Brackish water

Engineering

Materials science

Capacitive deionization

Biochemistry

Salinity

Chemical engineering

Nitrogen

Geology

Oceanography

Waste management

Organic chemistry

Membrane

Desalination

Environmental science

Chemistry

Chemical Engineering Journal

Capacitive deionization (CDI) has emerged as a promising way to obtain freshwater from saline water, but its implementation is in its infancy and remains challenging due to the low salt adsorption capacity (SAC) of commonly used activated carbons (ACs). It is thus desirable to develop carbon electrodes that can exceed the performance of ACs benchmarks. In this work, nitrogen-doped mesostructured carbon nanocrystals (NMCs) have been developed by direct carbonization of highly ordered mesostructured polymers. Due to their mesoporous structure, high N content and large surface area, NMCs exhibit a maximum SAC of 20.63 mg g−1. This state-of-the-art carbon electrode largely surpasses common ACs. This work demonstrates the significance of the material synthetic chemistry and the importance of nanostructuring carbon materials for CDI applications.

Capacitive deionization using nitrogen-doped mesostructured carbons for highly efficient brackish water desalination