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Preparation method of halloysite supported needle-like Fe3O4 nanocomposite

A nano-composite material, ferric ferric oxide technology, applied in the field of water treatment, can solve the problems of small size of nano-materials, low removal efficiency, difficulty in recycling, etc. Effect

Active Publication Date: 2017-08-25
YANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because most of the nanomaterials are powdered adsorbents put into the water body, it is difficult to recycle, causing secondary pollution, and the nanomaterials are easy to agglomerate due to their small size, resulting in low removal efficiency and other shortcomings.

Method used

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  • Preparation method of halloysite supported needle-like Fe3O4 nanocomposite
  • Preparation method of halloysite supported needle-like Fe3O4 nanocomposite
  • Preparation method of halloysite supported needle-like Fe3O4 nanocomposite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Add 50 g of halloysite into the mixed iron salt solution of ferric sulfate and ferrous chloride (the mass of metal salt is 50 g), and mechanically stir at 250rpm / min to make the metal salt ions and halloysite evenly and fully contact .

[0037] (2) Pass inert gas nitrogen into (1), and continue stirring to remove oxygen in the system.

[0038] (3) Add 1 L of 0.5 mol / L sodium hydroxide aqueous solution dropwise to (2), and continue to stir at a speed of 150-300 rpm / min to fully react.

[0039] (4) Place the reaction product in (3) under the force of a magnetic field to separate the solid phase from the solution.

[0040] (5) The solid phase was washed several times with deionized water and ethanol until neutral, and then freeze-dried to obtain a composite material.

Embodiment 2

[0042] (1) Add 50 g of halloysite into the mixed iron salt solution of ferric chloride and ferrous sulfate (the mass of the metal salt is 100 g), and mechanically stir at 300 rpm / min to make the metal salt ions and the natural ore halloysite uniform, full contact.

[0043] (2) Introduce nitrogen into (1), and continue to stir to remove oxygen in the system.

[0044] (3) Add 1 L of 0.5mol / L aqueous ammonia solution dropwise to (2), and continue to stir at a speed of 150-300 rpm / min to fully react.

[0045] (4) Place the reaction product in (3) under the force of a magnetic field to separate the solid phase from the solution.

[0046] (5) The solid phase was washed several times with deionized water and ethanol until neutral, and then freeze-dried to obtain a composite material.

Embodiment 3

[0048] (1) Add 50 g of halloysite into the mixed salt solution of ferric sulfate and ferric acetate (the mass of the metal salt is 150 g), and mechanically stir at 150 rpm / min for 2 h, so that the metal salt ions and the natural ore halloysite are uniformly and fully mixed. touch.

[0049] (2) Introduce nitrogen into (1), and continue to stir to remove oxygen in the system.

[0050] (3) Add 0.5 L of 1 mol / L sodium hydroxide aqueous solution to (2) dropwise, and continue stirring at a speed of 150-300 rpm / min to fully react.

[0051] (4) Place the reaction product in (3) under the force of a magnetic field to separate the solid phase from the solution.

[0052] (5) The solid phase was washed several times with deionized water and ethanol until neutral, and then freeze-dried to obtain a composite material.

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Abstract

The invention provides a preparation method of a halloysite supported needle-like Fe3O4 nanocomposite and belongs to the technical field of water treatment. Natural ore, namely, halloysite is mixed with an aqueous iron salt solution, then aqueous alkali is added to the solution, the mixture is subjected to a reaction in inert gas atmosphere, a reaction product is subjected to magnetic separation, and a solid-phase material is obtained; the solid-phase material is washed with deionized water and ethanol to neutral and subjected to freeze drying, and the halloysite supported needle-like Fe3O4 nanocomposite is obtained. The prepared nanocomposite has the advantages that the problems of agglomeration inactivation and secondary water pollution of a nanomaterial and arsenic removal difficulty at present are solved, water arsenic adsorption property is better, water arsenic removal efficiency is higher, As (III) can be removed effectively, the preparation process is simple and reliable, and the production cycle is shorter.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to the preparation technology of water arsenic purification materials. Background technique [0002] Arsenic is a metalloid element ubiquitous in nature. According to different forms, arsenic can be divided into inorganic arsenic and organic arsenic. According to different valences, arsenic can be further divided into positive pentavalent arsenic As (V) and positive trivalent arsenic As (III). Among them, trivalent inorganic arsenic is the most toxic. Due to the high toxicity and migration characteristics of arsenic, arsenic pollution poses a huge threat to human health and ecological environment, and arsenic pollution in water has attracted widespread attention worldwide. [0003] The U.S. Environmental Protection Agency (USEPA) and World Health Organization (WHO), as well as current Chinese standards, all set a limit of 10 ppb for arsenic in drinking water. ...

Claims

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Application Information

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IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28C02F1/48
CPCB01J20/06B01J20/12B01J20/28007B01J20/28009C02F1/281C02F1/488
Inventor 宋晓丽周蕾李凌张树伟
Owner YANGZHOU UNIV
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