Structural regulation of electroplating sludge by a metal–organic framework synthesis method for an enhanced denitrification activity

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

10.26434/chemrxiv.12262010.v1 ◽

2020 ◽

Author(s):

Luqman Hakim Mohd Azmi ◽

Daryl R. Williams ◽

Bradley P. Ladewig

Keyword(s):

Particle Size ◽

Crystal Morphology ◽

Low Cost ◽

Metal Organic Framework ◽

Synthesis Method ◽

Perfluorooctanoic Acid ◽

Water Soluble ◽

Water Soluble Polymer ◽

Metal Organic ◽

Organic Framework

<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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Polymer–metal–organic framework core–shell framework nanofibers via electrospinning and their gas adsorption activities

RSC Advances ◽

10.1039/c5ra23147g ◽

2016 ◽

Vol 6 (9) ◽

pp. 7078-7085 ◽

Cited By ~ 26

Author(s):

Ming Gao ◽

Lingwang Zeng ◽

Jun Nie ◽

Guiping Ma

Keyword(s):

Gas Adsorption ◽

Metal Organic Framework ◽

Synthesis Method ◽

Core Shell ◽

Polymer Metal ◽

Metal Organic ◽

Organic Framework

In this study, we have fabricated of PAN@ZIF-8 core–shell nanofibers by combining electrospinning techniques and the MOF synthesis method.

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Visible-Light-Mediated Photocatalytic Selective N-Methylation of Amines using CO2 under mild reaction condition via NH2-MIL-125 (Ti) MOF catalyst

10.26434/chemrxiv-2021-hzkzn ◽

2021 ◽

Author(s):

Jianguo liu ◽

Xiuzhi Wei ◽

Longlong Ma

Keyword(s):

Visible Light ◽

Metal Organic Framework ◽

Synthesis Method ◽

Selective Synthesis ◽

Facile Synthesis ◽

Reaction Conditions ◽

Reaction Condition ◽

Photocatalytic System ◽

Metal Organic ◽

Organic Framework

We herein describe a facile synthesis method of novel NH2-MIL-125 (Ti) metal organic framework as a photocatalyst, and the photochemical system was firstly developed for the direct N-methylation of amines under very mild reaction conditions of one bar CO2 and NaBH4. According to the optimization of reaction conditions, the selective synthesis of methylamines is achieved in good to excellent conversion and selectivity using visible light mediated photocatalytic system.

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A Novel Non-Enzymatic Electrochemical Hydrogen Peroxide Sensor Based on a Metal-Organic Framework/Carbon Nanofiber Composite

Molecules ◽

10.3390/molecules23102552 ◽

2018 ◽

Vol 23 (10) ◽

pp. 2552 ◽

Cited By ~ 8

Author(s):

Yijun Fu ◽

Jiamu Dai ◽

Yan Ge ◽

Yu Zhang ◽

Huizhen Ke ◽

...

Keyword(s):

High Efficiency ◽

Carbon Nanofiber ◽

Synergistic Effects ◽

Metal Organic Framework ◽

Synthesis Method ◽

One Pot ◽

Zeolitic Imidazolate Framework ◽

X Ray ◽

Metal Organic ◽

Organic Framework

A co-based porous metal-organic framework (MOF) of zeolitic imidazolate framework-67 (ZIF-67) and carbon nanofibers (CNFs) was utilized to prepare a ZIF-67/CNFs composite via a one-pot synthesis method. Scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDX), and X-ray diffraction (XRD) were employed to investigate the morphology, structure, and composition of the resulting composite. A novel high-performance non-enzymatic electrochemical sensor was constructed based on the ZIF-67/CNFs composite. The ZIF-67/CNFs based sensor exhibited enhanced electrocatalytic activity towards H2O2 compared to a pure ZIF-67-based sensor, due to the synergistic effects of ZIF-67 and CNFs. Meanwhile, chronoamperometry was utilized to explore the detection performance of the sensor. Results showed the sensor displayed high-efficiency electrocatalysis towards H2O2 with a detection limit of 0.62 μM (S/N = 3), a sensitivity of 323 µA mM−1 cm−2, a linear range from 0.0025 to 0.19 mM, as well as satisfactory selectivity and long-term stability. Furthermore, the sensor demonstrated its application potential in the detection of H2O2 in food.

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Investigation on Zr-based metal-organic framework (MOF-801) for high-performance separation of light alkanes

Chemical Communications ◽

10.1039/d1cc05306j ◽

2021 ◽

Author(s):

Hao Liu ◽

Boran Li ◽

Yayun Zhao ◽

Chunlong Kong ◽

Chen Zhou ◽

...

Keyword(s):

Chemical Stability ◽

High Performance ◽

Metal Organic Framework ◽

Synthesis Method ◽

Light Alkanes ◽

Separation Selectivity ◽

Metal Organic ◽

High Separation ◽

Thermal And Chemical Stability ◽

Organic Framework

A Zr-based metal-organic framework (MOF-801) with high thermal and chemical stability was prepared by solvethermal synthesis method. Notably, MOF-801 exhibits high separation selectivity for C3H8/CH4 and C2H6/CH4, making it possible...

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Room-Temperature Fabrication of a Nickel-Functionalized Copper Metal–Organic Framework (Ni@Cu-MOF) as a New Pseudocapacitive Material for Asymmetric Supercapacitors

Polymers ◽

10.3390/polym11050821 ◽

2019 ◽

Vol 11 (5) ◽

pp. 821 ◽

Cited By ~ 9

Author(s):

Yi Wang ◽

Shengqiang Nie ◽

Yuan Liu ◽

Wei Yan ◽

Shaomin Lin ◽

...

Keyword(s):

Room Temperature ◽

Metal Organic Framework ◽

Synthesis Method ◽

High Energy ◽

High Energy Density ◽

Copper Metal ◽

High Capacitance ◽

Metal Organic ◽

Post Modification ◽

Organic Framework

A nickel-functionalized copper metal–organic framework (Ni@Cu-MOF) was prepared by a facile volatilization method and a post-modification synthesis method at room temperature. The obtained Ni@Cu-MOF electrode delivered a high capacitance of 526 F/g at 1 A/g and had a long-term cycling stability (80% retention after 1200 cycles at 1 A/g) in a 6 M KOH aqueous solution. Furthermore, an asymmetric supercapacitor device was assembled from this Ni@Cu-MOF and activated carbon electrodes. The fabricated supercapacitor delivered a high capacitance of 48.7 F/g at 1 A/g and a high energy density of 17.3 Wh/kg at a power density of 798.5 kW/kg. This study indicates that the Ni@Cu-MOF has great potential for supercapacitor applications.

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Shaping and silane coating of a diamine-grafted metal-organic framework for improved CO2 capture

Communications Materials ◽

10.1038/s43246-020-00109-8 ◽

2021 ◽

Vol 2 (1) ◽

Author(s):

Jong Hyeak Choe ◽

Jeoung Ryul Park ◽

Yun Seok Chae ◽

Dae Won Kim ◽

Doo San Choi ◽

...

Keyword(s):

Alkyl Chain ◽

Metal Organic Framework ◽

Synthesis Method ◽

Working Capacity ◽

High Mechanical Strength ◽

Silane Coating ◽

Metal Organic ◽

Alumina Sol ◽

Scalable Synthesis ◽

Organic Framework

AbstractAlthough metal-organic framework (MOF) powders can be successfully shaped by conventional methods, postsynthetic functionalization of the shaped MOFs remains almost unexplored, yet is required to overcome intrinsic limitations, such as CO2 adsorption capacity and stability. Here, we present a scalable synthesis method for Mg2(dobpdc) MOF and its shaped beads, which are obtained by using a spray dry method after mixing Mg2(dobpdc) powders with alumina sol. The synthesized MOF/Al beads have micron-sized diameters with a moderate particle size distribution of 30–70 μm. They also maintain a high mechanical strength. N-ethylethylenediamine (een) functionalization and coating with long alkyl chain silanes results in een-MOF/Al-Si, which exhibits a significant working capacity of >11 wt% CO2 capture and high hydrophobicity. The een-MOF/Al-Si microbeads retain their crystallinity and improved CO2 uptake upon exposure to humid conditions for three days at a desorption temperature of 140 °C.

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Benign Synthesis of Metal-Organic Framework (MIL-101-Cr) and Evaluation of Carbon-dioxide Adsorption Behaviour Employing Adsorption Isotherm Models

Current Organic Synthesis ◽

10.2174/1570179419666211231113648 ◽

2021 ◽

Vol 19 ◽

Author(s):

Ayushi Singh ◽

Sibnath Kayal

Keyword(s):

Carbon Dioxide ◽

Co2 Adsorption ◽

Carbon Dioxide Capture ◽

Metal Organic Framework ◽

Synthesis Method ◽

Diffraction Method ◽

Sorption Behaviour ◽

Benign Synthesis ◽

Metal Organic ◽

Organic Framework

Background: In today’s world, rising temperature due to global warming is caused by higher concentration of carbon dioxide (CO2) emissions in the atmosphere. Metal-Organic Framework (MOF) materials have the potential to be used in carbon dioxide capture and utilization technology. Objective: The purpose of this work is to prepare metal-organic framework materials by a benign synthesis method using water as the solvent, followed by the characterization and property evaluation for CO2 adsorption study. Methods: MIL-101-Cr metal-organic framework and its derivatives with alkali ion dopants were prepared by benign hydrothermal synthesis route, which were characterized by powder X-ray diffraction method. The adsorption isotherms of CO2 for MIL-101-Cr and its derivatives were studied to comprehend the influence of alkali dopants on CO2 sorption behaviour. The equilibrium uptakes of CO2 were further evaluated by fitting the isotherms with Langmuir, Toth and Dubinin – Astakohv adsorption models to determine the adsorption parameters. Results: The crystalline structural integrity of MIL-101-Cr is not affected by doping with alkali ions. The isosteric heat of CO2 adsorption is diminished with an increase in alkali dopant size, while the induced surface structural heterogeneity increases with increasing alkali dopant size. Conclusion: The equilibrium and thermodynamic parameters calculated from this study are useful for applications in carbon dioxide capture and utilization technology.

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