Abstract:Zirconium Metal−Organic Framework materials (MOF, UiO-66 and UiO-67) have been used for the removal from aqueous solutions of persistent fluorinated pollutants, perfluorooctanoic acid (PFOA) and perfluorooctanesulfonic acid (PFOS). The two isostructural materials differ in cavity size, defined by the ligand, bdc (benzene-dicarboxylic acid) or bpdc (biphenyl-dicarboxylic acid) for UiO-66 and UiO-67 respectively. Both materials enable efficient sorption of both PFOA and PFOS. Sorption kinetics and isotherms have… Show more
“…5c ) of 24000 g mg −1 h −1 was obtained for PAF-1-NDMB. To the best of our knowledge, this value is the highest among all adsorbent materials reported so far for PFOA adsorption, such as DFB-CDP (64.8 g mg −1 h −1 ) 16 , MIL-101(Cr) (0.0082 g mg −1 h −1 ) 20 , MWNTs (0.00903 g mg −1 h −1 ) 51 , FCX4-P (3.8 g mg −1 h −1 ) 52 , UIO-67 (0.036 g mg −1 h −1 ) 53 , AC (4.72 g mg −1 h −1 ) 54 . Fig.…”
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.
“…5c ) of 24000 g mg −1 h −1 was obtained for PAF-1-NDMB. To the best of our knowledge, this value is the highest among all adsorbent materials reported so far for PFOA adsorption, such as DFB-CDP (64.8 g mg −1 h −1 ) 16 , MIL-101(Cr) (0.0082 g mg −1 h −1 ) 20 , MWNTs (0.00903 g mg −1 h −1 ) 51 , FCX4-P (3.8 g mg −1 h −1 ) 52 , UIO-67 (0.036 g mg −1 h −1 ) 53 , AC (4.72 g mg −1 h −1 ) 54 . Fig.…”
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.
“…Studied adsorbents range from activated carbon (AC) (Du et al, 2015;Xu et al, 2020), minerals (Shih and Wang, 2013;Wang and Shih, 2011), magnetic nanoparticles (Badruddoza et al, 2017), polymers (Xiao et al, 2017), resins (Yang et al, 2018), functionalized cellulose (Ateia et al, 2018), graphene oxide-silica hybrid (Ali et al, 2020), and metal-organic frameworks (MOFs) Jun et al, 2019;Sini et al, 2018Sini et al, , 2019. However, except for MOFs, most adsorbents only exhibit between low and moderate PFOA uptake compared to the industrial AC standard (>90% removal, 3M Company, USA) (Vecitis et al, 2009).…”
“…19 Studied adsorbents range from activated carbon (AC), 20,21 minerals, 22,23 magnetic nanoparticles, 24 polymers, 25 resins, 26 functionalized cellulose 27 and metal-organic frameworks (MOFs). [28][29][30][31][32] However, except for MOFs, most adsorbents only exhibit between low and moderate PFOA uptake compared to the industrial standard of AC (>90% removal, 3M Company, USA). 33 MOFs refer to a novel class of porous materials made from organic bridging linkers and metal atoms.…”
<div><b>Abstract</b></div><div>A new synthesis method was developed to prepare an aluminum-based metal organic framework (MIL-96) with a larger particle size and different crystal habits. A low cost and water-soluble polymer, hydrolyzed polyacrylamide (HPAM), was added in varying quantities into the synthesis reaction to achieve >200% particle size enlargement with controlled crystal morphology. The modified adsorbent, MIL-96-RHPAM2, was systematically characterized by SEM, XRD, FTIR, BET and TGA-MS. Using activated carbon (AC) as a reference adsorbent, the effectiveness of MIL-96-RHPAM2 for perfluorooctanoic acid (PFOA) removal from water was examined. The study confirms stable morphology of hydrated MIL-96-RHPAM2 particles as well as a superior PFOA adsorption capacity (340 mg/g) despite its lower surface area, relative to standard MIL-96. MIL-96-RHPAM2 suffers from slow adsorption kinetics as the modification significantly blocks pore access. The strong adsorption of PFOA by MIL-96-RHPAM2 was associated with the formation of electrostatic bonds between the anionic carboxylate of PFOA and the amine functionality present in the HPAM backbone. Thus, the strongly held PFOA molecules in the pores of MIL-96-RHPAM2 were not easily desorbed even after eluted with a high ionic strength solvent (500 mM NaCl). Nevertheless, this simple HPAM addition strategy can still chart promising pathways to impart judicious control over adsorbent particle size and crystal shapes while the introduction of amine functionality onto the surface chemistry is simultaneously useful for enhanced PFOA removal from contaminated aqueous systems.<br></div>
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