Park Jinkyoung, Chae Yun Seok, Kang Dong Won, Kang Minjung, Choe Jong Hyeak, Kim Saemi, Kim Jee Yeon, Jeong Yong Won, Hong Chang Seop
Department of Chemistry, Korea University, Seoul 02841, Republic of Korea.
Samsung Research, Seoul 06765, Republic of Korea.
ACS Appl Mater Interfaces. 2021 Jun 2;13(21):25421-25427. doi: 10.1021/acsami.1c06089. Epub 2021 May 18.
Diamine-functionalized metal-organic frameworks (MOFs) are known as desirable adsorbents that can capture CO even at low pressures, but the humidity instability of bare MOF powders as well as their shaping have not yet adequately addressed for practical applications. Herein, we report an effective synthetic strategy for fabricating millimeter-sized MOF/poly(vinylidene fluoride) (PVDF) composite beads with different amounts of PVDF binders (30, 40, and 50 wt %) via a phase inversion method, followed by the postfunctionalization of 1-ethylpropane-1,3-diamine (epn). Compared with the pristine MOF powder, the diamine-grafted bead, epn-MOF/PVDF40, upon mixing with 40% binder polymers, exhibited a superior long-term performance without structural collapse for up to 1 month. The existence of the hydrophobic PVDF polymer in the composite material is responsible for such durability. This work provides a promising preparative route toward developing stable and shaped MOFs for the removal of indoor CO.
二胺功能化金属有机框架材料（MOFs）是一种理想的吸附剂，即使在低压下也能捕获一氧化碳，但裸MOF粉末的湿度不稳定性及其成型问题在实际应用中尚未得到充分解决。在此，我们报道了一种有效的合成策略，通过相转化法制备具有不同PVDF粘结剂含量（30%、40%和50%重量）的毫米级MOF/聚偏氟乙烯（PVDF）复合珠，随后进行1-乙基丙烷-1,3-二胺（epn）的后功能化。与原始MOF粉末相比，与40%粘结剂聚合物混合的二胺接枝珠epn-MOF/PVDF40在长达1个月的时间内表现出优异的长期性能，且结构无塌陷。复合材料中疏水性PVDF聚合物的存在是造成这种耐久性的原因。这项工作为开发用于去除室内一氧化碳的稳定且成型的MOFs提供了一条有前景的制备途径。
