Heavy metal chelating flocculant with double chelating groups and preparation method and application thereof

By preparing a heavy metal chelating flocculant with dual chelating groups, the problem of poor removal efficiency of various heavy metal ions in existing technologies has been solved, achieving efficient and simplified heavy metal wastewater treatment, which is suitable for the treatment of various heavy metal wastewater and incineration fly ash.

CN119370967BActive Publication Date: 2026-06-23HUNAN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202411648081.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2024-11-19
Publication Date
2026-06-23
Estimated Expiration
2044-11-19

AI Technical Summary

Technical Problem

Existing methods for treating heavy metal wastewater are ineffective at removing multiple heavy metal ions, and the treatment process is complex, costly, and difficult to achieve efficient and simplified treatment processes.

Method used

A heavy metal chelating flocculant with dual chelating groups was prepared by introducing two chelating groups, -CSS- and -N(CH2COO-)2, onto the polyethylene polyamine molecule. By utilizing their strong chelating ability and flocculation performance, the efficient removal of various heavy metal ions was achieved.

Benefits of technology

It achieves efficient removal of various heavy metal ions from water, simplifies the treatment process, reduces costs, and has a wide range of applications, suitable for the treatment of various heavy metal wastewater and incineration fly ash.

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Abstract

This invention discloses a heavy metal chelating flocculant possessing both dual chelating groups, its preparation method, and its application. First, a polyethylene polyamine undergoes a nucleophilic addition reaction with carbon disulfide in the presence of a base, thereby forming a -CSS... － The acetate group is introduced at the non-terminal position of the polyethylene polyamine molecule, and then, under strongly alkaline conditions, undergoes an electrophilic substitution reaction with a haloacetate to introduce acetate groups at both ends of the molecule, thus giving the molecule both -CSS and ethyl acetate groups. － and —N(CH2COO) － 2. Two strong chelating groups. The two chelating groups in the molecule complement each other, working synergistically to significantly improve the chelation and binding ability and flocculation and precipitation performance of various heavy metal ions, achieving efficient removal of multiple heavy metals in one step. This invention overcomes the shortcomings of common chelating agents, such as single functional groups, weak chelation ability for some ions, and limited applicability; the preparation process is simple, the reaction conditions are mild, the operation and control are easy, the process is environmentally friendly, and it is easy to realize industrial production.
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