scholarly journals Adsorptive Behavior of Prepared Metal-Organic Framework Composites on Phosphates in Aqueous Solutions

2021 ◽  
Vol 2021 ◽  
pp. 1-10
Author(s):  
Yan Zhao ◽  
Hui-xuan Guo ◽  
Hong-guang Han ◽  
Jia-qi Zhang ◽  
Xiao-min Hu
Keyword(s):  
Metal Organic Framework ◽  
Synthesis Method ◽  
Treatment Method ◽  
Phosphate Removal ◽  
Uniform Size ◽  
Characterization Methods ◽  
Adsorption Sites ◽  
Adsorptive Behavior ◽  
Deep Purification ◽  
Metal Organic

As an efficient water treatment method for treating dilute solution systems, electrosorption is promising for the separation and recovery of organic compounds, wastewater treatment, and deep purification of water. Here, two types of UiO-66 samples were prepared using the solvothermal synthesis method, and the effects of different regulators on the microstructure of materials were compared using the various characterization methods. The electrochemical properties of the activated carbon and two types of materials were tested by cyclic voltammetry and AC impedance spectroscopy, and the desalination effect of the materials on phosphate was investigated. The UiO-66 material with uniform-size particles, smaller-size particles, and more surface adsorption sites exhibited better phosphate removal and adsorption capacity. It was found that the desalination process of the UiO-66 material is reversible, and the adsorbent material can be reused, which is advantageous for engineering applications.

A 2D porous Pb-MOF based on 2-nitroimidazole: CO2 adsorption, electronic structure and luminescence

2021 ◽  
Author(s):  
Xiu-Yuan Li ◽  
Wang Ying-Bo ◽  
Song Yan ◽  
Xiang Dan ◽  
Chaozheng He
Keyword(s):  
Electronic Structure ◽  
Electronic Structures ◽  
Metal Ion ◽  
Co2 Adsorption ◽  
Metal Organic Framework ◽  
Porous Metal ◽  
Adsorption Sites ◽  
Porous Framework ◽  
Metal Organic ◽  
Gcmc Simulations

Abstract A new porous metal-organic framework, [Pb5(Ac)7(nIm)3]n (1), has been successfully synthesized by employing 2-nitroimidazole ligand and Pb2+ ion. 1 contains novel the ribbon-shaped Pb-O SBU and reveals a 2D porous framework with a 1D tubular channel. Moreover, 1 shows moderate adsorption uptake towards CO2 and luminescence properties from intraligand charge transfer. We further confirmed nitro group and metal ion are important adsorption sites by GCMC simulations, and the electronic structures of 1 was investigated.

scholarly journals Statistical Thermodynamic Model of Gas Adsorption in a Metal-Organic Framework Harboring a Rotaxane Molecular Shuttle

2019 ◽  
Author(s):  
Jonathan Carney ◽  
David Roundy ◽  
Cory M. Simon
Keyword(s):  
Thermodynamic Model ◽  
Gas Adsorption ◽  
Metal Organic Framework ◽  
Adsorption Properties ◽  
Statistical Thermodynamic ◽  
Temperature Sensitive ◽  
Adsorption Sites ◽  
Metal Organic ◽  
Dynamic Components ◽  
Molecular Shuttle

Metal-organic frameworks (MOFs) are modular and adjustable nano-porous materials with applications in gas storage, separations, and sensing. Flexible/dynamic components that respond to adsorbed gas can give MOFs unique or enhanced adsorption properties. Here, we explore the adsorption properties that could be imparted to a MOF by a rotaxane molecular shuttle (RMS) in its pores. In an RMS-MOF, a macrocyclic wheel is mechanically interlocked with a strut. The wheel shuttles between stations on the strut that are also gas adsorption sites. We pose and analyze a simple statistical thermodynamic model of gas adsorption in an RMS-MOF that accounts for (i) wheel/gas competition for sites on the strut and (ii) the entropy endowed by the shuttling wheel. We determine how the amount of gas adsorbed, position of the wheel, and energy change upon adsorption depend on temperature, pressure, and the interactions of the gas/wheel with the stations. Our model reveals that, compared to an ordinary Langmuir material, the chemistry of the RMS-MOF can be tuned to render adsorption more or less temperature-sensitive and release more or less heat upon adsorption. The model also uncovers a non-monotonic relationship between temperature and the position of the wheel if gas out-competes the wheel for its preferable station.

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

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>

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

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>

scholarly journals Facile stabilization of a cyclodextrin metal–organic framework under humid environment via hydrogen sulfide treatment

RSC Advances ◽  
2019 ◽  
Vol 9 (32) ◽  
pp. 18271-18276 ◽  
Author(s):  
Duo Ke ◽  
Jun-Feng Feng ◽  
Di Wu ◽  
Jun-Bo Hou ◽  
Xiao-Qin Zhang ◽  
...  
Keyword(s):  
Hydrogen Sulfide ◽  
Water Adsorption ◽  
Metal Organic Framework ◽  
Moisture Resistance ◽  
Adsorption Sites ◽  
Humid Environment ◽  
Metal Organic ◽  
Metal Ligand ◽  
Organic Framework

The moisture stable γ-CD-K-MOF was obtained by simply treating MOF with H2S gas. H2S acting as new water adsorption sites protected the metal–ligand bonds from water attack and thus enhanced the moisture resistance of γ-CD-K-MOF.

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

RSC Advances ◽  
2016 ◽  
Vol 6 (9) ◽  
pp. 7078-7085 ◽  
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.

ENHANCEMENT EFFECT OF LITHIUM-DOPING FUNCTIONALIZATION ON HYDROGEN ADSORPTION IN METAL-ORGANIC FRAMEWORK

2016 ◽  
Vol 24 (05) ◽  
pp. 1750067 ◽  
Author(s):  
LIANGZHI XIA ◽  
QING LIU ◽  
FENGLING WANG ◽  
YUPENG LI
Keyword(s):  
Hydrogen Adsorption ◽  
Metal Organic Framework ◽  
Enhancement Effect ◽  
Li Doping ◽  
Adsorption Sites ◽  
Hydrogen Molecules ◽  
Metal Organic ◽  
Gravimetric Adsorption ◽  
Hydrogen Storage Performance ◽  
Grand Canonical

Grand canonical Monte-Carlo simulation was carried out to study the effect of linker functionalization by Li atoms. In this work, two new Li-doping structures, MOF-808-Li and MOF-808-OLi were theoretically constructed by physical modification and chemical modification, respectively. The results show that both these methods can improve the hydrogen storage performance significantly, owing to the Li atoms increasing the interaction energy between the hydrogen molecules and the Li-doped MOF-808. Furthermore, MOF-808-OLi shows higher hydrogen capacity in comparison to the H2 adsorption in the MOF-808-Li, this can be attributed to the new adsorption sites created by oxygen atom. The gravimetric adsorption capacity of MOF-808-OLi can reach 3.17[Formula: see text]wt.% at 77[Formula: see text]K and 1[Formula: see text]bar, which are significantly higher than the hydrogen adsorption in the unmodified MOF-808.

scholarly journals Facile synthesis of polyoxometalates tethered to post Fe-BTC frameworks for esterification of free fatty acids to biodiesel

RSC Advances ◽  
2019 ◽  
Vol 9 (14) ◽  
pp. 8113-8120 ◽  
Author(s):  
Qiuyun Zhang ◽  
Xiaofang Liu ◽  
Tingting Yang ◽  
Caiyan Yue ◽  
Quanlin Pu ◽  
...  
Keyword(s):  
Metal Organic Framework ◽  
Solid Acid Catalyst ◽  
Synthesis Method ◽  
Porous Metal ◽  
Acid Catalyst ◽  
Phosphomolybdic Acid ◽  
Biodiesel Production ◽  
One Pot ◽  
Metal Organic ◽  
Highly Porous

Phosphomolybdic acid was sequentially incorporated into a highly porous metal–organic framework by a one-pot synthesis method, and the prepared composite was used as an efficient and stable solid acid catalyst for biodiesel production.

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