Preparing Method for magnetic active carbon used for water treatment

A magnetic activated carbon and water treatment technology, applied in the direction of adsorption water/sewage treatment, magnetic field/electric field water/sewage treatment, chemical instruments and methods, etc., can solve problems such as instability, difficulty in precise control, oxidation, etc.

Inactive Publication Date: 2006-01-04
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the magnetic carbons currently prepared are all based on Fe 3 o 4 Fe as magnetic material 3 o 4 --Activated carbon composite, its preparation should use ferrous salt as raw material, and ferrous salt is very unstable, easy to be oxidized by oxygen in the air or water, so in Fe 3 o 4 --The reaction conditions in the preparation process of activated carbon composites are harsh and difficult to control accurately
And Fe 3 o 4 It is not stable enough and can be oxidized by air, making its magnetism gradually weakened

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Example 1, the preparation of magnetic activated carbon powder: take 0.01mol MnSO 4 and 0.02mol Fe(NO 3 ) 3 , dissolved in 150ml water, add 5g wood activated carbon (100-200 mesh, BET specific surface area 750m 2 / g), under rapid stirring, NaOH solution with a concentration of 4mol / l was added dropwise until pH=8-10. Continue to stir for 30 minutes, then move to a water bath and heat to 90-100°C, let stand and keep warm for 2 hours. After 2 hours of aging, the obtained composite adsorbent has good magnetic reactivity at this time, pour off a large amount of water above, then add 200ml deionized water, stir and wash for 10 minutes, and carry out solidification with magnetic separation or filtration. liquid separation, the solid adsorbent is washed with deionized water for 3-4 times, and after the adsorbent is separated, it is placed in an oven and baked at 50-60°C for 2 hours, and then heated to 120°C for 24 hours to obtain Magnetic activated carbon powder. which co...

example 2

[0014] Example 2, containing 30% CuFe 2 o 4 Preparation of Magnetic Activated Carbon Powder: CuSO 4 ·5H 2 O replaces MnSO 4 , and other operations are the same as above; when heating at high temperature, use N 2 Under protection, the target object can be obtained by baking at 450°C for 2 hours, and the BET specific surface area is 500-600m 2 / g.

example 3

[0015] Example 3. Application of magnetic activated carbon in wastewater treatment: a certain dye wastewater mainly contains acid red B200mg / l, pH5.2, take 1 liter of wastewater, add 5g of MnFe 2 o 4 25% magnetic activated carbon powder adsorbent, stirred and mixed for 30 minutes, then magnetically separated, and the concentration of acid red B in the effluent was measured to be less than 5 mg / l. in N 2 The adsorbent can be recycled after being heated and regenerated under protection.

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Abstract

The present invention provides the preparation process of magnetic active carbon and belongs to the field of water processing technology. The magnetic active carbon has relatively great specific surface area and excellent adsorption performance, and is easy to separate magnetically to recover. The present invention provides the application of magnetic active carbon in water processing to eliminate organic matter and inorganic arsenic.

Description

Technical field: [0001] The invention relates to a method for preparing magnetic activated carbon used for water treatment, which has a large specific surface area, good adsorption performance and is easy to recover by magnetic separation, and belongs to the technical field of water treatment applications. Background technique: [0002] Due to its small particle size and well-developed pore structure, powdered activated carbon has a huge specific surface area. When used as an adsorption material, it has the advantages of fast adsorption speed and high capacity. Moreover, the preparation process of powdered activated carbon is relatively simple, the source of raw materials is wide, and the price is relatively low. Therefore, It is widely used in chemical industry, environmental protection and other fields; it can be used to remove organic or inorganic pollutants in water in water treatment. [0003] However, it is precisely because of the small particle size of powdered carbo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20C02F1/28C01B31/08C02F1/48
Inventor 曲久辉武荣成雷鹏举刘会娟
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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