Hydrothermal stability of water sorption ionogels

Hongsheng Dong, Ahmed Askalany, Christopher Olkis, Jiafei Zhao, Giulio Santori

Research output: Contribution to journalArticlepeer-review


Adsorption desalination and membrane distillation are the only thermally driven desalination technologies that can be undertaken at temperatures below 70°C. Adsorption desalination is based on an adsorber whose performance primarily depends on the properties of the water sorbent. Water sorption ionogel represents a novel class of materials offering a large working capacity for desalination. In this study, water-sorptive ionogels were prepared and their
hydrothermal stability was assessed. The results show that Syloid 72FP silica-based ionogels are hydrothermally stable. The ionic liquid EMIM Ac can be tightly confined in silica at amounts of up to 50 wt% and still withstand high relative humidity and temperature swings. Water uptake of the synthesized ionogel can be up to 1.64 gwater gionogel-1 at 90% RH, which is ~3 times of that of Syloid 72FP silica and ~4 times of that of activated carbon. The EMIM Ac/Syloid 72FP ionogel thus exhibits features appropriate for adsorption desalination systems.
Original languageEnglish
Article number116186
Early online date24 Sep 2019
Publication statusE-pub ahead of print - 24 Sep 2019


  • ionic liquid
  • silica
  • ionogel
  • adsorption desalination


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