Magnetic adsorbent for removing heavy metal in water and method for preparing magnetic adsorbent

A magnetic adsorbent, heavy metal technology, applied in the directions of alkali metal compounds, chemical instruments and methods, adsorption water/sewage treatment, etc., can solve the problems of difficult recycling, poor adsorption performance, low adsorption capacity, etc. The effect of large capacity and high removal rate

Inactive Publication Date: 2016-06-15
CHINA UNIV OF GEOSCIENCES (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Common adsorption materials have certain limitations in practical application, and are often limited by problems such as low adsorption capacity, high cost, and unsuitable recycling. For example, Chinese patent CN103447010A discloses a modified polyvinyl alcohol-chitosan microsphere Mercury adsorbent, the adsorbent is obtained by mixing polyvinyl alcohol and chitosan as the matrix, and depositing bromide a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The present embodiment removes the magnetic adsorbent of heavy metal in water, and described adsorbent is that magnetic chitosan-polyvinyl alcohol microsphere is made through glutaraldehyde cross-linking modification and carbon disulfide modification successively; Wherein the magnetic chitosan - Polyvinyl alcohol microspheres are prepared from chitosan, polyvinyl alcohol and nanometer ferric oxide; the mass ratio of chitosan, polyvinyl alcohol and nanometer ferric oxide is 1:1:1.

[0040] The preparation method of the magnetic adsorbent for removing heavy metals in water in this embodiment, the specific operation steps are:

[0041]1) Dissolve 6g of chitosan powder in 150mL of 2% acetic acid solution, mechanically stir at 30°C and 150rpm for 1 hour, and stir until uniformly mixed to obtain a chitosan solution for subsequent use; weigh 6g of polyvinyl alcohol (PVA1788 ) powder was dissolved in 150mL deionized water, and mechanically stirred at 30°C and 150rpm for 1 hour ...

Embodiment 2

[0047] The present embodiment removes the magnetic adsorbent of heavy metal in water, and described adsorbent is that magnetic chitosan-polyvinyl alcohol microsphere is made through glutaraldehyde cross-linking modification and carbon disulfide modification successively; Wherein the magnetic chitosan - Polyvinyl alcohol microspheres are prepared from chitosan, polyvinyl alcohol and nanometer ferric oxide; the mass ratio of chitosan, polyvinyl alcohol and nanometer ferric oxide is 1:1:1.

[0048] The preparation method of the magnetic adsorbent for removing heavy metals in water in this embodiment, the specific operation steps are:

[0049] 1) Weigh 6g of chitosan powder and dissolve it in 150mL of 2% acetic acid solution, mechanically stir at 25°C and 180rpm for 1h, fully stir until uniformly mixed to obtain chitosan solution, and set aside; weigh 6g of polyvinyl alcohol (PVA1788 ) powder was dissolved in 150mL deionized water, and mechanically stirred at 25°C and 180rpm for 1...

Embodiment 3

[0055] The present embodiment removes the magnetic adsorbent of heavy metal in water, and described adsorbent is that magnetic chitosan-polyvinyl alcohol microsphere is made through glutaraldehyde cross-linking modification and carbon disulfide modification successively; Wherein the magnetic chitosan - Polyvinyl alcohol microspheres are prepared from chitosan, polyvinyl alcohol and nanometer ferric oxide; the mass ratio of chitosan, polyvinyl alcohol and nanometer ferric oxide is 1:1:1.

[0056] The preparation method of the magnetic adsorbent for removing heavy metals in water in this embodiment, the specific operation steps are:

[0057] 1) Dissolve 6g of chitosan powder in 150mL of 2% acetic acid solution, mechanically stir at 35°C and 200rpm for 1 hour, stir until uniformly mixed to obtain a chitosan solution, and set aside; weigh 6g of polyvinyl alcohol (PVA1788 ) powder was dissolved in 150mL deionized water, and mechanically stirred at 35°C and 200rpm for 1 hour to obta...

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Abstract

The invention relates to the technical field of water treatment, and specifically discloses a magnetic adsorbent for removing heavy metals in water and a preparation method thereof. The adsorbent is prepared by sequentially modifying magnetic chitosan-polyvinyl alcohol microspheres through glutaraldehyde cross-linking modification and carbon disulfide modification; wherein the magnetic chitosan-polyvinyl alcohol microspheres are made of chitosan, polyvinyl alcohol Vinyl alcohol and nano-magnetic iron are prepared as raw materials; the mass ratio of chitosan, polyvinyl alcohol and nano-magnetic iron is 1:1:1. The present invention makes the adsorbent magnetic by adding nano-magnetic iron, and uses glutaraldehyde and carbon disulfide to modify the magnetic chitosan-polyvinyl alcohol microspheres to enhance the mechanical strength of the adsorbent and the adsorption effect on heavy metal ions, so that The prepared adsorbent has the characteristics of large adsorption capacity, high removal rate of various heavy metal ions, magnetic separation under an external magnetic field, and renewable recycling, and can be used to remove heavy metals in domestic sewage, industrial wastewater and natural water.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a magnetic adsorbent for removing heavy metals in water and a preparation method thereof. Background technique [0002] Water is an important resource for human survival, but heavy metal pollution in water has become a fairly common global problem. Since our country entered the stage of rapid development and urbanization, due to sewage irrigation in agricultural activities, abuse of chemical fertilizers and pesticides, industrial production, including mining, metallurgy, electronics, chemical industry, machinery manufacturing and other industries, the substandard discharge and leakage of wastewater, and the disposal of solid waste Improper treatment, unreasonable recharge of sewage, etc. have caused the problem of heavy metal pollution in water bodies to become increasingly prominent. Although some heavy metals are essential trace elements for the human body, excessive c...

Claims

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Application Information

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IPC IPC(8): B01J20/28B01J20/26B01J20/24B01J20/30C02F1/28C02F101/20
CPCB01J20/28009B01J20/0229B01J20/24B01J20/261B01J20/265C02F1/288C02F2101/20
Inventor 陈男吕龙冯传平
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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