Fabrication of ultrathin single-layer 2D metal–organic framework nanosheets with excellent adsorption performance via a facile exfoliation approach

Abstract

A single-layer of 2D metal–organic framework nanosheet was elaborately prepared by a facile exfoliation approach and showed unprecedented performance in removing congo red.

Recent advances on the removal of dyes from wastewater using various adsorbents: a critical review

“…Besides, larger surface areas, multi-functionality, polar/polarisable bonds, and the possibility of the presence of host-guest interactions through the chemical amendments of the organic ligands and/or the inorganic subunits are also likely to play a unique role. [250][251][252][253][254][255] According to Li et al, MIL-53(Al)-NH 2 could rapidly bind with MB (208.3 mg/g) and MG (164.9 mg/g) due to hydrogen bonding between amino groups of the dyes and MOF. Further, MIL-Ti MOFs aided with ultrasound adsorbed basic red 46, basic blue 41, and MB from single and binary systems exhibited their maximum adsorption capacity of 1250, 1428, and 833 mg/g, respectively.…”

A Review of Advancing Two-Dimensional Material Membranes for Ultrafast and Highly Selective Liquid Separation

“…It still remains a great challenge to achieve ultrathin 2D metal-organic frameworks nanosheets. Two strategies are mainly employed for synthesizing 2D MOF nanosheets: top-down [26] and bottom-up methods [27]. In the top-down strategy, Liu's group [26] prepared 2D nanosheets by weakening the interlayer van der Waals forces of the 3D layered MOF through intercalated H + ions and the electrostatic interaction of negatively charged congo red (CR) dye.…”

“…Two strategies are mainly employed for synthesizing 2D MOF nanosheets: top-down [26] and bottom-up methods [27]. In the top-down strategy, Liu's group [26] prepared 2D nanosheets by weakening the interlayer van der Waals forces of the 3D layered MOF through intercalated H + ions and the electrostatic interaction of negatively charged congo red (CR) dye. This exfoliation method yielded ultrathin monolayer (3.4 nm) 2D Zn-MOF nanosheets with extra-large lateral dimensions (~6 mm).…”

Current Progress and Scalable Approach toward the Synthesis of 2D Metal–Organic Frameworks

“…inserted H + ions between the interlayers of layered MOF{[Zn 2 (5‐OH‐BDC) 2 L 2 ] · 1.5H 2 O} n (Zn‐MOF; 5‐OH‐H 2 BDC = 5‐hydorxy‐1,3‐benzenedicarboxylic acid; L = (pyridine‐4‐yl) methyl 3‐(2‐(4‐((pyridine‐4‐yl)methoxy)phenyl)diazinyl)benzoate) by adjusting the solution pH to weaken hydrogen bonding. [ 47 ] Subsequent adsorption of the anionic dye congo red to the 2D Zn‐MOF surface prevented nanosheet restacking. This technique yielded monolayered nanosheets 3.4 nm thick with impressive lateral sizes reaching 6 μm.…”