An adsorption treatment method for heavy metals in copper-containing wastewater

By combining modified chitosan composite materials and composite hydrogel microspheres, the problem of removing copper ions and various heavy metals from wastewater produced in the production of high-precision brass strips was solved, achieving efficient and simultaneous heavy metal adsorption and meeting the emission standards of the high-precision electronics industry.

CN122079290APending Publication Date: 2026-05-26江西云盛新材料有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
江西云盛新材料有限公司
Filing Date
2026-04-03
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

Existing technologies are ineffective in treating copper-containing wastewater generated during the production of high-precision brass strips, copper strips, and lead frame copper strips. In particular, they are not effective in removing low-concentration, highly complexed copper ions and various trace heavy metals, and cannot meet the emission standards of the high-precision electronics industry.

Method used

A combined treatment method using modified chitosan composite material, composite fiber filter membrane, and composite hydrogel microspheres was adopted. By leveraging the magnetic responsiveness of the modified chitosan composite material and the introduction of various heavy metal chelating functional groups, combined with the porous structure of the composite hydrogel microspheres and the high specific surface area of ​​the fiber filter membrane, the simultaneous adsorption and separation of copper ions and various heavy metals were achieved.

Benefits of technology

It significantly improves the adsorption capacity and removal rate of copper ions, meets the emission standards of the high-precision electronics industry, achieves simultaneous and efficient removal of multiple heavy metals, and has high processing efficiency, meeting environmental protection requirements.

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Abstract

This invention relates to the field of water treatment technology, specifically to a method for adsorbing heavy metals in copper-containing wastewater. The method includes: preparing a modified chitosan composite material; preparing a composite fiber filter membrane; preparing composite hydrogel microspheres; and treating the copper-containing wastewater. This invention first dissolves chitosan and mixes it with nano-ferric oxide to form a physical coating, imparting magnetic responsiveness to the chitosan. Then, it modifies the chitosan using 1,3,5-phenyltricarboxylic acid and triethylenetetramine. A three-dimensional network cross-linked structure is constructed by reacting glutaraldehyde with the amino groups of chitosan and triethylenetetramine to produce modified chitosan. Finally, graphene oxide is loaded onto the surface and pores of the modified chitosan through impregnation and drying to obtain a modified chitosan composite material. When this material is added to pretreated wastewater, it can significantly improve the adsorption capacity for copper ions in copper-containing wastewater.
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