scholarly journals CO2/N2 Gas Separation Using Pebax/ZIF-7—PSf Composite Membranes

Membranes ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 708
Author(s):  
Soong‐Seok Yoon ◽  
Hyun‐Kyung Lee ◽  
Se‐Ryeong Hong
Keyword(s):  
Surface Area ◽  
Coating Layer ◽  
Composite Membranes ◽  
Gas Permeation ◽  
Bet Surface Area ◽  
Zeolitic Imidazolate Framework ◽  
Adsorption Selectivity ◽  
Selective Layer ◽  
Ideal Selectivity ◽  
Permeation Properties

In this study, we mixed the zeolitic imidazolate framework-7 (ZIF-7) with poly(ether-b-amide)® 2533 (Pebax-2533) and used it as a selective layer for a composite membrane. We prepared the composite membrane’s substrate using polysulfone (PSf), adjusted its pore size using polyethylene glycol (PEG), and applied polydimethylsiloxane (PDMS) to the gutter layer and the coating layer. Then, we investigated the membrane’s properties of gases by penetrating a single gas (N2, CO2) into the membrane. We identified the peaks and geometry of ZIF-7 to determine if it had been successfully synthesized. We confirmed that ZIF-7 had a BET surface area of 303 m2/g, a significantly high Langmuir surface area of 511 m2/g, and a high CO2/N2 adsorption selectivity of approximately 50. Considering the gas permeation, with ZIF-7 mixed into Pebax-2533, N2 permeation decreased from 2.68 GPU in a pure membrane to 0.43 GPU in the membrane with ZIF-7 25 wt%. CO2 permeation increased from 18.43 GPU in the pure membrane to 26.22 GPU in the ZIF-7 35 wt%. The CO2/N2 ideal selectivity increased from 6.88 in the pure membrane to 50.43 in the ZIF-7 25 wt%. Among the membranes, Pebax-2533/ZIF-7 25 wt% showed the highest permeation properties and the characteristics of CO2-friendly ZIF-7.

scholarly journals Fabrication of novel particle electrode γ-Al2O3@ZIF-8 and its application for degradation of Rhodamine B

2019 ◽  
Vol 80 (1) ◽  
pp. 109-116 ◽  
Author(s):  
Liguo Zhang ◽  
Caixia Ma ◽  
Lei Liu ◽  
Jingshi Pan ◽  
Qilin Wang
Keyword(s):  
Surface Area ◽  
Removal Efficiency ◽  
Rhodamine B ◽  
Three Dimensional ◽  
Cell Voltage ◽  
Bet Surface Area ◽  
Order Kinetic ◽  
Zeolitic Imidazolate Framework ◽  
Crystallization Method ◽  
Order Kinetic Model

Abstract Due to the high Brunauer–Emmett–Teller (BET) surface area of zeolitic imidazolate framework (ZIF)-8, a secondary crystallization method was used to prepare a particle electrode of γ-Al2O3@ZIF-8. According to the results from a field emission scanning electron microscope (SEM) and X-ray diffractometer (XRD), the particle electrode of γ-Al2O3 was successfully loaded with ZIF-8, and the BET surface area (1,433 m2/g) of ZIF-8 was over ten times that of γ-Al2O3. The key operation parameters of cell voltage, pH, initial RhB concentration and electrolyte concentration were all optimized. The observed rate constant (kobs) of the pseudo-first-order kinetic model for the electrocatalytic oxidation (ECO) system with the particle electrode of γ-Al2O3@ZIF-8 (15.2 × 10−2 min−1) was over five times higher than that of the system with the traditional particle electrode of γ-Al2O3 (2.6 × 10−2 min−1). The loading of ZIF-8 on the surface of γ-Al2O3 played an important role in improving electrocatalytic activity for the degradation of Rhodamine B (RhB), and the RhB removal efficiency of the three-dimensional (3D) electrocatalytic system with the particle electrode of γ-Al2O3@ZIF-8 was 93.5% in 15 min, compared with 27.5% in 15 min for the particle electrode of γ-Al2O3. The RhB removal efficiency was kept over 85% after five cycles of reuse for the 3D electrocatalytic system with the particle electrode of γ-Al2O3@ZIF-8.

scholarly journals Gas Permeation Properties of Conducting Polymer/Porous Media Composite Membranes II

1994 ◽  
Vol 26 (7) ◽  
pp. 833-839 ◽  
Author(s):  
Kensuke Kamada ◽  
Jun Kamo ◽  
Akira Motonaga ◽  
Tadashi Iwasaki ◽  
Hiroshi Hosokawa
Keyword(s):  
Porous Media ◽  
Conducting Polymer ◽  
Composite Membranes ◽  
Gas Permeation ◽  
Permeation Properties

Development and gas permeation properties of microporous amorphous TiO2–ZrO2–organic composite membranes using chelating ligands

2014 ◽  
Vol 461 ◽  
pp. 96-105 ◽  
Author(s):  
Toshiya Fukumoto ◽  
Tomohisa Yoshioka ◽  
Hiroki Nagasawa ◽  
Masakoto Kanezashi ◽  
Toshinori Tsuru
Keyword(s):  
Composite Membranes ◽  
Gas Permeation ◽  
Chelating Ligands ◽  
Amorphous Tio2 ◽  
Permeation Properties

Polyalkylmethylsiloxanes composite membranes for hydrocarbon/methane separation: Eight component mixed-gas permeation properties

2020 ◽  
Vol 241 ◽  
pp. 116696 ◽  
Author(s):  
E.A. Grushevenko ◽  
I.L. Borisov ◽  
A.A. Knyazeva ◽  
V.V. Volkov ◽  
A.V. Volkov
Keyword(s):  
Composite Membranes ◽  
Gas Permeation ◽  
Mixed Gas ◽  
Permeation Properties

Characterization and gas permeation properties of polyimide/ZSM-5 zeolite composite membranes containing ionic liquid

2014 ◽  
Vol 454 ◽  
pp. 330-338 ◽  
Author(s):  
Ryohei Shindo ◽  
Masanori Kishida ◽  
Hideaki Sawa ◽  
Takashi Kidesaki ◽  
Shuichi Sato ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Composite Membranes ◽  
Gas Permeation ◽  
Zeolite Composite ◽  
Permeation Properties

Effects of 60Co-Irradiation on Gas Permeation Properties of Polyimide Membranes

2014 ◽  
Vol 912-914 ◽  
pp. 123-126
Author(s):  
Yu Hua Qiao ◽  
Huai Min Miao ◽  
Yong Biao Xu ◽  
Wei Jiang ◽  
Yan Hong Zheng ◽  
...  
Keyword(s):  
Gas Separation ◽  
Radiation Effects ◽  
Gas Permeability ◽  
Gas Permeation ◽  
Ideal Selectivity ◽  
Tetracarboxylic Dianhydride ◽  
Permeation Properties ◽  
The Ideal ◽  
Polyimide Membranes

Radiation effects on polyimide (PI) membranes were studied with different irradiation doses by60Co. The PI membrane were synthesized from 2,2-bis (3-amino-4-hydroxyphenyl) hexafluoropropane (Bis-AP-AF) with 3,3',4,4'-Benzophenone tetracarboxylic dianhydride (BTDA). The single gas permeability of He, H2, CO2, O2, N2and CH4were measured and compared in order to determine the effect of the the irradiation doses on the gas separation properties. The results showed that the ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2of the irradiation PI membrane can be significantly improved by irradiation of60Co source. The optimum irradiation doses were 50 kGy. The highest ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2is 3635.86, 2287.57, 282.00 and 205.29, respectively. In other word, the ideal selectivity of He/CH4, H2/CH4, CO2/CH4and H2/N2of the irradiation PI membrane with 50 kGy irradiation doses is 2.27, 2.11, 1.89 and 1.08 times higher than that of the PI membranes without irradiation.

scholarly journals Synthesis and Gas-Permeation Characterization of a Novel High-Surface Area Polyamide Derived from 1,3,6,8-Tetramethyl-2,7-diaminotriptycene: Towards Polyamides of Intrinsic Microporosity (PIM-PAs)

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 361 ◽  
Author(s):  
Giuseppe Genduso ◽  
Bader Ghanem ◽  
Yingge Wang ◽  
Ingo Pinnau
Keyword(s):  
Surface Area ◽  
Gas Permeability ◽  
High Surface ◽  
High Surface Area ◽  
Gas Permeation ◽  
Bet Surface Area ◽  
Mixed Gas ◽  
Fractional Free Volume ◽  
Intrinsic Microporosity

A triptycene-based diamine, 1,3,6,8-tetramethyl-2,7-diamino-triptycene (TMDAT), was used for the synthesis of a novel solution-processable polyamide obtained via polycondensation reaction with 4,4′-(hexafluoroisopropylidene)bis(benzoic acid) (6FBBA). Molecular simulations confirmed that the tetrasubstitution with ortho-methyl groups in the triptycene building block reduced rotations around the C–N bond of the amide group leading to enhanced fractional free volume. Based on N2 sorption at 77 K, 6FBBA-TMDAT revealed microporosity with a Brunauer–Emmett–Teller (BET) surface area of 396 m2 g−1; to date, this is the highest value reported for a linear polyamide. The aged 6FBBA-TMDAT sample showed moderate pure-gas permeabilities (e.g., 198 barrer for H2, ~109 for CO2, and ~25 for O2) and permselectivities (e.g., αH2/CH4 of ~50) that position this polyamide close to the 2008 H2/CH4 and H2/N2 upper bounds. CO2–CH4 mixed-gas permeability experiments at 35 °C demonstrated poor plasticization resistance; mixed-gas permselectivity negatively deviated from the pure-gas values likely, due to the enhancement of CH4 diffusion induced by mixing effects.

Electron beam induced modification of ZIF-8 membrane permeation properties

2021 ◽  
Author(s):  
Yurun Miao ◽  
Dennis Lee ◽  
Matheus Dorneles de Mello ◽  
Mohammed Abdel-Rahman ◽  
Peter Corkery ◽  
...  
Keyword(s):  
Electron Beam ◽  
Electron Beam Irradiation ◽  
Gas Permeation ◽  
Membrane Permeation ◽  
Beam Irradiation ◽  
Ideal Selectivity ◽  
Permeation Properties

Modification of the gas permeation properties of ZIF-8 membranes using electron beam irradiation is reported. 3.8 and 3.2 fold enhancements in ideal selectivity for CO2/N2 and CO2/CH4 can be achieved...

scholarly journals Synthesis of Zeolitic - Imidazolate Framework - 67 in Ethanol by Using Ultrasonication 

2021 ◽  
Vol 31 (1) ◽  
pp. 11-15
Keyword(s):  
Methylene Blue ◽  
Surface Area ◽  
Bet Surface Area ◽  
Thermal Method ◽  
N2 Adsorption ◽  
Zeolitic Imidazolate Framework ◽  
Synthesis Time ◽  
Nano Material ◽  
Ft Ir ◽  
Adsorption Desorption

The ZIF-67 nanocrystal was successfully synthesized in ethanol as solvent by using ultrasound with shorter synthesis time as compared to solvo-thermal method. The synthesized ZIF-67 crystals were characterized by XRD, SEM, TEM, FT-IR, N2 adsorption-desorption and TGA/DTA. It was found that the ZIF-67 crystals were highly stable up to 350°C (in air), and have shown high crystallinity with a uniform crystallite size of around 50 nm (TEM), BET surface area of 1363 m2/g and Langmuir surface area of 1912 m2/g. Methylene blue absorption and photocatalysis of ZIF-67 nano-material were investigated. The results indicated the material is capable to promote photocatalysis to treat methylene blue, furthermore, the effect was enhanced with the addition of H2O2

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