However, these adsorbents have obvious drawbacks in balancing the adsorption capacity and desorption conditions because of too weak or too strong hydrophilicity. [21] Therefore, it is necessary to develop novel porous functional materials with efficient water capture and release performance from atmosphere.Metal-organic frameworks (MOFs) have emerged as a class of porous materials by self-assembly of inorganic metal clusters and organic linkers. They have high porosities and internal surface areas, as well as diversity in chemistry and structure. [24] As a result of these attractive features, MOFs are promising candidates to capture water. Recently, there is a growing interest to search novel MOFs to achieve high water uptakes. [22,25] For example, at the low relative humidity relating to water harvesting in the desert, Yaghi et al. demonstrated that substantial progress has been made in some materials, such as MOF-801, [26] and MOF-303. [27,28] At the high relative humidity, Zhao et al. utilized PNIPAM@MIL-101(Cr) to obtain high water adsorption (RH = 96%, 440 wt%). [16] In the range of test pressure, the high water adsorption capacity is mainly attributed to the specific surface area and pore volume of MOF. For instance, the water adsorption capacity of Cr-soc-MOF-1 is almost 200 wt% due to the specific surface area of 4590 m 2 g −1 and pore volume of 2.1 cm 3 g −1 , while further improvement of uptake is hindered by the limitation of pore volume. [29] Meanwhile, the release of adsorbed water is important from the practical point of view. [15] Considering the preferred low-grade waste heat sources or even low-cost solar resources, the ideal condition is that the desorption temperature should be lower than 323 K. [30][31][32] Unfortunately, the reported regeneration temperatures of most MOF materials are higher than expected. To address these challenges, developing solid-liquid hostguest composites (SLHGCs) may be a possible solution. It uses solid as the main material and functional liquid as the guest one. Porous solid material can provide limited space and strong capillary force for carrying functional liquid. [33] As a kind of functional liquid, ionic liquids (ILs) are rich in polar groups and adsorption sites, [34,35] and nano-confined ILs by loading ILs into porous materials can be a versatile strategy to prepare composites with a combination of their favorable characteristics. The impregnation of ILs inside the Water adsorption based on porous materials is of fundamental importance in atmospheric water harvesting and dehumidification. Herein, a [BOHmim] [Zn 2 Cl 5 ]@MIL-101(Cr) composite with multiple adsorption sites is designed to enhance the water adsorption capacity. It is interesting to observe that there is a water-responsive confinement-unconfinement transformation of ionic liquids (ILs) during the water adsorption and release process. Thus, it can simultaneously overcome the limitation of pore volume in traditional porous materials, and the problem of mass transfer in pure ILs. As a result, the ob...

Due to its toxicity and corrosiveness, it is of enormous significance to efficiently capture and recover sulfur dioxide (SO2) from flue gas and natural gas. Herein, a new type of IL/MIL‐0.7 composite was precisely designed to meet this challenge, which exhibits a high adsorption capacity for SO2 (13.17 mmol g−1) at 298 K and 1.0 bar while excludes almost completely carbon dioxide (CO2, 0.27 mmol g−1) and nitrogen (N2, 0.07 mmol g−1). The high IAST selectivity (at least 11,925) of IL/MIL‐0.7 for SO2/CO2 can be achieved within the whole test pressure range. In addition, the breakthrough experiment also confirmed the excellent performance of the composite for deep removal of 2000 ppm SO2. Furthermore, the IL/MIL‐0.7 composites can maintain excellent performance after four adsorption/desorption cycles and the thermostability can up to ~450 K. Therefore, this stable IL/MOF composite has the potential application as an effective adsorbent for SO2 removal from flue gas and natural gas.

Due to its toxicity and corrosiveness, it is of enormous significance to efficiently capture and recover sulfur dioxide (SO2) from flue gas and natural gas. Herein, a new type of IL/MIL-0.7 composite was precisely designed to meet this challenge, which exhibits a high adsorption capacity for SO2 (13.17 mmol·g-1) at 298 K and 1 bar while excludes almost completely carbon dioxide (CO2) (0.27 mmol·g-1) and nitrogen (N2) (0.07 mmol·g-1). The high IAST selectivity (at least 11925) of IL/MIL-0.7 for SO2/CO2 can be achieved within the whole test pressure range. In addition, the breakthrough experiment also confirmed the excellent performance of the composite for deep removal of 2000 ppm SO2. Furthermore, the IL/MIL-0.7 composites can maintain excellent performance after four adsorption and desorption circulations and the thermostability can up to ~450 K. Therefore, this stable IL@MOF composite has the potential application as an effective adsorbent for SO2 removal from flue gas.