Controlled growth and composition of multivariate metal-organic frameworks-199 via a reaction-diffusion process

• 作者: Razan Issa Fayrouz Abou Ibrahim Mazen Al-Ghoul Mohamad Hmadeh
• 来源期刊: 纳米研究（英文版）
• 年，卷（期）: 2021,（2）
• 所属期刊栏目: Research Articles
• 页码范围: 423-431
• 页数: 9页
• 语种: 英文

摘要

In this paper,we exploit our prior successful synthesis of MOF-199 single crystals using the resction-diffusion framework (RDF),to synthesize multivariate metal-organic frameworks (MTV-MOFs) version with enhanced properties.The MTV-MOFs are synthesized by cresting defects within the MOF-199 crystal structure by integrating organic linkers entailing different functional groups.Accordingly,5-aminoisophthalic acid (NH2-BDC) and 5-hydroxyisophthalic acid (OH-BDC) are separately mixed with 1,3,5-benzenetricarboxylic acid (BTC) in three different starting ratios of X-BDC∶BTC (1∶3,1∶1) and 3∶1).The effects of this linker on the morphology of the synthesized MTV-MOFs,their thermal stability,and their surface area are investigated.The extent of the incorporation of the linkers in the framework is elucidated via 1H-NMR spectroscopy and it is shown that the incorporation varies as a function of the location along the tubular reactor,a characteristic of RDF.The enhanced properties of the synthesized MTV-MOFs are further demonstrated by measuring its adsorptive capability for methylene blue (MB) and rhodamine B (Rh B) in aqueous solution,and compared with that of the as-synthesized MOF-199.The kinetic and thermodynamic studies reveal that MTV-MOFs with the ratio of X-BDC∶BTC (1∶1) exhibit the best uptakes of MB (263 mg/g) for X =OH and Rh B (156 mg/g) for X =NH2.The adsorbents are also easily regenerated for three consecutive cycles without losing their efficiency.We finally demonstrate that MTV-MOFs can be designed to tune the dye removal selectivity and enhance the removal capacity of both MB and RhB in a binary aqueous solution of these dyes.