollutants. Therefore, it is an urgent and urgent problem to find a technology and method that can quickly remove inorganic arsenic from polluted water. [0003] At present, the common removal methods of As(III, V) in water include electrocoagulati...

Claims

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Application Information

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IPC IPC(8): C02F1/72C02F1/48C02F1/28B01J20/22B01J20/28B01J20/30B01J31/16B01J35/02C08G83/00C02F101/10
CPCC02F1/725C02F1/285C02F1/488B01J20/226B01J20/28009B01J20/28014B01J31/1691C08G83/008C02F2101/103B01J35/33B01J35/00B01J35/30
Inventor 方颖李海普钱宝玉
Owner CENT SOUTH UNIV
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