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Preparation method of magnetic nanometer iron oxide adsorbent for removing arsenic from water

A magnetic nano, iron oxide technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, alkali metal oxides/hydroxides, etc. complex problems, to achieve the effects of low raw material and preparation cost, short synthesis cycle, and simple preparation process

Inactive Publication Date: 2013-09-04
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Most of the magnetic nano-adsorption materials in the prior art are composed of magnetic substrates and adsorption materials, or directly loaded magnetic adsorption materials on a suitable substrate. The preparation process is relatively complicated, and the nano-matrix in the raw material also has the disadvantage of being expensive.
In addition, most of the existing adsorption materials selectively adsorb arsenic in different valence states, and cannot simultaneously have high adsorption capacity for trivalent arsenic and pentavalent arsenic

Method used

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  • Preparation method of magnetic nanometer iron oxide adsorbent for removing arsenic from water
  • Preparation method of magnetic nanometer iron oxide adsorbent for removing arsenic from water
  • Preparation method of magnetic nanometer iron oxide adsorbent for removing arsenic from water

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Dissolve 16.2 grams of ferric nitrate nonahydrate in 180 milliliters of pure water, dissolve 6.4 grams of sodium hydroxide in 100 milliliters of pure water, mix the above two solutions, centrifuge the precipitate, add 7.2 grams of glacial acetic acid (iron and glacial acetic acid The molar ratio is 1:3), magnetically stirred for about 1 hour until the hydrated iron oxide colloid was formed, then added 400 ml of acetone and continued to stir for 1 hour, after standing still, centrifuged, dried, and then roasted in the air at 250 ° C for 3 hours, That is to obtain magnetic nano-iron oxide, and the transmission electron microscope shows that the basic particle size is about 10-30 nanometers (such as figure 1 shown), the magnetization curve shows that it is magnetic in a magnetic field (as figure 2 shown), X-ray diffraction structure analysis shows that the main crystal phase of the material is α-Fe 2 o 3 with γ-Fe 2 o 3 (Such as image 3 shown). Each gram of the mat...

Embodiment 2

[0026] Dissolve 10.8 grams of ferric chloride hexahydrate in 180 milliliters of pure water, dissolve 8.5 grams of sodium carbonate in 100 milliliters of pure water, mix the above two solutions, centrifuge the precipitate, add 14.4 grams of glacial acetic acid (iron and glacial acetic acid The molar ratio is 1:6), magnetically stirred for about 1 hour until the hydrated iron oxide colloid was formed, then added 100 ml of propanol and continued to stir for 1 hour, after standing still, centrifuged, dried, and then roasted in nitrogen at 250 ° C for 3 hours , that is, the magnetic nano-iron oxide is obtained, and the X-ray diffraction structure analysis shows that the main crystal phase of the material is γ-Fe 2 o 3 (Such as Figure 4 shown). Each gram of the material can absorb more than 30 mg of inorganic trivalent arsenic and more than 40 mg of inorganic pentavalent arsenic in water.

Embodiment 3

[0028] Dissolve 16.2 grams of ferric nitrate nonahydrate in 180 milliliters of pure water, dissolve 6.4 grams of sodium hydroxide in 100 milliliters of pure water, mix the above two solutions, centrifuge the precipitate, add 120 grams of glacial acetic acid (iron and glacial acetic acid The molar ratio is 1:50), magnetically stirred for 0.3 hours until the hydrated iron oxide colloid was formed, then added 100 ml of propionaldehyde and continued to stir for 1 hour, left to stand, centrifuged, dried, and then baked in argon at 600 °C for 3 hours , that is, the magnetic nano-iron oxide is obtained, and the X-ray diffraction structure analysis shows that the main crystal phase of the material is γ-Fe 2 o 3 . Each gram of the material can absorb more than 20 mg of inorganic trivalent arsenic and more than 30 mg of inorganic pentavalent arsenic.

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Abstract

The invention provides a preparation method of a magnetic nanometer iron oxide adsorbent for removing arsenic from water and belongs to the technical field of synthesis of a magnetic nanometer adsorbing material for water pollution control. The preparation method comprises the following steps of: step one, mixing a ferric salt aqueous solution and an alkaline aqueous solution to prepare ferric hydroxide, centrifugally separating ferric hydroxide, adding glacial acetic acid, and stirring till forming a hydration ferric oxide colloidal solution; and step two, adding an organic solvent to the colloidal solution, so that hydration ferric oxide reacts with the organic solvent to form a compound precipitate, separating, drying and baking to obtain the magnetic nanometer iron oxide adsorbent. The prepared magnetic nanometer iron oxide adsorbent is not required to be compounded with other materials; the preparation method is simple; the cost of raw materials is low; and the magnetic nanometer iron oxide adsorbent has a good absorption effect on arsenic in water and can be used for purifying water.

Description

[0001] Technical field [0002] The invention is the field of material synthesis technology, which involves water pollution control control magnetic nano -adsorption materials synthesis technology fields. Background technique [0003] Arsenic, as an element widely distributed in nature, can enter the surface water and groundwater through soil and ore through natural processes and human activities.Arsenic pollution in natural water is a serious problem that threatens the health of many people around the world. In particular, the main morphological arsenic in the groundwater has very strong physiological toxicity.At present, the technical methods of treating arsenic pollution are mainly aerobic, solidification, adsorption, ion exchange method, reverse ionic membrane method, etc. The adsorption method has attracted much attention due to high arsenic efficiency, simple operation, and low cost.It is the key to prepare an efficient adsorbent. Nano -adsorbent has a high ratio area, so t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30C02F1/28C02F1/58
Inventor 李进军程微吴峰周伟莉
Owner WUHAN UNIV
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