Preparation method of adsorption filter material capable of synchronously removing fluorine and COD (Chemical Oxygen Demand)

By preparing a filter material composed of hemp stalk-based porous carbon combined with nano-zero-valent iron and fly ash, the problems of complex and costly defluorination and COD removal processes in existing technologies have been solved. This method achieves simultaneous and efficient removal of fluoride and organic matter, with high resource utilization.

CN120838362APending Publication Date: 2025-10-28NAT INST OF CLEAN AND LOW CARBON ENERGY +1
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Patent Information

Application Number
CN202410514752.3
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-04-26
Publication Date
2025-10-28

AI Technical Summary

Technical Problem

In existing technologies, defluorination and COD removal methods are usually performed separately, which are complex and costly, making it difficult to achieve simultaneous and efficient removal.

Method used

An adsorption filter material is prepared by combining hemp stalk-based porous carbon with nano-zero-valent iron and fly ash through carbonization, activation, and calcination, achieving simultaneous fluoride and COD removal functions.

Benefits of technology

It simplifies the treatment process, improves the efficiency of fluoride and COD removal, reduces reagent consumption, and realizes the resource utilization of waste.

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Abstract

The invention provides a preparation method of an adsorption filter material, which comprises the following steps: S1, mixing crushed hemp stalks with concentrated nitric acid, then mixing with water, and then drying to obtain a mixture; carrying out carbonization treatment and activation treatment on the mixture under an anaerobic condition, and cooling to obtain a hemp stem-based porous carbon intermediate; s2, treating the hemp stalk-based porous carbon intermediate with a dilute nitric acid solution, washing with water, and drying to obtain hemp stalk-based porous carbon; s3, pressing raw materials containing the hemp-stem-based porous carbon, nano zero-valent iron and fly ash into a filter material blank; and S4, calcining the filter material blank in an inert atmosphere, and cooling to obtain the adsorption filter material. The adsorption filter material prepared by the method disclosed by the invention realizes the function of synchronously removing fluorine and COD (Chemical Oxygen Demand) from a single material.
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Citation Information

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