Synthesis of magnetic nano-adsorbent material and application method thereof to the treatment of heavy metal waste liquid

An adsorption material and magnetic nanotechnology, applied in the field of environmental chemistry, can solve problems such as lack of adsorption capacity, achieve the effects of shortening treatment time, reducing sewage treatment costs, and avoiding secondary pollution

Inactive Publication Date: 2016-04-06
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the past few years, various types of magnetic nanoparticles have been synthesized and used for the adsorption of heavy metal ions. However, these materials are still lacking in adsorption capacity and are only in the laboratory stage.

Method used

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  • Synthesis of magnetic nano-adsorbent material and application method thereof to the treatment of heavy metal waste liquid
  • Synthesis of magnetic nano-adsorbent material and application method thereof to the treatment of heavy metal waste liquid
  • Synthesis of magnetic nano-adsorbent material and application method thereof to the treatment of heavy metal waste liquid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 1.5g FeCl to 50mL Erlenmeyer flask 3 ·6H 2 O. Mix 30mL ethylene glycol, 1.8g urea, and 0.35g EDTA, stir and dissolve at 50°C. After complete dissolution, the reaction solution was transferred to a 50mL high-temperature reactor, and reacted at 200°C for 6h. After the reaction, the obtained precipitate was separated from the reaction medium by an external magnetic field, and washed with deionized water several times successively to obtain Fe 3 o 4 Magnetic nanoparticles were precipitated, suspended in 150ml deionized water, and stored at 4°C for later use.

Embodiment 2

[0023] The prepared Fe 3 o 4 -EDTA, with Cu 2+ Optimizing the pH adsorption conditions for the adsorption object. see results figure 2 .

[0024] figure 2 , it can be seen from the figure that when the pH is 3-6, the adsorption capacity of the adsorbent increases with the increase of pH; when the pH is 6-9, the adsorption capacity reaches a plateau. It can be seen that the pH of the solution has a strong influence on the adsorption process, and the pH should be kept above 6 to perform complete adsorption; at the same time, when the pH<3, the adsorbent hardly has any adsorption, indicating that it can Regeneration of the adsorbent is achieved.

Embodiment 3

[0026] Treat the waste liquid produced by the COD detector according to the steps of reduction-adsorption. First, add reducing iron powder to the solution until there is insoluble iron powder. Shake for 1-3 minutes to make the reduction reaction fully. Adjust the pH to above 7, add magnetic nano-adsorption materials, shake for 5-10 minutes to make the adsorption reaction sufficient, and then use a magnet to adsorb the magnetic materials. see results image 3 , where a is the original waste liquid, the yellow color of the solution is caused by a large amount of dichromate in the solution; b is that after adding iron powder, the dichromate is reduced to Cr 3+ , the color presented is blue; c is the image of b solution mixed with the adsorbent in equal volume, and the metal ions in the solution are removed by magnet adsorption after adsorption. As can be seen from the figure, the supernatant was clear and transparent. After the supernatant was removed, the residual metal ion co...

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Abstract

The present invention relates to synthesis of a magnetic nano-adsorbent material and an application method thereof to the treatment of a heavy metal waste liquid. First, a magnetic nanoparticle material capable of specific complexation with heavy metals ion in water to form a complex is synthesized; in an external magnetic field, the complex quickly gathers from the waste liquid into the direction of the magnetic field to form a solid phase; and water phase separation is carried out to achieve the removal of heavy metal ions in water. At the same time, aiming at the characteristics of high concentrations of heavy metals and acid environment of the effluent produced by a COD detector, the invention develops a reduction-adsorption-regeneration treatment flow: reducibility iron powder reduces dichromate into trivalent chromium ions under acidic condition; then the magnetic adsorbent material is used to adsorb and remove metal ions under slightly alkaline condition; and finally the adsorbent material is regenerated under acidic condition. The nano-adsorbent material and application thereof can realize fast, efficient and low-cost removal of heavy metal ions in water, and provide a novel method for treatment of heavy metal contaminated waste liquid.

Description

technical field [0001] The invention relates to the synthesis of a magnetic nano-adsorption material and its method for treating heavy metal waste liquid. Specifically, it refers to the synthesis of a magnetic nano-complex adsorption material, which is used for the treatment of heavy metals in conjunction with the reduction-adsorption-regeneration process. Waste liquid treatment method. The method belongs to the field of environmental chemistry. Background technique [0002] Heavy metal pollution has become one of the most serious environmental pollution problems because heavy metals are not easily degraded, persist in the environment, accumulate continuously in organisms, and have a strong toxic effect on organisms. In recent years, with the continuous attention to heavy metal pollution, the environmental protection law has reached a new extremely low limit for the content of heavy metals in discharged sewage. It is of great significance to develop methods for treating he...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/30C02F1/28C02F1/62
CPCB01J20/0229B01J20/22B01J20/28009B01J2220/46C02F1/288C02F2101/20
Inventor 何裕建杨昆昊周影袁龙飞刘庆菊杜碧柏龚玲玲
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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