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

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

Examples

Experimental program
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Example Embodiment

[0036] Example 1

[0037] Accurately weigh 5.58g of FeCl 3 ·6H 2 O, 2.53g FeCl 2 ·4H 2 O, 0.79g MnCl 2 ·4H 2 Dissolve O in a beaker containing 150ml of deionized water, add ammonia water while stirring, until the pH of the solution is 9. At this time, black particles appear in the solution, continue to add deionized water, and make up to 200ml to obtain a mixed solution. The mixture was poured into a 1L three-necked flask, stirred in a 50°C water bath at 850 rpm for 1 hour, and then placed in a 70°C incubator for 2 hours, and then the black particles were separated from the mixture with a magnet and deionized. Rinse with water and filter with filter paper until the pH value of the deionized water after cleaning is 5-7. The obtained black particles are dried at 40°C for 24h, taken out and ground, and the black powder is calcined at 250°C for 2h.

Example Embodiment

[0038] Example 2

[0039] Accurately weigh 5.58g of FeCl 3 ·6H 2 O, 4.10 g FeCl 2 ·4H 2 O, 0.04g MnCl 2 ·4H 2Dissolve O in a beaker containing 150ml of deionized water, add ammonia water while stirring, until the pH of the solution is 11. At this time, there are black particles in the solution, continue to add deionized water, and make up to 200ml to obtain a mixed solution. The mixture was poured into a 1L three-necked flask, stirred for 3 hours in a 75°C water bath at 850 rpm, and then placed in a 25°C incubator for 2 hours, and then the black particles were separated from the solution with a magnet, deionized water Rinse and filter with filter paper until the pH value of the washed deionized water is 5-7. The obtained black particles are dried at 100°C for 4 hours, taken out and ground, and the black powder is calcined at 400°C for 0.5 hours.

Example Embodiment

[0040] Example 3

[0041] Accurately weigh 5.4g of FeCl 3 ·6H 2 O, 1.44g Fe (NO 3 ) 2 ·6H 2 O, 0.0396g MnCl 2 ·4H 2 O, dissolve in deionized water, add potassium hydroxide while stirring, adjust the pH to 6, black particles appear in the solution, add deionized water, and make up to 500ml to obtain a mixed solution, which is placed in a water bath at 25°C , stir for 3h, put the mixture in a 70°C incubator for 2h, then use a magnet to separate the black particles from the mixture, rinse the black particles with deionized water, and filter them with filter paper until the washed deionized water The pH value is 5-7, and 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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