Electrode for selective bromide removal in membrane capacitive deionisation.

Area of Science:

• Environmental Science
• Materials Science
• Water Treatment Technologies

Background:

• Global freshwater scarcity necessitates increased reliance on seawater desalination.
• Seawater contains high bromide levels, leading to harmful disinfection by-products.
• Conventional two-pass reverse osmosis (RO) for bromide removal is costly.

Purpose of the Study:

• To develop a bromide-selective composite electrode for membrane capacitive deionisation (MCDI).
• To evaluate the performance of the novel electrode against conventional carbon electrodes for bromide removal.

Main Methods:

• Fabrication of a composite electrode by coating activated carbon with bromide-selective resin and anion exchange polymer.
• Performance comparison of the composite electrode with a conventional carbon electrode in MCDI.
• Assessment of bromide selectivity and removal efficiency.

Main Results:

• The developed composite electrode exhibited ten times greater bromide selectivity compared to conventional carbon electrodes.
• Demonstrated the potential of MCDI for targeted ion removal from water sources.
• Indicated feasibility of resource recovery via electrode modification.

Conclusions:

• The bromide-selective composite electrode is a promising advancement for efficient bromide removal in water treatment.
• MCDI with modified electrodes offers a potentially more cost-effective alternative to traditional methods.
• This technology holds potential for selective ion removal and resource recovery applications.