A two-step method for removing fluorine-modified polycarboxylic acids from water
By employing a two-step treatment method involving persulfate solution and sulfite and halide ions under vacuum ultraviolet irradiation, the problem of removing fluorinated polycarboxylic acids from water was solved, achieving efficient and low-cost defluorination and avoiding the residue of perfluoroalkyl acids.
CN118702320BActive Publication Date: 2026-06-19SHANDONG WATER & WASTEWATER MONITORING CENT
Patent Information
- Application Number
- CN202410761413.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-13
- Publication Date
- 2026-06-19
- Estimated Expiration
- 2044-06-13
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Figure CN118702320B_ABST
Abstract
This invention relates to a two-step method for removing fluorinated polycarboxylic acids from water. The method comprises two steps: first, adding persulfate to the solution containing fluorinated polycarboxylic acids and conducting an advanced oxidation reaction under vacuum ultraviolet irradiation; second, adjusting the pH of the solution to alkaline with NaOH, then sequentially adding sulfite and halide ions, and continuing the advanced reduction reaction under vacuum ultraviolet irradiation. This invention fully considers the chemical structure of fluorinated polycarboxylic acids, utilizes the characteristics of advanced oxidation and advanced reduction technologies, and properly connects different processes, thereby enhancing the defluorination process and achieving effective removal of fluorinated polycarboxylic acids while avoiding the residue of perfluoroalkyl acids.
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Citation Information
Patent Citations
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