High Water Adsorption MOFs with Optimized Pore‐Nanospaces for Autonomous Indoor Humidity Control and Pollutants Removal

• Published in: Angewandte Chemie International Edition Vol. 61; no. 4; pp. e202112097 - n/a
• Main Authors: Zhu, Neng‐Xiu, Wei, Zhang‐Wen, Chen, Cheng‐Xia, Xiong, Xiao‐Hong, Xiong, Yang‐Yang, Zeng, Zheng, Wang, Wei, Jiang, Ji‐Jun, Fan, Ya‐Nan, Su, Cheng‐Yong
• Format: Journal Article
• Language: English
• Published: Germany Wiley Subscription Services, Inc 21.01.2022
• Edition: International ed. in English
• Subjects: Adsorbed water; Adsorption; Air Pollution, Indoor; Air quality; Contaminants; Control stability; Dehumidification; Gels; Health risks; high water-stable MOFs; Humidity; Humidity control; Hydrophilicity; Hydrophobicity; Indoor air pollution; indoor air purification; Indoor air quality; Indoor environments; indoor humidity control; Metal-organic frameworks; Metal-Organic Frameworks - chemistry; MOF pore-nanospace engineering; Moisture control; Molecular Structure; Nanoparticles - chemistry; Optimization; Particle Size; Pollutant removal; Pollutants; Pollution control; Recyclability; Regeneration; Relative humidity; Silica; Silicon dioxide; Surface Properties; Water - chemistry; Water Pollutants, Chemical - chemistry; Water Pollutants, Chemical - isolation & purification; Water purification; water-adsorption based applications; Work capacity; Zeolites; indoor air purification; MOF pore-nanospace engineering; high water-stable MOFs; indoor humidity control; water-adsorption based applications
• ISSN: 1433-7851; 1521-3773; 1521-3773
• DOI: 10.1002/anie.202112097

The indoor air quality is of prime importance for human daily life and health, for which the adsorbents like zeolites and silica‐gels are widely used for air dehumidification and harmful gases capture. Herein, we develop a pore‐nanospace post‐engineering strategy to optimize the hydrophilicity, water‐uptake capacity and air‐purifying ability of metal‐organic frameworks (MOFs) with long‐term stability, offering an ideal candidate with autonomous multi‐functionality of moisture control and pollutants sequestration. Through variant tuning of organic‐linkers carrying hydrophobic and hydrophilic groups in the pore‐nanospaces of prototypical UiO‐67, a moderately hydrophilic MOF (UiO‐67‐4Me‐NH2‐38 %) with high thermal, hydrolytic and acid‐base stability is screened out, featuring S‐shaped water sorption isotherms exactly located in the recommended comfortable and healthy ranges of relative humidity for indoor ventilation (45 %–65 % RH) and adverse health effects minimization (40–60 % RH). Its exceptional attributes of water‐uptake working capacity/efficiency, contaminants removal, recyclability and regeneration promise a great potential in confined indoor environment application. A moderately hydrophilic MOF of UiO‐67‐4Me‐NH2‐38 % with high thermal, hydrolytic and acid‐base stability has been obtained by a pore‐nanospace post‐engineering strategy, which shows ideal S‐shaped water‐sorption isotherm, high water‐uptake working capacity and efficiency in the ASHRAE recommended humidity range, and prior capture ability of harmful organic and inorganic vapors, providing a promising candidate for autonomous indoor humidity control and air purification.