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MnO2-doped composite magnetic nanometer adsorbent, its preparation method and its application

A manganese dioxide and adsorbent technology, which is applied in chemical instruments and methods, alkali metal compounds, adsorption water/sewage treatment, etc., can solve the problems of limited application and popularization of arsenic removal materials, poor removal of trivalent arsenic, and small arsenic adsorption capacity and other problems, to achieve excellent water purification performance, good removal effect, fast adsorption effect

Active Publication Date: 2012-10-17
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, the methods used to remove arsenic mainly include coagulation, precipitation, adsorption, ion exchange, biodegradation, reverse osmosis and electrodialysis, etc. Most of the adsorption materials have a good removal effect on pentavalent arsenic (As(Ⅴ)). , but the removal effect on trivalent arsenic (As(Ⅲ)) is poor
Studies have shown that the toxicity of As(Ⅲ) is more than 60 times that of As(Ⅴ), and the removal of As(Ⅲ) is much more difficult than As(Ⅴ)
Among the currently commonly used arsenic removal materials, low-cost materials usually have a small adsorption capacity for arsenic, while materials with higher adsorption capacity are often too expensive, which limits the application and promotion of arsenic removal materials.
Nanomaterials have attracted widespread attention because of their large specific surface area and high adsorption capacity, but when nanomaterials are applied to water treatment, separation becomes a difficult problem

Method used

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  • MnO2-doped composite magnetic nanometer adsorbent, its preparation method and its application
  • MnO2-doped composite magnetic nanometer adsorbent, its preparation method and its application
  • MnO2-doped composite magnetic nanometer adsorbent, its preparation method and its application

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Experimental program
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Effect test

Embodiment 1

[0037] Accurately weigh 5.58g of FeCl 3 ·6H 2 O, 2.53 g FeCl 2 4H 2 O, 0.79 g MnCl 2 4H 2 O is dissolved in the beaker that fills 150ml deionized water, adds ammoniacal liquor while stirring, until solution pH is 9, at this moment in the solution, black particle is produced, continues to add deionized water, settles to 200ml, gets mixed solution, will Pour the mixture into a 1L three-necked flask, stir it in a 50°C water bath at 850rpm for 1 hour, put the mixture in a 70°C incubator and age it for 2 hours, then use a magnet to separate the black particles from the mixture and deionize Rinse with water and filter with filter paper until the pH value of deionized water after cleaning is 5-7, dry the obtained black particles at 40°C for 24 hours, take them out and grind them, and roast the black powder at 250°C for 2 hours to obtain the product.

Embodiment 2

[0039] Accurately weigh 5.58g of FeCl 3 ·6H 2 O, 4.10 g FeCl 2 4H 2 O, 0.04 g MnCl 2 4H 2O is dissolved in the beaker that fills 150ml deionized water, adds ammoniacal liquor while stirring, until solution pH is 11, at this moment black particle is produced in solution, continues to add deionized water, settles to 200ml, gets mixed solution, will Pour the mixed solution into a 1L three-neck flask, stir in a 75°C water bath at 850rpm for 3h, then put the mixed solution in a 25°C incubator to age for 2h, then use a magnet to separate the black particles from the solution, and deionized water Rinse and filter with filter paper until the pH of deionized water after washing is 5-7, dry the obtained black particles at 100°C for 4 hours, take them out and grind them, and roast the black powder at 400°C for 0.5h to obtain the product.

Embodiment 3

[0041] Accurately weigh 5.4g of FeCl 3 ·6H 2 O, 1.44g of Fe(NO 3 ) 2 ·6H 2 O, 0.0396 g MnCl 2 4H 2 O, dissolve with deionized water, add potassium hydroxide while stirring, adjust the pH to 6, black particles are produced in the solution, add deionized water, and set the volume to 500ml to obtain a mixed solution, which is placed in a 25°C water bath , stirred for 3 hours, aged the mixture in a 70°C incubator for 2 hours, then separated the black particles from the mixture with a magnet, rinsed the black particles with deionized water, and filtered with filter paper until the cleaned deionized water The pH value is 5-7, the obtained black particles are dried at 100°C for 4 hours, then ground into powder, and the black powder is calcined at 400°C for 5 hours.

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Abstract

The invention relates to an MnO2-doped composite magnetic nanometer adsorbent, its preparation method and its application. The adsorbent comprises a ferric salt, a ferrous salt, and a divalent manganese salt, wherein the mole ratio of the ferric salt to the ferrous salt to the divalent manganese salt is 2:(0.5-3.0):(0.02-0.6). The adsorbent prepared in the invention has a large specific surface area and a good adsorption performance, and can be used for removing pollutants in sewage, such as arsenic (especially trivalent arsenic), and the adsorbent adsorbing the pollutants can be separated and recovered through a magnetic separation process. The adsorbent has the advantages of simple technology, convenient operation, easy material recovery, and recycle realization.

Description

technical field [0001] The invention relates to a composite magnetic nanometer adsorbent doped with manganese dioxide, a preparation method and application thereof, and belongs to the technical field of water treatment and regeneration application. Background technique [0002] Arsenic is one of the highly toxic elements. In recent years, the pollution of arsenic in groundwater has aroused widespread concern. The arsenic content in groundwater in my country's Taiwan, Xinjiang, and Inner Mongolia has seriously exceeded the standard, and the arsenic content can reach up to 2000 μg / L; countries with serious groundwater arsenic pollution in the world include India, Bangladesh, Vietnam, Argentina, Chile, Mexico, Hungary, etc. Long-term arsenic exposure can cause cancer of the skin, lungs, liver, kidneys and bladder. The World Health Organization (WHO), the European Union, the United States, Japan and other countries have set increasingly strict standards for arsenic content in d...

Claims

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Application Information

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IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 彭先佳余莲栾兆坤
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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