Atmospheric water harvesting (AWH) technology offers a sustainable and innovative solution to address water scarcity in arid and remote regions, with its performance primarily dependent on the water adsorption capacity and kinetics of the adsorbent materials. However, conventional materials still face efficiency limitations under high-humidity conditions. Inspired by the unique hump structure of spider silk, this work innovatively develops bioinspired porous nanofibril-humped fibers (BPNF) through a green synthesis approach. The hierarchical porous architecture is constructed via radical polymerization and aqueous-phase in situ growth of MOF-303, eliminating the need for toxic reagents, while microfluidic spinning enables bionic hump structuring with minimal energy consumption. By integrating micro/nanochannels and hydrophilic surface modifications, the material achieves synergistic optimization of low diffusion resistance and high water harvest efficiency. MOF-303 is completed through in-situ hydrothermal growth and ensures the environmental friendliness of the synthesis process. Experimental results demonstrates that the BPNF achieves a remarkable water harvesting rate of 1.63 g cm −2 h −1 at 90–100 % RH, outperforming conventional materials by 2.3 times, with a 62 % reduction in carbon footprint. This work establishes a new paradigm for designing high-efficiency, sustainable AWH materials, combining biomimetic structural engineering with green manufacturing principles. This study provides insight into the design of novel AWH materials, which can be extended to some practical applications, e.g., water engineering in industry or agriculture systems.
Adsorption-based separation of 2-phenylethanol (2-PE) and 1-phenylethanol (1-PE) is crucial yet challenging in the petrochemical industry. In this study, we report that an ultra-micropore aluminum-based metal–organic framework (Al-MOF) (i.e., CAU-23) exhibits higher 2-PE/1-PE selectivity (6.12) and 2-PE adsorption capacity (2.52 mmol g −1 ) in liquid phase compared to its pseudo-isostructural analogue of Al-MOFs, MIL-160 and MOF-303 at 293 K. The micropore diffusion model was employed to give the best fit to the adsorption kinetics of the CAU-23 with a rate achieved higher than MIL-160 and MOF-303. Computational analysis confirmed that 2-PE preferential adsorption stems from CAU-23′s well-matched pore geometry which enables efficient molecular confinement. In combination of inspecting the static adsorption properties of 2-PE and 1-PE onto CAU-23, we found that the superior affinity of CAU-23 toward 2-PE over 1-PE originates from entropy and enthalpy effect. The remarkable 2-PE/1-PE separation capability of CAU-23 was confirmed through breakthrough curve analysis (separation factor ≈ 4). As the first Al-MOF developed for 2-PE/1-PE separation, CAU-23 offers valuable insights into the design of advanced 2-PE-selective adsorbents.
Fan Luo,Xianghui Liang,Weicheng Chen,Shuangfeng Wang,Xuenong Gao,Zhengguo Zhang,Yutang Fang
MOF-based atmospheric water harvesting technology is a straightforward and practical strategy for producing safe drinking water . However, separate designs of high-adsorption desiccant skeletons and efficient photothermal layers are required to maximize water production efficiency. This work presents an integrated design of a multifunctional monolithic adsorbent through the layer-by-layer assembly of chitosan/polydopamine layers and hybridized MOF backbones on a glass fiber support. The hydrophilic hybridized MOF consisting of MIL-160(Al) and MOF-303 obtains the higher specific surface area (917.59 m 2 /g) and pore volume (0.44 cm 3 /g) through morphological reorganization for facilitating water capture and storage capacity. Especially in arid environments (RH ≤ 30 %), the resultant MOF has a superior moisture adsorption capacity (0.44 g/g) than parental MOF and other potential MOFs. The polymeric photothermal layer of adsorbent enables high solar thermal conversion in sunlight to assist the release of collected water. With fast sorption–desorption kinetics, an impressive outdoor water production of 0.94 g/g per day is observed in the designed monolithic adsorbent, indicating its enormous potential for safe, sustainable and scalable atmospheric water collection technology.
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