Effect of Time, Temperature, and Kinetics on the Hysteretic Adsorption–Desorption of H2, Ar, and N2in the Metal–Organic Framework Zn2(bpdc)2(bpee)

Langmuir ◽  
2011 ◽  
Vol 27 (23) ◽  
pp. 14169-14179 ◽  
Author(s):  
Sarmishtha Sircar ◽  
Haohan Wu ◽  
Jing Li ◽  
Angela D. Lueking
Keyword(s):  
Metal Organic Framework ◽  
Metal Organic ◽  
Adsorption Desorption ◽  
Organic Framework

scholarly journals A STUDY ON HYDROTHERMAL SYNTHESIS OF METAL–ORGANIC FRAMEWORK MIL-101

2017 ◽  
Vol 126 (1C) ◽  
pp. 21
Author(s):  
Võ Thị Thanh Châu ◽  
Hoàng Văn Đức
Keyword(s):  
Hydrothermal Synthesis ◽  
Photoelectron Spectroscopy ◽  
Metal Organic Framework ◽  
Hydrothermal Process ◽  
Nitrogen Adsorption ◽  
X Ray ◽  
Transmission Electron ◽  
Metal Organic ◽  
Adsorption Desorption ◽  
Organic Framework

<p>In the present paper, a synthesis of MIL-101 by hydrothermal process was demonstrated. The obtained samples were characterized by powder X-ray diffraction (PXRD), transmission electron microscope (TEM), nitrogen adsorption/desorption isotherms at 77K, X-ray photoelectron spectroscopy (XPS). The results showed that MIL-101 synthesized by optimal conditions exhibited high crystallinity and surface area. The obtained MIL-101 possesses high stability in water and several organic solvents.</p><p><strong>Keywords:</strong> MIL-101, hydrothermal synthesis, metal organic framework-101. </p>

scholarly journals Study of Curcumin Adsorption of Nano Fe-based Metal-Organic Framework

2020 ◽  
Vol 4 (4) ◽  
pp. First
Author(s):  
Trang Thị Thu Nguyễn ◽  
Ý Thị Đặng ◽  
Linh Hồ Thùy Nguyễn ◽  
Hạnh Thị Kiều Tạ ◽  
Thắng Bách Phan ◽  
...  
Keyword(s):  
Particle Size ◽  
Metal Organic Framework ◽  
Crystal Formation ◽  
X Ray Diffraction ◽  
Isothermal Adsorption ◽  
Framework Materials ◽  
Metal Organic ◽  
Ft Ir ◽  
Adsorption Desorption ◽  
Organic Framework

Highly porous and biocompatible nano metal-organic framework materials (NMOF) are increasingly being applied in biomedical fields, especially as pharmaceutical adsorbent materials. Curcumin, found in turmeric, is a widely common herb in Eastern which has recently used in many applications in supporting cancer treatment. In the synthesis of MOF materials, the use of surfactants allows to control the morphology, the process of crystal formation and development and particle size of the material. In this research, MIL-100 (Fe) nanomaterials were successfully synthesized at room temperature in the presence of polyvinylpyrrolidone surfactant (PVP) to control the nanoparticle size about 50 nm in size. The synthesized MOF structure and properties were analyzed by using characterization techniques, including powder X-ray diffraction (PXRD), fourier-transform infrared (FT-IR), thermal gravimetric analyses (TGA) and nitrogen isothermal adsorption-desorption at 77 K. The characterization results showed that MIL-100 (Fe) nanomaterials have high crystallinity, large surface area, and highly thermal stability. However, its particle size is very small, only about 50 nm. Curcumin adsorption studies exhibited that this material had the ability to adsorb curcumin with an adsorption capacity up to 64.36 mg g-1. Kinetic and mechanism studies revealed that curcumin adsorption followed the pseudo-second model. In addition, thermodynamic studies proved that this was a spontaneous and exothermic adsorption process.

scholarly journals Aqueous synthesis of highly adsorptive copper–gallic acid metal–organic framework

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Badril Azhar ◽  
Artik Elisa Angkawijaya ◽  
Shella Permatasari Santoso ◽  
Chintya Gunarto ◽  
Aning Ayucitra ◽  
...  
Keyword(s):  
Gallic Acid ◽  
Metal Organic Framework ◽  
Synthesis Temperature ◽  
Molar Ratio ◽  
Aqueous Synthesis ◽  
Synthesis Conditions ◽  
Metal Organic ◽  
The Stability ◽  
Adsorption Desorption ◽  
Organic Framework

Abstract A greener route to synthesize mesoporous copper–gallic acid metal–organic framework (CuGA MOF) than the conventional method using harmful DMF solvent was proposed in this study. Various synthesis attempts were conducted by modifying the synthesis conditions to produce CuGA MOF with comparable physical properties to a reference material (DMF-synthesized CuGA NMOF). The independent variables investigated include the molar ratio of NaOH to GA (1.1 to 4.4) and the synthesis temperature (30, 60, 90 °C). It was found that proper NaOH addition was crucial for suppressing the generation of copper oxide while maximizing the formation of CuGA MOF. On the other hand, the reaction temperature mainly affected the stability and adsorption potential of CuGA MOF. Reacting Cu, GA, and NaOH at a molar ratio of 1:1:2.2 and a temperature of 90 °C, produced mesoporous MOF (CuGA 90–2.2) with a surface area of 198.22 m2/g, a pore diameter of 8.6 nm, and a thermal stability of 219 °C. This MOF exhibited an excellent adsorption capacity for the removal of methylene blue (124.64 mg/g) and congo red (344.54 mg/g). The potential usage of CuGA 90–2.2 as a reusable adsorbent was demonstrated by its high adsorption efficiency (> 90%) after 5 adsorption–desorption cycles.

scholarly journals Synthesis of MIL-53(Fe) Metal-Organic Framework Material and Its Application as a Catalyst for Fenton-Type Oxidation of Organic Pollutants

2021 ◽  
Vol 2021 ◽  
pp. 1-13
Author(s):  
Pham Dinh Du ◽  
Pham Ngoc Hoai
Keyword(s):  
Electron Microscopy ◽  
Reaction Time ◽  
Photoelectron Spectroscopy ◽  
Metal Organic Framework ◽  
Reaction System ◽  
Molar Ratio ◽  
X Ray ◽  
Metal Organic ◽  
Adsorption Desorption ◽  
Organic Framework

The iron (III) benzene dicarboxylate metal-organic framework material (MIL-53(Fe)) was synthesized with either the solvent-thermal or hydrothermal method under different conditions. The influence of the type of solvents, molar ratio of precursors and solvent, temperature, and reaction time on the structure of MIL-53(Fe) was investigated. The material was characterized by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and N2 adsorption/desorption isotherm. The MIL-53(Fe) structure formed in N′, N-dimethylformamide (DMF) and methanol (MeOH) but not in water. In DMF, the molar ratio of precursors and solvent, temperature, and reaction time had a significant effect on the crystal structure of MIL-53(Fe). Under optimal conditions, MIL-53(Fe) has high crystallinity and a large specific surface area ( S BET  = 88.2 m2/g). The obtained MIL-53(Fe) could serve as a potential heterogeneous catalyst to oxidize phenol (PhN), rhodamine B (RhB), and methylene blue (MtB) in the Fenton-like reaction system at the different solution pHs.

Characterization of a Holmium 4,4′-Biphenyldicarboxylate Metal-Organic Framework and Its Potential as a Holmium Carrier System

2020 ◽  
Vol 20 (5) ◽  
pp. 3019-3024 ◽  
Author(s):  
Juan P. Vizuet ◽  
Abigail L. Lewis ◽  
Gregory T. McCandless ◽  
Kenneth J. Balkus
Keyword(s):  
Metal Organic Framework ◽  
X Ray Diffraction ◽  
X Ray ◽  
Metal Organic ◽  
Solvent Molecules ◽  
The Stability ◽  
Adsorption Desorption ◽  
Organic Linker ◽  
Organic Framework

There is growing interest in Holmium carriers for radiotherapeutic applications. In this work, a holmium-based metal-organic framework (MOF) using the 4,4′-biphenyldicarboxylic acid (H2BPDC) linker was synthesized and characterized to explore its potential as a radiotherapeutic carrier. The 3D MOF [Ho(BPDC)2]·(CH3)2NH2 was characterized by single crystal X-ray diffraction, FTIR, TGA and PXRD. A challenge to overcome in lanthanide-based MOFs is the deformation or collapse of the framework that can occur after evacuation of the pores. This structure displays high thermal stability and no collapse was observed when the molecules confined in the pores were removed. The coordination around the holmium center (CN = 8) is the key to this stability since only the organic linker and no solvent molecules coordinate to the metallic center. The porosity of the material was confirmed by high-pressure carbon dioxide (CO2) adsorption–desorption analysis. The stability of the MOF, its holmium content (28 wt%) and its porosity are features that make this material a potential holmium carrier for radiotherapeutic applications.

scholarly journals Single-crystal and humidity-controlled powder diffraction study of the breathing effect in a metal–organic framework upon water adsorption/desorption

2016 ◽  
Vol 52 (45) ◽  
pp. 7229-7232 ◽  
Author(s):  
Javier Aríñez-Soriano ◽  
Jorge Albalad ◽  
Christian Vila-Parrondo ◽  
Javier Pérez-Carvajal ◽  
Sabina Rodríguez-Hermida ◽  
...  
Keyword(s):  
Single Crystal ◽  
Diffraction Study ◽  
Powder Diffraction ◽  
Water Adsorption ◽  
Metal Organic Framework ◽  
Metal Organic ◽  
Adsorption Desorption ◽  
Organic Framework

Water adsorption/desorption-triggered single-crystal to single-crystal transformations in a MOF are studied.

Switchable molecular sieving of a capped metal organic framework membrane

2020 ◽  
Vol 8 (38) ◽  
pp. 19984-19990
Author(s):  
Shuai Zhang ◽  
Bo Gui ◽  
Teng Ben ◽  
Shilun Qiu
Keyword(s):  
Metal Organic Framework ◽  
Membrane Surface ◽  
Light Treatment ◽  
Side Group ◽  
Metal Organic ◽  
Adsorption Desorption ◽  
Molecular Sieving ◽  
Organic Framework

A functional MOF with an azobenzene side group, UiO-68-azo, was fabricated into a continuous membrane. The enhanced permselectivity was controllable through UV/vis light treatment of the adsorption/desorption of β-CD on the membrane surface.

scholarly journals COMPARATIVE STUDY ON SYNTHESIS OF METAL ORGANIC FRAMEWORK-199 BY MICROWAVE AND SOLVOLTHERMAL PROCESS

2017 ◽  
Vol 126 (1C) ◽  
pp. 107
Author(s):  
Tran Vinh Thien
Keyword(s):  
Comparative Study ◽  
Microwave Synthesis ◽  
Metal Organic Framework ◽  
Textural Properties ◽  
Nitrogen Adsorption ◽  
X Ray Diffraction ◽  
Synthesis Time ◽  
Metal Organic ◽  
Adsorption Desorption ◽  
Organic Framework

<p>In the present paper, a comparative study on the synthesis of metal organic framework-199 by microwave and solvolthermal method was demonstrated.<strong> </strong>The obtained materials were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), nitrogen adsorption/desorption isotherms and thermal gravity (TG). The microwave synthesis of MOF-199 has been compared to its conventional hydrothermal synthesis. It is found that by using microwave synthesis MOF-199 can be obtained in a much shorter synthesis time with improved yield and textural properties. It is supposed that the microwave energy emitted fast and uniformly, creating nuclei through the solution which quickly grew to crystals and both the nucleation and crystallization steps were accelerated. These make the microwave synthesis advantages over solvolthermal synthesis.<strong></strong></p>

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