文献类型：期刊文献

英文题名：Prolonged HKUST-1 functionality under extreme hydrothermal conditions by electrospinning polystyrene fibers as a new coating method

作者：Armstrong, Mitchell[1];Sirous, Peyman[1];Shan, Bohan[1];Wang, Ruitong[2];Zhong, Congwei[2];Liu, Jichang[2];Mu, Bin[1]

机构：[1]Arizona State Univ, Sch Engn Matter Transports & Energy, Chem Engn, 501 East Tyler Mall, Tempe, AZ 85287 USA;[2]East China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2018

卷号：270

起止页码：34

外文期刊名：MICROPOROUS AND MESOPOROUS MATERIALS

收录：;EI(收录号：20182005189587);WOS:【SCI-EXPANDED(收录号:WOS:000440529000005)】；

基金：This research work was financially supported by Arizona State University and the National Science Foundation (Grant Number CBET-1748641). The authors gratefully acknowledge the use of the Leroy Eyring Center for Solid State Science at Arizona State University. Financial support by the National Natural Science Foundation of China (Project 21476082) is gratefully acknowledged.

语种：英文

外文关键词：Metal-organic-frameworks (MOFs); Electrospinning; Water stability; HKUST-1; Core-shell adsorbents

摘要：The metal-organic framework (MOF) HKUST-1 (CuBTC) has been regarded as a promising adsorbent due to its open metal sites, easy synthesis method, and lower synthesis cost. However, a big challenge related to its practical application is its poor hydrostability. The porosity of as-synthesized HKUST-lpowder may drop 50% in less than one month and it can decompose within days at high humid and hot atmosphere. In this work, we demonstrate that the hydrothermal stability of HKUST-1 is greatly improved after coating it with a thin hydrophobic polymer. The HKUST-1 particles may be directly impregnated in polystyrene fibers during the electrospinning process by suspending sonochemically synthesized HKUST-1 powder in the polystyrene dope solution. It was confirmed that the final HKUST-1 loading was 5% by TGA. Nitrogen isotherms do not show the expected nitrogen uptake in these fibers; however, the carbon dioxide isotherms do. This suggests that the particles are embedded under a layer of polystyrene in agreement with SEM images, and that the nitrogen is unable to penetrate this layer over the length of a nitrogen adsorption experiment. HKUST-1 powder and 5 wt% HKUST-1 fibers are exposed to extreme hydrothermal conditions, and CO2 uptake is measured at varying time steps. Nearly complete hydrolytic degradation of pure HKUST-1 powder is observed at 6 h, but the rate of degradation in the 5 wt% HKUST-1 impregnated fibers is slowed, and 20% CO2 uptake capacity is still observed at 48 h.