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Preparation and recovery methods for magnetic clay adsorption material

A technology of clay adsorption and magnetism, applied in the field of environmental pollutant control, can solve the problems of magnetic clay weakening, secondary pollution of water resources, prolonging the magnetic separation time, etc., achieve strong paramagnetic properties, high adsorption efficiency, and avoid agglomeration problems Effect

Inactive Publication Date: 2015-12-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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Problems solved by technology

However, there are still problems in the practical application of this magnetic clay. The ferroferric oxide nanoparticles fixed between the bentonite layers are combined with the bentonite through weak van der Waals force. It is easy to lose, which not only weakens the magnetism of the magnetic clay, prolongs the magnetic separation time, but also may cause secondary pollution of water resources by the lost ferric oxide

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  • Preparation and recovery methods for magnetic clay adsorption material
  • Preparation and recovery methods for magnetic clay adsorption material
  • Preparation and recovery methods for magnetic clay adsorption material

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Embodiment Construction

[0028] The application and effect of the present invention will be described in detail below in conjunction with the example of using magnetic clay material to adsorb methylene blue and the accompanying drawings, but the present invention is not limited to the following examples.

[0029] Figure 1(a) of the infrared spectrum shows the infrared absorption peaks of the prepared magnetic clay material. Among them at 3415.05cm -1 The peak is the vibrational peak of HO-H in the water molecules adsorbed between the clay layers. At 3735.44cm -1 The peak is the vibration of the hydroxyl group in the Si-OH of the clay itself. At 1630.91cm -1 The peak is the bending vibration peak of HO-H in the water molecules between the clay layers. And at 1043.30cm -1 and 796cm -1 The strong peak is the vibration peak of the Si-O-Si tetrahedral lattice structure of the clay itself. The peaks representing the bending vibrations of Al-Al-OH and Al-Mg-OH of the clay itself are combined into one,...

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Abstract

The invention provides preparation and recovery methods for a magnetic clay adsorption material. The preparation process comprises adding a strong base substance into an aqueous solution of a mixture of inorganic ferric / ferrous compounds under the circumstances of nitrogen protection and sufficient stirring, so as to prepare a magnetic nanoparticle; adding an ethanol solution of a surfactant into an aqueous solution of the prepared magnetic nanoparticle, and fully stirring and mixing for reaction; fully mixing a bentonite suspension fully swelled by water with the surface-functionalized magnetic nanoparticle for reaction; and performing sufficient magnetic separation on the reaction product and washing off superfluous metal and nonmetal ions, so as to obtain the magnetic clay material. The magnetic clay material adsorbing dye pollutants can be reestablished and reused through gamma radiation of a 60 Co radioactive source. The provided preparation method is simple, and the prepared magnetic clay absorption material is convenient to use, high in adsorption efficiency, and repeatedly reusable.

Description

technical field [0001] The invention relates to the field of environmental pollutant control, in particular to a preparation and recovery method of a magnetic clay adsorption material. Background technique [0002] Natural bentonite is a good organic pollutant adsorbent due to its low price, high chemical stability and mechanical stability, adsorption swelling, intercalation and ion exchange characteristics. However, natural bentonite has a small specific surface area and weak adsorption capacity, and its direct application in industrial wastewater treatment is not efficient. The modification of organic molecules can not only increase the specific surface area of ​​bentonite, but also prepare composite clay adsorbents with high adsorption performance by adjusting the hydrophilic-hydrophobic properties of the lamellar surface. However, natural bentonite and organically modified bentonite are directly used as adsorbents to treat organic pollutants in industrial wastewater, wh...

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Application Information

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IPC IPC(8): B01J20/12B01J20/28B01J20/30C02F1/28
Inventor 张海黔娄志超胡晓丹张伟张晓红周志伟
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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