Chitosan-zinc-rare earth ternary functional composite polymeric ferric sulfate and preparation method thereof

By introducing chitosan, zinc, and rare earth elements into polyferric sulfate through a one-pot in-situ polymerization technique, a ternary functional complex is formed, which solves the problem of poor compatibility between components in existing technologies and improves flocculation performance and stability. It is suitable for the deep treatment of complex wastewater from printing and dyeing, papermaking, and other industries.

CN122444306APending Publication Date: 2026-07-24GUANGXI TENGXIAN YUANXIN ENVIRONMENTAL PROT TECH CO LTD
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Patent Information

Application Number
CN202610882157.4
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-06-18
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing modified polyferric sulfates are mostly physical mixtures of single or binary functional components, which makes it difficult to achieve chemical bonding and synergistic effects of chitosan, zinc and rare earth elements, resulting in limited improvement in flocculation performance and poor product stability.

Method used

The one-pot in-situ polymerization technology is adopted. By simultaneously introducing chitosan, zinc-containing compounds and rare earth-containing compounds into the catalytic oxidation polymerization reaction system, the active functional groups on the chitosan molecular chain are coordinated with iron ions to form chitosan-zinc-rare earth ternary functional composite polymeric ferric sulfate, realizing the integrated synergy of the three components at the molecular level.

Benefits of technology

It achieves integrated synergy of chitosan, zinc, and rare earth elements at the molecular level, improving flocculation performance and product stability. It is particularly suitable for the deep treatment of complex wastewater, showing significant effects in removing organic pollutants, reducing color, and accelerating floc settling.

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Abstract

The invention relates to the field of water treatment flocculants, and particularly discloses chitosan-zinc-rare earth ternary functional composite polyferric sulfate and a preparation method thereof.The preparation method comprises the steps that an iron-containing raw material and acid are mixed to form an acid-containing reaction solution; chitosan, a zinc-containing compound and a rare earth-containing compound are added into the reaction liquid, the addition amount of the chitosan is controlled to be 0.5%-5% of the mass of the iron-containing raw material, the molar ratio of Zn to Fe is 0.03-0.12, the molar ratio of rare earth to Fe is 0.005-0.05, and the chitosan and iron ions are coordinated and combined in the catalytic oxidation polymerization process to form a ternary functional composite intermediate; and drying to obtain a solid product. According to the invention, chitosan, zinc and rare earth are embedded into a polymeric ferric sulfate molecular structure through synchronous chemical bonding, so that three-component molecular-level synergistic interaction is realized, the flocculation performance is remarkably improved, floc sedimentation is accelerated, and titanium white waste acid can be utilized for resource production.
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