Efficient Recognition and Removal of Persistent Organic Pollutants by a Bifunctional Molecular Material

Abstract

Persistent organic pollutants (POPs) exist widely in the environment and place significant impact on human health by bioaccumulation. Efficient recognition of POPs and their removal are highly challenging tasks because their specific structures interact often very weakly with the capture materials. Herein, a molecular nanocage ( 1) is studied as an efficient sensing and sorbent material for POPs, which is demonstrated by a representative and stable perfluorooctane sulfonate (PFOS) substrate containing a hydrophilic sulfonic group and a hydrophobic fluoroalkyl chain. A highly sensitive and unusual turn-on fluorescence response within 10 s and a 97% total removal of PFOS from water in 20 min have been achieved owing to the strong host−guest interactions between 1 and PFOS. The binding constant of 1 to PFOS is 2 orders of magnitude higher than state-of-the-art adsorbents for PFOS and thus represents a new benchmark material for the recognition and removal of PFOS. The host−guest interaction has been elucidated by solid-state NMR spectroscopy and single-crystal X-ray diffraction, which provide key insights at a molecular level for the design of new advanced sensing/sorbent materials for POPs.

Tactile Sensors: Hydroxyl Decorated Silver Metal–Organic Frameworks for Detecting Cr2O72–, MnO4–, Humic Acid, and Fe3+ Ions

“…Here, the designed MOFs acted as a fast and rapid sensor for Cr 2 O 7 2– , MnO 4 – , HA, and Fe 3+ ions with a response time of 1 min, and after that, only minor changes in fluorescence spectra were observed (Figures S34–S37). , Moreover, Ag-MOFs were performed for sample analysis with biological media analytes such as creatine, creatinine, glucose, uric acid, and urea. , These added analytes exhibited negligible effects on the fluorescence emission intensity of Ag-MOF1 water suspension with Fe 3+ ions (Figure S38). In addition, the spiking method with different concentrations for Cr 2 O 7 2– , MnO 4 – , HA, and Fe 3+ ions analytes was also performed in the analysis (Tables S9–S12).…”

“…46,47 Moreover, Ag-MOFs were performed for sample analysis with biological media analytes such as creatine, creatinine, glucose, uric acid, and urea. 48,49 These added analytes exhibited negligible effects on the fluorescence emission intensity of Ag-MOF1 water suspension with Fe 3+ ions (Figure S38). In addition, the spiking method with different concentrations for Cr 2 O 7 2− , MnO 4 − , HA, and Fe 3+ ions analytes was also performed in the analysis (Tables S9−S12).…”

Stable Europium(III) Metal–Organic Framework Demonstrating High Proton Conductivity and Fluorescence Detection of Tetracyclines

“…Note that the H 2 L 4− linker has two different coordination modes (Figure 1b). In mode I, the carboxyl groups show chelating and bridging μ 2 -η 1 :η, 1 and chelating μ 1 -η 1 :η 1 coordination modes, while for mode II, the carboxyl groups only show chelating μ 1 -η 1 :η 1 coordination mode. The topological analysis for Eu-MOF has been performed using TOPOS 4.0 38 by considering both 8-connected SBU and two 1d).…”

A turn-on fluorescent Zn(ii) metal–organic framework sensor for quantitative anthrax biomarker detection

“…Because of their intrinsic characteristics and superior physical performance, MOFs with structural versatility and functional tunability offer the opportunity to construct abundant aesthetic structures and introduce prospective functionalities. [8][9][10] Up to now, MOFs have shown superior physical performance in various fields, such as gas adsorption and separation, [11][12][13][14][15][16] biological imaging, [17][18][19] heterogeneous catalysis, [20][21][22] luminescence and other fields with great potential. [23][24][25][26][27][28][29][30][31] In particular, the application of MOFs as sensing materials is one of their most important applications.…”