Influence of crystal topology and interior surface functionality of metal-organic frameworks on PFOA sorption performance

Chen, Meng-Jia; Yang, An‐Chih; Wang, Nan-Hui; Chiu, Hao-Che; Li, Yung-Lin; Kang, Dun‐Yen; Lo, Shang‐Lien

doi:10.1016/j.micromeso.2016.08.046

Cited by 71 publications

(42 citation statements)

References 73 publications

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“…The nitrobenzene adsorption capacity of MIL‐53(Al) decreases considerably with a decrease in the pH value of the water . ZIF‐L has high adsorption capacity for perfluorooctanoic acid; however, its crystal structure is essentially destroyed by the sorption operation …”

Section: Introductionmentioning

confidence: 99%

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Surface Engineering Layered Metal–Organic Framework to Enhance Processability and Stability in Water

Chi

Kan

et al. 2017

ChemNanoMat

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Despite considerable advancements of metal–organic frameworks (MOFs), the practical implementation of MOFs is still hindered by issues of stability and processability. In this work, we sought to overcome these difficulties through surface engineering. As a proof of concept, we subjected ZIF‐L with a unique layered crystal morphology to a shell‐ligand exchange reaction. This resulted in the partial replacement of 2‐methylimidazole by benzimidazole as the linker in the framework on the outer surface of the crystals, thereby changing the surface of the ZIF‐L crystal from hydrophilic to hydrophobic. The engineered ZIF‐L (hereafter referred to as Benz‐ZIF‐L) formed a stable dispersion in the nonpolar solvent, hexane. The suspension of Benz‐ZIF‐L in hexane was applied via spin coating to a porous substrate of poly(vinylidene fluoride) (PVDF), resulting in a thin film of high density. In contrast, the application of a suspension of pure ZIF‐L in the same manner did not result in the formation of a thin film. Benz‐ZIF‐L also exceeded pure ZIF‐L with regard to hydrothermal stability and acid/base resistance.

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Section: Introductionmentioning

confidence: 99%

“…The layered structure of ZIF‐L gives it high adsorption capacity as well as high adsorption selectivity for CO 2 . ZIF‐L also has excellent sorption capacity for perfluorooctanoic acid; however, its poor stability in aqueous phase greatly limits its applicability in water treatment processes …”

Section: Introductionmentioning

confidence: 99%

Surface Engineering Layered Metal–Organic Framework to Enhance Processability and Stability in Water

Chi

Kan

et al. 2017

ChemNanoMat

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“…The authors concluded that the synergetic effects of hydrophobic and electrostatic interactions were important factors in the adsorption process. Three MOFs, zeolitic imidazolate framework-7 (ZIF-7), ZIF-8, and ZIF-L were investigated for the adsorption of PFOA in an aqueous solution by Chen et al (2016). The PFOA sorption performance of ZIF-7, ZIF-8, and ZIF-L was then compared with the performance of two commercialized adsorbents, zeolite 13X and activated carbon.…”

Section: Mofs and Composites For Adsorptive Removal And Photocatalytimentioning

confidence: 99%

A Critical Review on Metal-Organic Frameworks and Their Composites as Advanced Materials for Adsorption and Photocatalytic Degradation of Emerging Organic Pollutants from Wastewater

et al. 2020

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Water-borne emerging pollutants are among the greatest concern of our modern society. Many of these pollutants are categorized as endocrine disruptors due to their environmental toxicities. They are harmful to humans, aquatic animals, and plants, to the larger extent, destroying the ecosystem. Thus, effective environmental remediations of these pollutants became necessary. Among the various remediation techniques, adsorption and photocatalytic degradation have been single out as the most promising. This review is devoted to the compilations and analysis of the role of metal-organic frameworks (MOFs) and their composites as potential materials for such applications. Emerging organic pollutants, like dyes, herbicides, pesticides, pharmaceutical products, phenols, polycyclic aromatic hydrocarbons, and perfluorinated alkyl substances, have been extensively studied. Important parameters that affect these processes, such as surface area, bandgap, percentage removal, equilibrium time, adsorption capacity, and recyclability, are documented. Finally, we paint the current scenario and challenges that need to be addressed for MOFs and their composites to be exploited for commercial applications.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

Polymer-Assisted Modification of Metal-Organic Framework MIL-96 (Al): Influence on Particle Size, Crystal Morphology and Perfluorooctanoic Acid (PFOA) Removal

Azmi¹,

Ladewig

2020

Preprint

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<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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Influence of crystal topology and interior surface functionality of metal-organic frameworks on PFOA sorption performance

Cited by 71 publications

References 73 publications

Surface Engineering Layered Metal–Organic Framework to Enhance Processability and Stability in Water

Surface Engineering Layered Metal–Organic Framework to Enhance Processability and Stability in Water

A Critical Review on Metal-Organic Frameworks and Their Composites as Advanced Materials for Adsorption and Photocatalytic Degradation of Emerging Organic Pollutants from Wastewater

Polymer-Assisted Modification of Metal-Organic Framework MIL-96 (Al): Influence on Particle Size, Crystal Morphology and Perfluorooctanoic Acid (PFOA) Removal

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