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Synthetic method of iron-based magnetic nano goethite

A technology of magnetic nano and synthetic methods, applied in chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the difficult recovery of goethite catalysts, secondary pollution, etc. problem, to achieve the effect of easy magnetic properties, low cost and high catalytic activity

Inactive Publication Date: 2014-05-28
HEILONGJIANG ACAD OF SCI INST OF NATURAL RESOURCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that existing goethite catalysts are difficult to recycle and easily cause secondary pollution, and to provide a synthetic method for iron-based magnetic nano goethite

Method used

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  • Synthetic method of iron-based magnetic nano goethite
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  • Synthetic method of iron-based magnetic nano goethite

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specific Embodiment approach 1

[0026] Specific embodiment one: the synthetic method of iron-based magnetic nano-goethite in this embodiment is implemented according to the following steps:

[0027] 1. Dissolve the ferric salt in deionized water to prepare a ferric salt solution with a concentration of 0.2-2.0mol / L;

[0028] 2. Press nFe 2+ / nFe 3+ =0.01~0.25 Add ferrous iron salt to ferric salt solution, mix evenly to obtain mixed solution;

[0029] 3. Add the alkaline solution with a concentration of 0.5 to 2.0 mol / L dropwise into the mixed solution in step 2, and stir while adding dropwise until no precipitation occurs in the solution to obtain a suspension;

[0030] 4. Adjust the pH value of the suspension in step 3 to 9-12, leave it to settle for 60-120 minutes, and then activate it for 24-48 hours at a temperature of 40-80° C. to obtain a reaction mixture;

[0031] 5. Filter the reaction mixture obtained in step 4, wash the collected solid phase with distilled water until the pH of the washing solut...

specific Embodiment approach 2

[0035] Specific embodiment two: the difference between this embodiment and specific embodiment one is that step two press nFe 2+ / nFe 3+ =0.03~0.1 Add ferrous salt to ferric salt solution. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0036] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that step 3 uses magnetic stirring, and the stirring speed is 100r / min-200r / min. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a synthetic method of iron-based magnetic nano goethite, relates to a synthetic method of magnetic nano goethite and aims at solving the problem that the current goethite catalyst is difficultly recycled and the secondary pollution is easily generated. The synthetic method comprises the following steps: step one, preparing a ferric salt solution; step two, adding ferrous salt into the ferric salt solution to mix evenly and obtain a mixed solution; step three, dropwise adding an alkaline solution into the mixed solution and stirring, thus obtaining a suspension; step four, adjusting pH value of the suspension, stewing and precipitating, then activating to obtain a reaction mixed solution; step five, filtering and collecting solid-phase matter, washing and drying the solid-phase matter to obtain the iron-based magnetic nano goethite. According to the synthetic method, a ferrous salt solution is prepared firstly, and then the ferric salt is added. The iron-based magnetic nano goethite prepared by the synthetic method is great in specific surface area; solid-liquid separation is carried out by using an additional magnetic field, so that the secondary pollution is avoided; the iron-based magnetic nano goethite is high in catalytic activity and capable of accelerating decomposition of ozone to generate hydroxyl radicals, and increasing the generation rate and the number of the radicals in water.

Description

technical field [0001] The invention relates to a synthesis method of magnetic goethite. Background technique [0002] With the rapid development of industry and the improvement of human material living standards, water pollution has become a common concern. Some refractory toxic and harmful pollutants in water, although the concentration is low, are harmful and difficult to remove. Traditional water treatment processes cannot effectively remove these toxic and harmful micro-pollutants, directly threatening the safety of urban water supply. [0003] In the field of water treatment, heterogeneous metal-catalyzed ozonation technology has become a current research hotspot because of its high-efficiency oxidation performance and simple catalyst preparation. Goethite widely exists in nature and has stable chemical properties, high specific surface area and fine particle structure. The research group of the patent applicant used the laboratory-synthesized nano-goethite to cataly...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/745C02F1/78
Inventor 袁磊陈忠林倪红伟沈吉敏张继舟
Owner HEILONGJIANG ACAD OF SCI INST OF NATURAL RESOURCES
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