Attapulgite organic modified polyferric flocculant, preparation method and application thereof

By preparing an organically modified polyferric flocculant from attapulgite, and utilizing its unique structure and covalent bond binding of inorganic and organic components, the problem of removing organic pollutants and heavy metal antimony from dyeing and printing wastewater was solved, achieving efficient and low-cost wastewater treatment.

CN118373504BActive Publication Date: 2026-07-21ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Filing Date
2024-03-28
Publication Date
2026-07-21

AI Technical Summary

Technical Problem

Existing technologies are ineffective at removing organic pollutants and heavy metal antimony from dyeing and printing wastewater, especially failing to meet the total antimony limit in the "Water Pollutant Discharge Standard for Textile Dyeing and Finishing Industry". Furthermore, traditional flocculants are complex to operate and costly.

Method used

An organically modified attapulgite polyferric flocculant was prepared by combining attapulgite, silane coupling agent and ferric chloride. This flocculant has high flocculation performance and utilizes its unique layered chain structure and large specific surface area to bind inorganic and organic components through covalent bonds, thereby achieving efficient removal of organic pollutants and heavy metal antimony from dyeing and printing wastewater.

Benefits of technology

Attapulgite-modified organic polyferric flocculant exhibits high adsorption and bridging capabilities and a wide pH range under mild reaction conditions. It can significantly remove color, organic pollutants, and heavy metal antimony from wastewater, achieving effective wastewater treatment. Moreover, the raw materials are widely available, inexpensive, and easy to operate.

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Abstract

The application discloses a palygorskite organic modified polyferric flocculant, a preparation method and application thereof, and the preparation method of the flocculant comprises the following steps: activating palygorskite with hydrochloric acid, modifying the palygorskite with a silane coupling agent, copolymerizing the modified palygorskite with ferric chloride and sodium hydroxide alkalization, and obtaining the palygorskite organic modified polyferric flocculant through standing, curing and calcining of the product. The flocculant has the advantages of low cost, simple synthesis method, mild reaction condition, good treatment effect, effective reduction of the dosing amount, improved water treatment capacity, excellent removal rates of COD and heavy metal antimony of printing and dyeing wastewater. After the printing and dyeing wastewater is treated by the flocculant, the optimal removal rate of COD reaches 73.2%, and the total antimony removal rate reaches 98.53%.
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