Installation of synergistic binding sites onto porous organic polymers for efficient removal of perfluorooctanoic acid

Abstract

Herein, we report a strategy to construct highly efficient perfluorooctanoic acid (PFOA) adsorbents by installing synergistic electrostatic/hydrophobic sites onto porous organic polymers (POPs). The constructed model material of PAF-1-NDMB (NDMB = N,N-dimethyl-butylamine) demonstrates an exceptionally high PFOA uptake capacity over 2000 mg g−1, which is 14.8 times enhancement compared with its parent material of PAF-1. And it is 32.0 and 24.1 times higher than benchmark materials of DFB-CDP (β-cyclodextrin (β-CD)-based polymer network) and activated carbon under the same conditions. Furthermore, PAF-1-NDMB exhibits the highest k2 value of 24,000 g mg−1 h−1 among all reported PFOA sorbents. And it can remove 99.99% PFOA from 1000 ppb to <70 ppt within 2 min, which is lower than the advisory level of Environmental Protection Agency of United States. This work thus not only provides a generic approach for constructing PFOA adsorbents, but also develops POPs as a platform for PFOA capture.

Tuning Metal–Organic Framework (MOF) Topology by Regulating Ligand and Secondary Building Unit (SBU) Geometry: Structures Built on 8-Connected M6 (M = Zr, Y) Clusters and a Flexible Tetracarboxylate for Propane-Selective Propane/Propylene Separation

“…The intriguing features of MOFs lie primarily in their great promise for various applications as well as unprecedented, rich chemistry. The potential applications of MOFs have spread from gas storage/separation, − catalysis, , to food preservation, , and environmental protection. − Endeavors are being made for the industrial implementation of MOFs in related fields . On the other hand, the structure diversity, framework flexibility, tunable pore structure, and functionality of MOFs have brought exciting chemistry findings. , …”

Triazine- and Heptazine-Based Porous Organic Polymer Networks for the Efficient Removal of Perfluorooctanoic Acid

“…Both adsorbents exhibited fast adsorption kinetics common for adsorption processes facilitated by electrostatic interactions, with the maximum adsorption achieved in less than 1 h. While this treatment time is promising for efficient PFOA removal, POPs have been reported that can achieve 99.99% removal in 2 min. 46 Nonetheless, our synthesis is advantageous as it can facilitate future performance improvements through surface tuning. PFOA adsorption via both POPs showed pseudosecond-order kinetics (SI, eq 6).…”

Annealed Covalent Organic Framework Thin Films for Exceptional Absorption of Ultrabroad Low‐Frequency Electromagnetic Waves

“…[ 4 ] Distinct from traditional polymers, covalent organic frameworks (COFs) are a class of crystalline porous polymer with ordered networks and inherent pores. [ 9–11 ] Despite fascinating features of low density, broad diversity, and high designability, [ 12–19 ] the potential of COFs for low‐frequency electromagnetic wave absorption is unprecedented.…”

“…[1] Such materials need to eliminate surface reflection, allow a full entry of low-frequency electromagnetic wave, and dissipate wave energies in their thin films or coatings via magnetic, dielectric, and conductive loss. [1][2][3][4][5] Magnetic loss is based on ferromagnetic materials such designability, [12][13][14][15][16][17][18][19] the potential of COFs for low-frequency electromagnetic wave absorption is unprecedented.…”