Method for synthesizing Cr3<+> absorption resin by taking carboxymethyl potato starch as raw material

A potato starch, carboxymethyl technology, applied in adsorption water/sewage treatment, chemical instruments and methods, water/sewage treatment, etc., can solve the problems of polluted cultivated land, large area, large investment in ion exchange method, etc. The effect of strong adsorption capacity, excellent performance and easy operation

Inactive Publication Date: 2016-11-16
INNER MONGOLIA UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] The process of industrialization and urbanization is getting faster and faster. Industrial sewage, mining wastewater, and urban sewage are discharged directly to the environment without effective treatment, resulting in heavy metal pollution in water areas. At the same time, as these waters are used for irrigation, they also pollute a lot of water. Cultivated land. At present, the treatment methods for heavy metal ions nationwide mainly include neutralization precipitation, sulfide precipitation, chemical reduction, electrochemical reduction, ion exchange, and biological treatment. However, the neutralization precipitation method is not effective for the removal of low-concentration heavy metal ions, and the sulfide precipitation will produce H 2 For secondary pollutants such as S, the cost of electrochemical removal is high, the investment of ion exchange method is large, the area is large, and the treatment period of biological treatment technology is too long, etc.

Method used

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  • Method for synthesizing Cr3&lt;+&gt; absorption resin by taking carboxymethyl potato starch as raw material
  • Method for synthesizing Cr3&lt;+&gt; absorption resin by taking carboxymethyl potato starch as raw material
  • Method for synthesizing Cr3&lt;+&gt; absorption resin by taking carboxymethyl potato starch as raw material

Examples

Experimental program
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Effect test

Embodiment 1

[0022] Example 1: Weigh 5g of carboxymethyl potato starch and 50ml of deionized water and mix evenly, add 6ml of 30% hydrogen peroxide and oxidize at 50°C for 1h, measure 20g (19.1ml) of acrylic acid, weigh 5.6g of sodium hydroxide and dissolve in In 30ml of deionized water, use the NaOH solution prepared above to neutralize acrylic acid under cooling in an ice-water bath, fully mix the neutralized acrylic acid and its sodium salt solution with the oxidized carboxymethyl potato starch solution, and add 4ml of 2.5mg / ml N, N'-methylenebisacrylamide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, and keep warm at 80°C for 2 hours. The product is dried and crushed to obtain the product. The product prepared in this example is in Cr in a solution with a concentration of 25ppm 3+ The adsorption capacity is 113.1mg / g.

Embodiment 2

[0023] Example 2: Weigh 5g of carboxymethyl potato starch and mix with 50ml of deionized water evenly, add 6ml of hydrogen peroxide and oxidize at 50°C for 1h, measure 20g (19.1ml) of acrylic acid, weigh 5.6g of sodium hydroxide and dissolve in 50ml of deionized water Ionized water, use the sodium hydroxide solution prepared above to neutralize acrylic acid under cooling in an ice-water bath, fully mix the neutralized acrylic acid and its salt solution with the oxidized carboxymethyl potato starch solution, and add 6ml to a concentration of 2.5 mg / ml N, N'-methylenebisacrylamide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. The product that is made by the present embodiment is 35ppmCr at concentration 3+ Cr in the solution 3+ The adsorption capacity is 157...

Embodiment 3

[0024] Example 3: Weigh 5g of carboxymethyl potato starch and 50ml of deionized water and mix evenly, add 6ml of hydrogen peroxide and oxidize at 50°C for 1h, measure 30g (28.57ml) of acrylic acid, weigh 8.4g of sodium hydroxide and dissolve in 50ml of deionized water Ionized water, use the sodium hydroxide solution prepared above to neutralize acrylic acid under cooling in an ice-water bath, fully mix the neutralized acrylic acid and its salt solution with the oxidized carboxymethyl potato starch solution, and add 4ml to a concentration of 2.5 mg / ml N, N'-methylenebisacrylamide solution, in N 2 Under protection, heat slowly to increase the temperature of the system gradually. After the polymerization reaction starts, stop stirring, continue to raise the temperature slowly, keep it at 80°C for 2 hours, dry and pulverize to obtain the product. The product that is made by present embodiment is 5ppmCr at concentration 3+ Cr in the solution 3+ The adsorption capacity is 23.95mg / ...

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Abstract

The invention discloses a carboxymethyl potato starch as raw material, which is oxidized by hydrogen peroxide and adopts a one-pot method to synthesize and adsorb Cr 3+ The method of resin, its main feature is that hydrogen peroxide oxidizes carboxymethyl potato starch, without separation, washing, purification, with acrylic acid and its sodium salt to remove the polymerization inhibitor, under the protection of nitrogen, a pot of synthetic adsorption Cr 3+ Resin, the product synthesized under optimal conditions has a concentration of 5ppmCr 3+ The adsorption capacity is 23.95mg/g, for a concentration of 55ppmCr 3+ The adsorption capacity is 245.9mg/g, for Cr with a concentration of 5‑55ppm 3+ The removal rate is 89.07%-94.86%; the advantage of the present invention is that hydrogen peroxide oxidizes carboxymethyl potato starch without separation, purification, and washing of traditional oxidized carboxymethyl potato starch, and can be polymerized without adding additional initiators to obtain The products of low concentration and high concentration of Cr 3+ Both have a relatively large adsorption capacity, therefore, the present invention synthesizes and adsorbs Cr 3+ The resin process is simple, low in cost, and easier for large-scale production. 3+ Has a high adsorption capacity, the product contains Cr 3+ It has good application prospects in sewage treatment and soil remediation.

Description

technical field [0001] The invention discloses a novel adsorption Cr 3+ Resin and preparation method thereof, specifically relate to for containing Cr 3+ Sewage treatment, soil and river pollution control, etc., belong to the field of environmental functional materials. Background technique [0002] The process of industrialization and urbanization is getting faster and faster. Industrial sewage, mining wastewater, and urban sewage are discharged directly to the environment without effective treatment, resulting in heavy metal pollution in water areas. At the same time, as these waters are used for irrigation, they also pollute a lot of water. Cultivated land. At present, the treatment methods for heavy metal ions nationwide mainly include neutralization precipitation, sulfide precipitation, chemical reduction, electrochemical reduction, ion exchange, and biological treatment. However, the neutralization precipitation method is not effective for the removal of low-concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F251/00C08F220/06C08F222/38B01J20/24B01J20/30C02F1/28C02F101/20
CPCC08F251/00B01J20/24B01J2220/4825C02F1/286C02F2101/20
Inventor 温国华张建平刘广华李媛张静付渊陈超李源
Owner INNER MONGOLIA UNIVERSITY
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