Regeneration‐Optimized Chemisorbents: Evaluating Hybrid Coordination Networks for Atmospheric Water Harvesting
4 affiliations
- 1Bernal Institute and Department of Chemical Sciences University of Limerick Limerick Ireland
- 2Department of Chemical Engineering College of Materials Science and Engineering Beijing University of Technology Beijing China
- 3Department of Chemistry North Carolina State University Raleigh North Carolina USA
- 4Department of Inorganic Chemistry Technische Universitat Dresden Dresden Germany
Abstract
Atmospheric water harvesting (AWH) can be enabled by solid desiccants that exhibit S‐shaped adsorption isotherms with one or more steps at low relative humidity (RH, <30%) and mild regeneration temperatures (<60°C). There remains a dearth of such regeneration‐optimized sorbents (ROSs), which thus far are limited exclusively to physisorbents mainly because chemisorbents typically require elevated temperatures for water recovery. Herein, the first comprehensive water sorption study of the SIFSIX‐3‐Ni family of hybrid coordination networks (HCNs) and a new, related family of HCNs, reveals a shared cooperative chemisorption mechanism with markedly different RH thresholds and regeneration requirements. Whereas the SIFSIX‐3‐Ni family operates outside the RH and regeneration limits of ROSs, four M′FSIX‐25‐M analogues (M = Co2+, Ni2+; M' = Si4+, Ti4+, 25 = 1,4‐bis(imidazol‐1‐yl)naphthalene) exhibit both low‐RH chemisorption and regeneration from 34‐44°C. The lead regeneration optimized chemisorbent, ROC‐1 (TIFSIX‐25‐Ni), has a projected water‐harvesting productivity of ca. 3.5 kgH2O Lsorbent −1 d−1. Density functional theory calculations provide insight into the energetics and mechanism of hydration/dehydration in these first‐generation ROCs. This work establishes ROCs as a new class of desiccants that offers reversible chemisorption within the low‐RH and mild‐regeneration conditions relevant to AWH in arid environments.
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BibTeX
@article{kong2026regenerationoptimized,
title = {{Regeneration‐Optimized Chemisorbents: Evaluating Hybrid Coordination Networks for Atmospheric Water Harvesting}},
author = {Xiang‐Jing Kong and Asif Raza and Lilia Croitor and Andrey Bezrukov and Xia Li and Angela Shipman and William Morris and Carlos J. Solanilla‐Salinas and Adam Hogan and Brian Space and Volodymyr Bon and Stefan Kaskel and Soumya Mukherjee and Alan C. Eaby and Tao He and Michael J. Zaworotko},
journal = {Angewandte Chemie (International Ed. in English)},
year = {2026},
month = sep,
doi = {10.1002/anie.6095254},
url = {https://doi.org/10.1002/anie.6095254},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Regeneration‐Optimized Chemisorbents: Evaluating Hybrid Coordination Networks for Atmospheric Water Harvesting
AU - Xiang‐Jing Kong
AU - Asif Raza
AU - Lilia Croitor
AU - Andrey Bezrukov
AU - Xia Li
AU - Angela Shipman
AU - William Morris
AU - Carlos J. Solanilla‐Salinas
AU - Adam Hogan
AU - Brian Space
AU - Volodymyr Bon
AU - Stefan Kaskel
AU - Soumya Mukherjee
AU - Alan C. Eaby
AU - Tao He
AU - Michael J. Zaworotko
PY - 2026
DA - 2026/09/21
JO - Angewandte Chemie (International Ed. in English)
DO - 10.1002/anie.6095254
UR - https://doi.org/10.1002/anie.6095254
AB - Atmospheric water harvesting (AWH) can be enabled by solid desiccants that exhibit S‐shaped adsorption isotherms with one or more steps at low relative humidity (RH, <30%) and mild regeneration temperatures (<60°C). There remains a dearth of such regeneration‐optimized sorbents (ROSs), which thus far are limited exclusively to physisorbents mainly because chemisorbents typically require elevated temperatures for water recovery. Herein, the first comprehensive water sorption study of the SIFSIX‐3‐Ni family of hybrid coordination networks (HCNs) and a new, related family of HCNs, reveals a shared cooperative chemisorption mechanism with markedly different RH thresholds and regeneration requirements. Whereas the SIFSIX‐3‐Ni family operates outside the RH and regeneration limits of ROSs, four M′FSIX‐25‐M analogues (M = Co2+, Ni2+; M' = Si4+, Ti4+, 25 = 1,4‐bis(imidazol‐1‐yl)naphthalene) exhibit both low‐RH chemisorption and regeneration from 34‐44°C. The lead regeneration optimized chemisorbent, ROC‐1 (TIFSIX‐25‐Ni), has a projected water‐harvesting productivity of ca. 3.5 kgH2O Lsorbent −1 d−1. Density functional theory calculations provide insight into the energetics and mechanism of hydration/dehydration in these first‐generation ROCs. This work establishes ROCs as a new class of desiccants that offers reversible chemisorption within the low‐RH and mild‐regeneration conditions relevant to AWH in arid environments.
SN - 1433-7851
SN - 1521-3773
ER -