Table 2. List of the Sorption Based Unsaturated Awh Materials and Their Adsorption and Desorption Performance.
| type | material | ads. capacity (g g–1)a | des. capacity (g g–1)b | driving force | year | ref |
|---|---|---|---|---|---|---|
| MOF | MIL-160 | 0.39 (90% RH) | hydrogen bond | 2015 | (113) | |
| MOF cavity | ||||||
| Ni2Cl2BTDD | 1.1 (95% RH) | 0.1 (30 °C*) | hydrogen bond | 2019 | (114) | |
| MOF cavity | ||||||
| MOF-801 | 3.3 (40% RH) | 2.3 (65 °C) | hydrogen bond | 2018 | (115) | |
| MOF cavity | ||||||
| Cr-soc-MOF-1 | 1.9 (90% RH) | 0.1 (25 °C*) | hydrogen bond | 2018 | (116) | |
| MOF cavity | ||||||
| MOF-801 | 2.8 (20% RH) | 0.02 (35 °C*) | hydrogen bond | 2017 | (56) | |
| MOF cavity | ||||||
| Zr-fum-MOF | 2.75 (90% RH) | hydrogen bond | 2011 | (60) | ||
| MOF cavity | ||||||
| DUT-67 | 2.7 (90% RH) | 1.1 (25 °C*) | hydrogen bond | 2013 | (61) | |
| MOF cavity | ||||||
| Fe-Fc-HCPs, CaCl2 | 4.54 (80% RH) | 4.3 (55–63 °C) | electromagnetic attraction | 2021 | (66) | |
| hydrogen bond | ||||||
| MOF cavity | ||||||
| HCS, LiCl | 3.5 (80% RH) | 2.5 (73 °C) | electromagnetic attraction | 2020 | (78) | |
| MIL-100(Fe), silica gel | 0.7 (90% RH) | 0.53(−) | hydrogen bond | 2021 | (68) | |
| MOF cavity | ||||||
| UiO-66, T3C2, SA | 0.7 (80% RH) | 0.17 (70 °C) | hydrogen bond | 2021 | (69) | |
| MOF cavity | ||||||
| MIL-101(Cr), SA | 1.3 (90% RH) | 0.6 (95 °C) | hydrogen bond | 2021 | (70) | |
| MOF cavity | ||||||
| HICs and derivatives | MnO2 | 1.8 (80% RH) | 0.26 (49 °C) | electromagnetic attraction | 2020 | (73) |
| conc. gradient | ||||||
| CaCl2, GO | 5.4 (98% RH) | 3.89 (60 °C) | electromagnetic attraction | 2019 | (75) | |
| conc. gradient | ||||||
| LiCl, ACFF | 3.6 (90% RH) | 2.1 (80 °C) | electromagnetic attraction | 2021 | (117) | |
| conc. gradient | ||||||
| ILc | [EMIM][Ac] | 1.2 | 0.1 (70–90 °C) | electromagnetic attraction | 2019 | (88) |
| conc. gradient | ||||||
| SiO2, TFSI, Si–P8 | 0.25 | electromagnetic attraction | 2019 | (118) | ||
| conc. gradient | ||||||
| function customized hydrogel | NIPAM, CNT, CaCl2 | 1.75 (80% RH) | 1.51 (75 °C) | conc. gradient | 2018 | (103) |
| electromagnetic attraction | ||||||
| photothermal | ||||||
| Zn acetate, ethanolamine | 3.7 (90% RH) | 3.45 (55 °C) | conc. gradient | 2019 | (119) | |
| photothermal | ||||||
| NIPAM, MIL-101Cr | 3.5 (90% RH) | 3.2 (61 °C) | conc. gradient | 2020 | (120) | |
| MOF cavity | ||||||
| photothermal | ||||||
| NIPAM, PPy-Cl | 6.2 (90% RH) | 5.9 (63 °C) | conc. gradient | 2019 | (112) | |
| photothermal | ||||||
| alginate, CaCl2, LiCl | 5.6 (70% RH) | 5.3 (72–75 °C) | electromagnetic attraction | 2020 | (97) | |
| conc. gradient | ||||||
| external energy | ||||||
| alginate, CaCl2 | 0.8 (25% RH) | 0.72 (100 °C) | electromagnetic attraction | 2018 | (99) | |
| conc. gradient | ||||||
| external energy | ||||||
| B5AMA | 0.51(−) | 0.44 (37 °C) | conc. gradient | 2018 | (101) | |
| external energy | ||||||
| AEtMA, acetate | 1 (85% RH) | 0.9 (70 °C) | conc. gradient | 2021 | (102) | |
| photothermal | ||||||
| AAm, PPy, dopamine | 1.54 (90% RH) | 1.33 (58 °C) | conc. gradient | 2020 | (98) | |
| photothermal | ||||||
| PDMAP, LiCl | 0.6 (30% RH) | 0.5 (80 °C) | conc. gradient | 2022 | (105) | |
| zwitterionic attraction |
a
The reported relevant humidity is shown in parentheses.
b
The desorption temperature is shown in parentheses.
c
The value of desorption temperature with marked with an asterisk is obtained from adsorption–desorption isotherms, it is the experimental condition, and may not the temperature at which practical water release is triggered.