2D metal−organic frameworks (MOFs) are promising 2D materials with a wide range of applications due to their unique physical and chemical properties. However, 2D MOFs are prone to stacking due to their ultrathin thickness, and the high-yield preparation method of 2D MOFs is highly demanded. In this work, a rapid and scalable method is novelistically presented to prepare 2D MOFs with highly colloidal stability and high yield through coordination modulation at room temperature. A well-ordered CuBDC-MBA nanosheet (BDC, 1,4-benzenedicarboxylic; MBA, 4-methoxybenzoic acid) fabricated by introducing MBA as a modulator exhibits extremely stable colloid suspension for 6 months and the yield of well-dispersed CuBDC-MBA is higher than 88.6%. As MBA successfully participates in synthetic coordination of CuBDC-MBA and is presumably installed on the edge of 2D MOFs with low MBA content due to anisotropic growth, CuBDC-MBA and CuBDC are similar with respect to nanosheet morphology, integrated crystal structure, and porosity. Moreover, well-dispersed CuBDC-MBA shows higher catalytic effectiveness for the cycloaddition reaction of CO 2 with 1.5 times higher yield than CuBDC. Thus, this method can provide a new idea based on coordination modulation to directly fabricate 2D MOFs with purposeful properties.

No abstract

No abstract

Two-dimensional metal-organic framework (2D MOF) nanosheet is becoming as an attractive type of 2D materials. And Post-synthetic modification (PSM) provides a powerful method to modify the structure of MOF without altering its crystal topology, which can generate functional MOFs not accessible from direct synthesis and improve the compatibility between MOFs and other components in MOF-based composite materials, especially in MOF/polymer composite. In this work, a facile method based on PSM of 2D MOF with polymers is conducted to prepare functional nanocomposite membrane. First, the amino-functioned 2D MOF nanosheet, CuBDC-NH2 (BDC-NH2 is 2-amino-1,4-benzenedicarboxylate), is prepared by a feasible and convenient method as the PSM precursors. Then CuBDC-NH2 nanosheet reacts with isocyanate-terminated polyurethane (PU) oligomer through PSM to obtain CuBDC-NH2/PU nanocomposite membrane. As-prepared nanocomposite membrane shows over 93.0% removal rate for dye removal, such as methylene blue, Rhodamine B and Eosin Y, which paves new ways for the application of 2D MOF by facilely fabrication of functional 2D MOF-based nanocomposite membrane through PSM.

No abstract