Magnetic expanded graphite for absorbing greasy dirt in water area and its production

A technology of expanded graphite and magnetism, applied in the field of adsorption of magnetic expanded graphite and its preparation, can solve the problems of following the wave and expanding the pollution area, and achieve the effect of good adsorption capacity and excellent performance

Inactive Publication Date: 2007-09-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The recovery capacity of these methods varies greatly with changes in sea conditions and meteorological conditions. When the working conditions are harsh, due to the movement of ocean currents and the turbulence of waves, the oil on the surface of the water body tends to drift with the waves and expand the polluted area.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: adopt the citric acid gel sol method to prepare magnetically expanded graphite, and its steps are as follows:

[0015] 1. Use citric acid to complex ferric nitrate and barium nitrate to prepare ferrite: molar ratio Ba(NO 3 ) 2 : Fe(NO 3 ) 3 : citric acid=1: 12: 19 Weigh raw materials, add distilled water to dissolve, drip ammonia water to adjust the pH value of the solution to 7, and obtain the required ferrite;

[0016] 2. Add expanded graphite to the ferrite obtained in step (1), and control the mass ratio of expanded graphite and ferrite to be 1: 5;

[0017] 3. Put the solution obtained in step (2) in a 90°C water bath and stir for 4-5 hours until the liquid is viscous and colloidal;

[0018] 4. Put the sol obtained in step (3) in an oven at 120°C for 4 hours to obtain a dried gel;

[0019] 5. Put the gel obtained in step (4) into a muffle furnace and heat it to 850° C. at a heating rate of 60° C. / h, keep it warm for 2 hours, and then cool it down ...

Embodiment 2

[0020] Embodiment 2: Adopt co-precipitation method to prepare magnetically expanded graphite, and its steps are as follows:

[0021] 1. Prepare FeCl separately 3 ·6H 2 O, FeCl 2 4H 2 O, NaOH solution;

[0022] 2, the FeCl prepared in step (1) 3 ·6H 2 O, FeCl 2 4H 2 Pour the O solution into the NaOH solution, add expanded graphite, the mass ratio of expanded graphite to ferrite is 1:3, and stir evenly at a temperature of about 80°C until the reaction is completed;

[0023] 3. The stirred solution obtained in step (2) is neutralized with HCl, Fe 3 o 4 Precipitation is wrapped on the surface of expanded graphite;

[0024] 4. Wash the product obtained in step (3) with water, separate it in a centrifuge, and dry it in vacuum to obtain the desired expanded graphite.

Embodiment 3

[0025] Embodiment 3: adopt adhesive process method to prepare magnetically expanded graphite, its steps are as follows:

[0026] 1. Weigh (measure) expanded graphite, ferrite powder and styrene-acrylic acid emulsion according to the ratio (mass ratio) of 1:1:0.1;

[0027] 2. Stir the ferrite powder obtained in step (1) and the styrene-acrylic acid emulsion evenly to obtain a mixture;

[0028] 3. Coagulate and harden the mixture in step (2), and pulverize it in a ball mill to obtain the desired magnetically expanded graphite.

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PUM

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Abstract

A magnetic expanded graphite for adsorbing the oily sewage in a water region is prepared from expanded graphite particles as carrier through depositing a ferrite layer on their surfaces chemically or physically. After said magnetic expanded graphite particles are spread on the water surface in oil polluted region, a mixture system of magnetic expanded graphite and oily sewage is formed, and then can be collected under the action of magnetic field.

Description

technical field [0001] The invention belongs to the technical field of oil pollution control and treatment in water areas, and in particular relates to an adsorption magnetic expanded graphite used for oil pollution in water areas and a preparation method thereof. Background technique [0002] In modern society, petroleum plays an extremely important role as an energy source. However, in the process of oil extraction, processing, transportation and use, a considerable amount of oil leaks and is discarded in rivers and ocean waters, which poses a great threat to the environment. Controlling oil pollution in water areas has become a top priority. Removing oil pollution from water is very difficult. At present, there are chemical methods and physical methods for oil pollution control in the world. [0003] Chemical method: According to the pollution situation, use emulsification dispersion, oil collection or oil coagulation method to control. For oil films with a thickness ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20C02F1/40B01D17/022
Inventor 张晏清
Owner TONGJI UNIV
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