Hybrid salt-enriched micro-sorbents for atmospheric water sorption

Samar N. Abd Elwadood, K. Suresh Kumar Reddy, Yasser Al Wahedi, Ali Al Alili, Andreia S.F. Farinha, Geert Jan Witkamp, Ludovic F. Dumée, Georgios N. Karanikolos*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Water shortage severely impacts drought-stricken regions, with estimates indicating that almost half a billion people are affected yearly. Composites of Salt and Porous Matrix (CSPMs) are promising functional materials for water vapor sorption. Here, CSPMs were synthesized by loading SAPO-34 porous crystals with highly hygroscopic salts, namely LiCl and CaCl2, individually (mono-salt systems) or combined (binary salt systems) to enhance water sorption capacity and cyclability. The LiCl and CaCl2 content in the impregnation solution impacted the sorption behavior and equilibrium capacity of the resulting composites. Physicochemical, morphological, textural, and sorption properties were evaluated showing that the confinement of binary salts yielded the highest water uptake (0.88 gw/gads at 25 °C and 90 % RH), which was four times higher than that of the parent SAPO-34. The shape of the obtained water vapor isotherms revealed that the salts introduced into the porous structure led to significant changes in the sorption mechanism, with SAPO-34 following a Langmuir behavior (type I isotherm) and the composites a type II isotherm with associated multilayer formation due to the presence of the salts. Kinetic studies also revealed that the materials follow a PSO model dominated by water-surface interactions. Embedding different salts into the same hosting pores to support atmospheric water harvesting was therefore found to enhance capacity and cyclability compared to single inorganic porous structures toward more efficient water sorption processes.

Original languageEnglish (US)
Article number103560
JournalJournal of Water Process Engineering
Volume52
DOIs
StatePublished - Apr 2023

Bibliographical note

Funding Information:
Financial support by the Center for Catalysis and Separations (CeCaS, RC2-2018-024 ) of Khalifa University is greatly acknowledged. Support by the Center of Membranes and Advanced Water Technology (CMAT, RC2-2018-009 ) and the Research and Innovation Center on CO 2 and Hydrogen (RICH, RC2-2019-007 ) of Khalifa University is gratefully acknowledged. In addition, this work was supported by the Abu Dhabi National Oil Company (ADNOC), Emirates NBD and Sharjah Electricity Water & Gas Authority (SEWA) as the sponsors of the 3rd Forum for Women in Research , QUWA: Women Empowerment for Global Impact at University of Sharjah .

Funding Information:
Financial support by the Center for Catalysis and Separations (CeCaS, RC2-2018-024) of Khalifa University is greatly acknowledged. Support by the Center of Membranes and Advanced Water Technology (CMAT, RC2-2018-009) and the Research and Innovation Center on CO2 and Hydrogen (RICH, RC2-2019-007) of Khalifa University is gratefully acknowledged. In addition, this work was supported by the Abu Dhabi National Oil Company (ADNOC), Emirates NBD and Sharjah Electricity Water & Gas Authority (SEWA) as the sponsors of the 3rd Forum for Women in Research, QUWA: Women Empowerment for Global Impact at University of Sharjah.

Publisher Copyright:
© 2023 Elsevier Ltd

Keywords

  • AlPOs
  • Atmospheric water generation
  • Composites of salt and porous matrix
  • Porous materials
  • Sorption

ASJC Scopus subject areas

  • Biotechnology
  • Safety, Risk, Reliability and Quality
  • Waste Management and Disposal
  • Process Chemistry and Technology

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