Method for preparing magnetic copper ion imprinting material from steel pickling waste liquid and application of method

Abstract

The invention discloses a method for preparing a magnetic copper ion imprinting material from steel pickling waste liquid and application of the method. The method comprises the following steps: adding the steel pickling waste liquid into a chitosan acid solution, and uniformly mixing; adjusting the pH to 9-11, heating to react to generate black precipitate, separating the black precipitate out and putting the black precipitate into a copper salt solution, and adding a cross-linking agent for cross-linking reaction; washing the product to be neutral, and eluting the product with the acid solution until no copper ion is contained; performing magnetic separation to obtain the magnetic product namely the magnetic copper ion imprinting material. With adoption of the method, high efficiency and simpleness are realized, high energy consumption instruments such as an ultrasonic apparatus are not needed; the obtained magnetic copper ion imprinting material has high specific adsorbability to copper ions, can be recycled, is stable in chemical properties, does not release toxic substances, and is free of secondary pollution; the water liquid serves as an iron source, so that the waste material is turned into things of value, the cost is decreased, and the pollution is reduced. An excellent application prospect is realized for comprehensive utilization of steel pickling water liquid and treatment of copper-containing wastewater, and huge environmental and economical benefits are realized.

Description

technical field

[0001] The invention relates to a method for preparing a magnetic copper ion imprinting material by using iron and steel pickling waste liquid and its application. Background technique

[0002] Since the National Standard of the People's Republic of China "Electroplating Pollutant Discharge Standard" (GB21900~2008) has been approved by relevant departments and officially implemented, electroplating enterprises no longer implement the "Comprehensive Wastewater Discharge Standard" (GB8978~1996) and "Comprehensive Discharge of Air Pollutants" Standards" (GB16297 ~ 1996) in the relevant provisions. According to the "Integrated Wastewater Discharge Standard" (GB8978-1996), the total copper discharge limit for the second-level standard is 1.0 mg / L, and the third-level standard is 2.0 mg / L, which does not meet the "Electroplating Pollutant Discharge Standard" now. (GB21900~2008) the emission limit of total copper emission is 0.5 mg / L. Therefore, electroplating ent...

Examples

Embodiment 1

[0062] The method for preparing magnetic copper ion imprinting material by using iron and steel pickling waste liquid includes the following steps:

[0063] (1) Weigh 2.0 g of chitosan powder and dissolve it in 200 mL of 3.5% acetic acid solution to form a chitosan-acetic acid solution;

[0064] (2) Add 5 mL of iron and steel pickling waste to the upper system, stir to make the solution fully mixed; where the total iron content in the iron and steel pickling waste is 100 g / L;

[0065] (3) Add 30 mL of 5 mol / L ammonia water dropwise to the upper step system until the pH of the reaction system reaches 10, and continue to heat and stir for 3.5 h at 65°C;

[0066] (4) After the reaction, the black precipitate produced in the system is separated by a magnetic separation method, and washed to neutrality to obtain the initial magnetic chitosan mixture;

[0067] (5) Put the initial magnetic chitosan mixture obtained in the previous step in a 150 mg / L copper sulfate solution and fully react, add...

Embodiment 2

[0075] Example 2: The optimal choice of the amount of crosslinking agent

[0076] The preparation method of magnetic copper ion imprinting material with different amounts of glutaraldehyde includes the following steps:

[0077] (1) Weigh 2.0 g of chitosan powder and dissolve it in 200 mL of 3.5% acetic acid solution to form a chitosan-acetic acid solution;

[0078] (2) Add 5 mL of iron and steel pickling waste to the upper system, stir to make the solution fully mixed; where the total iron content in the iron and steel pickling waste is 100 g / L;

[0079] (3) Add 30 mL of 5 mol / L ammonia water dropwise to the upper step system until the pH of the reaction system reaches 10, and continue to heat and stir for 3.5 h at 65°C;

[0080] (4) After the reaction, the black precipitate produced in the system is separated by magnetic separation method, and washed with deionized water to neutrality to obtain the initial magnetic chitosan mixture;

[0081] (5) Put the initial magnetic chitosan mixtur...

Embodiment 3

[0088] The method for preparing magnetic copper ion imprinting material by using iron and steel pickling waste liquid includes the following steps:

[0089] 1) Weigh 2.0 g of chitosan powder and dissolve it in 200 mL of 2% hydrochloric acid solution to form a chitosan-acetic acid solution;

[0090] 2) Add 5 mL of iron and steel pickling waste to the previous system, stir to make the solution fully mixed; among them, the total iron content in the iron and steel pickling waste is 200 g / L;

[0091] 3) Add 5 mol / L ammonia water dropwise to the upper step system until the pH of the reaction system reaches 11, and continue to heat and stir for 2 h at 70°C;

[0092] 4) After the reaction, the black precipitate produced in the system is separated by magnetic separation method, and washed with deionized water to neutrality to obtain the initial magnetic chitosan mixture;

[0093] 5) Put the initial magnetic chitosan mixture obtained in the previous step in a 200 mg / L copper sulfate solution and ...

technical field

[0001] The invention relates to a method for preparing a magnetic copper ion imprinting material by using iron and steel pickling waste liquid and its application. Background technique

[0002] Since the National Standard of the People's Republic of China "Electroplating Pollutant Discharge Standard" (GB21900~2008) has been approved by relevant departments and officially implemented, electroplating enterprises no longer implement the "Comprehensive Wastewater Discharge Standard" (GB8978~1996) and "Comprehensive Discharge of Air Pollutants" Standards" (GB16297 ~ 1996) in the relevant provisions. According to the "Integrated Wastewater Discharge Standard" (GB8978-1996), the total copper discharge limit for the second-level standard is 1.0 mg / L, and the third-level standard is 2.0 mg / L, which does not meet the "Electroplating Pollutant Discharge Standard" now. (GB21900~2008) the emission limit of total copper emission is 0.5 mg / L. Therefore, electroplating ent...

Examples

Embodiment 1

[0062] The method for preparing magnetic copper ion imprinting material by using iron and steel pickling waste liquid includes the following steps:

[0063] (1) Weigh 2.0 g of chitosan powder and dissolve it in 200 mL of 3.5% acetic acid solution to form a chitosan-acetic acid solution;

[0064] (2) Add 5 mL of iron and steel pickling waste to the upper system, stir to make the solution fully mixed; where the total iron content in the iron and steel pickling waste is 100 g / L;

[0065] (3) Add 30 mL of 5 mol / L ammonia water dropwise to the upper step system until the pH of the reaction system reaches 10, and continue to heat and stir for 3.5 h at 65°C;

[0066] (4) After the reaction, the black precipitate produced in the system is separated by a magnetic separation method, and washed to neutrality to obtain the initial magnetic chitosan mixture;

[0067] (5) Put the initial magnetic chitosan mixture obtained in the previous step in a 150 mg / L copper sulfate solution and fully react, add...

Embodiment 2

[0075] Example 2: The optimal choice of the amount of crosslinking agent

[0076] The preparation method of magnetic copper ion imprinting material with different amounts of glutaraldehyde includes the following steps:

[0077] (1) Weigh 2.0 g of chitosan powder and dissolve it in 200 mL of 3.5% acetic acid solution to form a chitosan-acetic acid solution;

[0078] (2) Add 5 mL of iron and steel pickling waste to the upper system, stir to make the solution fully mixed; where the total iron content in the iron and steel pickling waste is 100 g / L;

[0079] (3) Add 30 mL of 5 mol / L ammonia water dropwise to the upper step system until the pH of the reaction system reaches 10, and continue to heat and stir for 3.5 h at 65°C;

[0080] (4) After the reaction, the black precipitate produced in the system is separated by magnetic separation method, and washed with deionized water to neutrality to obtain the initial magnetic chitosan mixture;

[0081] (5) Put the initial magnetic chitosan mixtur...

Embodiment 3

[0088] The method for preparing magnetic copper ion imprinting material by using iron and steel pickling waste liquid includes the following steps:

[0089] 1) Weigh 2.0 g of chitosan powder and dissolve it in 200 mL of 2% hydrochloric acid solution to form a chitosan-acetic acid solution;

[0090] 2) Add 5 mL of iron and steel pickling waste to the previous system, stir to make the solution fully mixed; among them, the total iron content in the iron and steel pickling waste is 200 g / L;

[0091] 3) Add 5 mol / L ammonia water dropwise to the upper step system until the pH of the reaction system reaches 11, and continue to heat and stir for 2 h at 70°C;

[0092] 4) After the reaction, the black precipitate produced in the system is separated by magnetic separation method, and washed with deionized water to neutrality to obtain the initial magnetic chitosan mixture;

[0093] 5) Put the initial magnetic chitosan mixture obtained in the previous step in a 200 mg / L copper sulfate solution and ...

Images