Luo Tian-Yi, Park Sunghwan, Chen Tso-Hsuan, Patel Roshan, Li Xinyu, Ilja Siepmann J, Caratzoulas Stavros, Xia Zhiyong, Tsapatsis Michael
Department of Chemical and Biomolecular Engineering & Institute for NanoBioTechnology, Johns Hopkins University, 3400N. Charles Street, Baltimore, MD 21218, USA.
School of Nano & Materials Science and Engineering, Kyungpook National University, 2559 Gyeongsang-daero, Sangju-si, Gyeongsangbuk-do, 37224, Republic of Korea.
Angew Chem Int Ed Engl. 2022 Nov 2;61(44):e202209034. doi: 10.1002/anie.202209034. Epub 2022 Sep 30.
With increasing demands for high-performance water sorption materials, metal-organic frameworks (MOFs) have gained considerable attention due to their high maximum uptake capacities. In many cases, however, high overall capacity is not necessarily accomplishing high working capacity under operating conditions, due to insufficient hydrophilicity and/or water stability. Herein, we present a post-synthetic modification (PSM) of MOF-808, with di-sulfonic acids enhancing simultaneously its hydrophilicity and water stability without sacrificing its uptake capacity of ≈30 mmol g . Di-sulfonic acid PSM enabled a shift of the relative humidity (RH) associated with a sharp step in water vapor sorption from 35-40 % RH in MOF-808 to below 25 % RH. While MOF-808 lost uptake capacity and crystallinity over multiple sorption/desorption cycles, the di-sulfonic acid PSM MOF-808 retained >80 % of the original capacity. PSM MOF-808 exhibited good hydrothermal stability up to 60 °C and high swing capacity.
随着对高性能吸水材料需求的增加，金属有机框架材料（MOFs）因其高最大吸附容量而备受关注。然而，在许多情况下，由于亲水性不足和/或水稳定性不够，高的总吸附量在操作条件下不一定能实现高的工作吸附量。在此，我们报道了对MOF-808进行的后合成修饰（PSM），用二磺酸同时增强其亲水性和水稳定性，而不牺牲其约30 mmol g的吸附容量。二磺酸PSM使水蒸气吸附中与急剧变化相关的相对湿度（RH）从MOF-808中的35 - 40% RH转变至低于25% RH。虽然MOF-808在多个吸附/解吸循环后失去了吸附容量和结晶度，但二磺酸PSM修饰的MOF-808保留了超过80%的原始容量。PSM修饰的MOF-808在高达60°C时表现出良好的水热稳定性和高的变容吸附量。
