Flowing electrode based on inorganic thickening agent modification, and preparation method and application thereof

By modifying the flow electrode with an inorganic thickener, the problems of sedimentation and aggregation of traditional flow electrodes are solved, achieving efficient and stable operation and high desalination performance of the FCDI system, and improving the system's reliability and service life.

CN122126935APending Publication Date: 2026-06-02SHENYANG UNIVERSITY OF TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
SHENYANG UNIVERSITY OF TECHNOLOGY
Filing Date
2026-03-27
Publication Date
2026-06-02

AI Technical Summary

Technical Problem

Traditional flow electrodes are prone to sedimentation and aggregation during use, leading to flow channel blockage, decreased adsorption efficiency, and system instability, which limits the application of FCDI systems.

Method used

The preparation method of the flow electrode modified by inorganic thickener involves adding activated carbon and conductive carbon black to NaCl solution, and gradually adding layered silicate inorganic thickeners such as bentonite, attapulgite, montmorillonite or sepiolite during stirring to form a three-dimensional network structure to support carbon particles, thereby improving the viscosity and dispersion stability of the slurry.

Benefits of technology

It significantly inhibits the sedimentation of activated carbon and conductive carbon black particles, improves the uniformity of distribution in the flow channel, and achieves efficient and stable operation of the FCDI system. The desalination rate reaches 60.0%-80.0%, the average desalination rate is ≥1.45 μmol·cm-2·min-1, the current efficiency is >85%, and there is no blockage in the flow channel and no sedimentation of the electrode slurry.

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Abstract

This invention provides a flow electrode modified with an inorganic thickener, its preparation method, and its application, relating to the fields of water treatment and electrochemical materials technology. The electrode material is prepared by mixing activated carbon, conductive carbon black, sodium chloride electrolyte solution, and an inorganic thickener (bentonite or attapulgite) in a specific mass ratio. By controlling the thickener content, the slurry viscosity is effectively increased by 1-3 orders of magnitude, significantly improving electrode particle settling, increasing the medium flow velocity region, reducing the dead zone area, and enhancing system stability and circulation performance. Experimental results show that by optimizing the electrode system with the addition of a thickener, a significant improvement in desalination performance is achieved, with the desalination rate reaching 1.84 μmol·cm under optimal conditions. ‑2 ·min ‑1 The current efficiency is as high as 93%. This invention has stable desalination performance and strong operational reliability. It is suitable for stable operation scenarios in brackish water desalination treatment and has good practical application value.
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