A self-purifying catalyst for water treatment, its preparation method and application

A water treatment self-purification catalyst prepared by doping bird droppings with copper and sodium sources solves the problems of high cost and high energy consumption in water treatment, and achieves efficient degradation and stable recycling of organic pollutants.

CN116983993BActive Publication Date: 2025-11-14QINGYUAN GRAND COLLABORATIVE INNOVATION RES INST CO LTD
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Patent Information

Application Number
CN202310971204.9
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-08-02
Publication Date
2025-11-14
Estimated Expiration
2043-08-02

AI Technical Summary

Technical Problem

Existing water treatment technologies face bottlenecks in removing micro-pollutants due to high costs and energy consumption, and conventional methods are difficult to effectively remove new pollutants, especially organic pollutants.

Method used

Using bird droppings as a precursor, the water treatment self-purification catalyst is formed by calcining and ball milling followed by doping with copper and sodium sources to create a polarized electric field. It utilizes the lone pair electrons on its surface to capture electrons of pollutants for cracking, avoiding the use of oxidants and external energy.

Benefits of technology

It can efficiently degrade organic pollutants such as tetracycline, ciprofloxacin, diphenhydramine, and rhodamine B under neutral and room temperature conditions. The degradation process does not require pH adjustment and can be recycled multiple times, reducing costs and energy consumption.

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Abstract

This invention relates to the field of water treatment catalyst technology, and in particular to a self-purifying water treatment catalyst, its preparation method, and its application. Bird droppings are stored at 200-400°C for 1-5 hours, then calcined at 450-850°C for 1-3 hours, cooled, and ground to obtain a precursor. The precursor and a copper source are added to ultrapure water and mixed thoroughly. A sodium source is added in batches to the solution from step S2, and the mixture is subjected to low-speed and high-speed stirring sequentially to obtain a mixed suspension of the copper- and sodium-modified precursors. The mixed suspension of the copper- and sodium-modified precursors is subjected to a hydrothermal reaction using a programmed temperature increase method. The hydrothermal reaction product is filtered and washed, then dried using a gradually increasing temperature method, and after natural cooling, the self-purifying water treatment catalyst is obtained. The catalyst of this invention can effectively degrade pollutants without the addition of any oxidants or chemical agents during the reaction process, significantly reducing costs and energy consumption from preparation to treatment.
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Citation Information

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