scholarly journals The Long-Lasting Story of One Sensor Development: From Novel Ionophore Design toward the Sensor Selectivity Modeling and Lifetime Improvement

Sensors ◽  
2021 ◽  
Vol 21 (4) ◽  
pp. 1401
Author(s):  
Larisa Lvova ◽  
Donato Monti ◽  
Corrado Di Natale ◽  
Roberto Paolesse
Keyword(s):  
Anion Exchanger ◽  
Specific Interaction ◽  
Spectroscopic Studies ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Active Components ◽  
Nitrite Ion ◽  
Working Mechanism ◽  
Axial Coordination ◽  
Porphyrin Aggregation

The metalloporphyrin ligand bearing incorporated anion-exchanger fragment, 5-[4-(3-trimethylammonium)propyloxyphenyl]-10,15,20-triphenylporphyrinate of Co(II) chloride, CoTPP-N, has been tested as anion-selective ionophore in PVC-based solvent polymeric membrane sensors. A plausible sensor working mechanism includes the axial coordination of the target anion on ionophore metal center followed by the formed complex aggregation with the second ionophore molecule through positively charged anion-exchanger fragment. The UV-visible spectroscopic studies in solution have revealed that the analyte concentration increase induces the J-type porphyrin aggregation. Polymeric membranes doped with CoTPP-N showed close to the theoretical Nernstian response toward nitrite ion, preferably coordinated by the ionophore, and were dependent on the presence of additional membrane-active components (lipophilic ionic sites and ionophore) in the membrane phase. The resulting selectivity was a subject of specific interaction and/or steric factors. Moreover, it was demonstrated theoretically and confirmed experimentally that the selection of a proper ratio of ionophore and anionic additive can optimize the sensor selectivity and lifetime.

scholarly journals Potential responses to neutral thiophenols of polymeric membrane electrodes and their applications in potentiometric biosensing

RSC Advances ◽  
2015 ◽  
Vol 5 (122) ◽  
pp. 100689-100692 ◽  
Author(s):  
Long Li ◽  
Wei Qin
Keyword(s):  
Horseradish Peroxidase ◽  
Anion Exchanger ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Membrane Electrodes

Unexpected potential responses to electrically neutral thiophenols of anion-exchanger doped polymeric membranes have been observed and applied in potentiometric biosensing of horseradish peroxidase.

Effects of Ionic Liquid Blending in Polymeric Membrane: Physical Properties and Performance Evaluation

2014 ◽  
Vol 625 ◽  
pp. 680-684 ◽  
Author(s):  
Dzeti Farhah Mohshim ◽  
Hilmi Mukhtar ◽  
Zakaria Man
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Membrane Separation ◽  
Initial Study ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Separation Performance ◽  
Operating Pressure ◽  
Membrane Gas Separation ◽  
Pes Membrane

— Polymeric membranes have been extensively used in membrane gas separation process. Nowadays, peoples are modifying the membrane by many ways like coating with ionic liquids to further enhance the membrane separation performance. In this project, ionic liquid modified polymeric membranes (ILMPM) have been successfully developed by blending the ionic liquids with the polymer via solvent evaporation method. The ionic liquid used was 1-ethyl-3-methylimidazolium bis (trifluoromethylsulfonyl) imide, ([emim][Tf2N]) and for comparison purpose, the compositions were varied at 10 and 20 wt/wt%. In general, the blending of [emim][Tf2N] and PES has produced dense membrane with miscible mixture without any phase separation. It was observed that, the CO2permeance of ILMPM has been improved about 271% as compared to the pure PES membrane. However, the CO2permeance decreased with increasing operating pressure, yet the ILMPM CO2permeance still higher than CO2permeance of pure PES membrane. In addition, the CO2/CH4separation performance has greatly increased about 162% as the IL composition is increased. This initial study has proven that IL helps to enhance of CO2permeation and improve selectivity.

Effect of Plasma Treatment on Surface Properties of Polymeric Membrane

2012 ◽  
Vol 585 ◽  
pp. 528-531 ◽  
Author(s):  
Awatif Saber Jasim ◽  
Khalaf Ibrahim Khaleel ◽  
Muhamad Abdul Kareem Ahmed ◽  
Y.K. Vijay ◽  
Sachin Surve
Keyword(s):  
Plasma Treatment ◽  
Surface Properties ◽  
Vacuum Chamber ◽  
High Vacuum ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Nitrogen Gas ◽  
Vis Spectroscopy ◽  
Solution Cast ◽  
Solution Cast Method

In the present work the effect of plasma treatment has been used to improve the surface properties of polymeric membranes. The polymeric membranes of polycarbonate (PC) were synthesized using solution cast method. The plasma treatment was done in high vacuum chamber using nitrogen gas and the pressure for the plasma treatment was » 10-2 mbar. The effect of plasma treatment on surface properties like morphology, roughness, wettability and optical properties has been characterized using optical microscopy and UV-Vis spectroscopy for different time of plasma treatment.

A Review on Glassy Polymeric Membranes for Gas Separation

2014 ◽  
Vol 625 ◽  
pp. 701-703 ◽  
Author(s):  
Marjan Farnam ◽  
Hilmi Mukhtar ◽  
Azmi Mohd Shariff
Keyword(s):  
Gas Separation ◽  
Upper Bound ◽  
Review Paper ◽  
Glassy Polymer ◽  
Polymer Membranes ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Mixed Matrix Membrane ◽  
Mixed Matrix ◽  
Trade Off

Polymeric membranes are widely used for gas separation purposes but their performance is restricted by the upper bound trade-off discovered by Robeson in 1991. The polymeric membrane can be glassy, rubbery or a blend of these two polymers. This review paper discusses the properties of glassy polymer membranes and their performance in gas separation. The area of improvement for glassy membrane with development of mixed matrix membrane is also highlighted.

Highly Hg2+-sensitive and selective fluorescent sensors in aqueous solution and sensors-encapsulated polymeric membrane

RSC Advances ◽  
2016 ◽  
Vol 6 (13) ◽  
pp. 10401-10411 ◽  
Author(s):  
Sasiwimon Kraithong ◽  
Pattareeya Damrongsak ◽  
Kullatat Suwatpipat ◽  
Jitnapa Sirirak ◽  
Pattanawit Swanglap ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Detection Limits ◽  
High Sensitivity ◽  
Fluorescent Sensors ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Sensitivity And Selectivity

The sensors in solutions and sensors encapsulated polymeric membranes exhibited high sensitivity and selectivity for Hg2+ detection, with detection limits of 0.2–49 ppb.

Antibacterial polymeric membranes: a short review

2018 ◽  
Vol 4 (8) ◽  
pp. 1078-1104 ◽  
Author(s):  
Munmun Mukherjee ◽  
Sirshendu De
Keyword(s):  
Short Review ◽  
Polymeric Membranes ◽  
Water Disinfection ◽  
Polymeric Membrane

Water disinfection mechanism of polymeric membrane.

Infrared and Raman Spectroscopic Studies of Solid Alkali Metal Nitrites

1971 ◽  
Vol 49 (8) ◽  
pp. 1289-1295 ◽  
Author(s):  
M. H. Brooker ◽  
D. E. Irish
Keyword(s):  
Alkali Metal ◽  
Raman Spectra ◽  
Spectroscopic Studies ◽  
Infrared And Raman Spectra ◽  
Nitrite Ion ◽  
Nitrate Ion ◽  
Raman Spectroscopic ◽  
Linkage Isomerism ◽  
Vibrational Bands ◽  
Cation Size

Infrared and Raman spectra of solid LiNO2•H2O, LiNO2, NaNO2, KNO2, and CsNO2 are presented and discussed. Pronounced changes in the spectra of LiNO2•H2O during dehydration to anhydrous LiNO2 are interpreted as evidence for an ordered distribution of NO2− ions over two non-equivalent sites (akin to linkage isomerism) in anhydrous LiNO2. The frequencies of the internal modes of the nitrite ion shift to lower values with increasing cation size. Vibrational bands due to nitrate ion present as an impurity are assigned.

Ionic Liquid Polymeric Membrane: Synthesis, Characterization & Performance Evaluation

2013 ◽  
Vol 594-595 ◽  
pp. 18-23 ◽  
Author(s):  
Dzeti Farhah Mohshim ◽  
Hilmi Mukhtar ◽  
Zakaria Man
Keyword(s):  
Ionic Liquid ◽  
Membrane Separation ◽  
Ideal Gas ◽  
Gas Permeation ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Separation Performance ◽  
Miscible Blends ◽  
Pes Membrane ◽  
The Ideal

Selected ionic liquids are known to enhance the absorption of CO2 for CO2 removal purpose. In the idea to improve the membrane separation performance for natural gas sweetening, ionic liquid modified polymeric membranes were fabricated by using polyethersulfone (PES) and blended with different composition of ionic liquid which are 5 wt% and 15 wt%. Each fabricated membranes were prepared and dried under solvent evaporation at 90°C. Dense structure observed from FESEM analysis indicated the miscible blends of ionic liquid and PES. TGA analysis showed all fabricated membranes are still containing solvent and this resembles that membrane drying period is still insufficient. All fabricated membranes were tested with ideal gas permeation test. From the result, the addition of ionic liquid has enhanced the ideal CO2 pemeance about 150% as compared to pure PES membrane. The ideal CO2/CH4 selectivity was also increase about 85% from the base but however, the separation index is still considered low and this may due to the presence of the solvent. This preliminary result has confirmed that the blending of ionic liquid with pure PES membrane has technically improved the membrane separation performance.

Diffusive transport of Cu(II) ions through thin ion imprinted polymeric membranes

2014 ◽  
Vol 68 (10) ◽  
Author(s):  
Soheil Zarghami ◽  
Toraj Mohammadi ◽  
Mansoor Kazemimoghadam
Keyword(s):  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Optimum Conditions ◽  
Compact Structure ◽  
Nickel Ions ◽  
Ion Imprinted ◽  
Permeation Studies ◽  
Solution Casting Method ◽  
Ion Imprinting ◽  
Cu Ions

AbstractA novel ion imprinted polymeric membrane (IIPM) for copper (Cu) ions transport was prepared by a ion imprinting technique via cross-linking of blended chitosan (CS)/polyvinyl alcohol (PVA) using glutaraldehyde (GA) as the cross-linker and Cu ions as the template. The obtained IIPM was characterised and evaluated by scanning electron microscopy (SEM), energy dispersive X-ray (EDX) and permeation studies. Cavities of IIPM containing recognition sites for Cu ions were formed in the compact structure of the CS/PVA membrane which was prepared via the solution casting method. Under the optimum conditions, transport factor of the IIPM reached 2 when the permeation time was 18 h. Selective permeation of Cu ions versus nickel ions through the imprinted membrane was confirmed and a selectivity factor of 1.71 was obtained.

scholarly journals The prospect of synthesis of PES/PEG blend membranes using blend NMP/DMF for CO2/N2 separation

2021 ◽  
Vol 28 (5) ◽  
Author(s):  
Fadel Abdul Hadi Juber ◽  
Zeinab Abbas Jawad ◽  
Bridgid Lai Fui Chin ◽  
Swee Pin Yeap ◽  
Thiam Leng Chew
Keyword(s):  
Gas Separation ◽  
Carbon Capture ◽  
Membrane Separation ◽  
Carbon Capture And Storage ◽  
Polymeric Membranes ◽  
Polymeric Membrane ◽  
Mixed Matrix Membranes ◽  
Separation Performance ◽  
Trade Off ◽  
Blend Membranes

AbstractCarbon dioxide (CO2) emissions have been the root cause for anthropogenic climate change. Decarbonisation strategies, particularly carbon capture and storage (CCS) are crucial for mitigating the risk of global warming. Among all current CO2 separation technologies, membrane separation has the biggest potential for CCS as it is inexpensive, highly efficient, and simple to operate. Polymeric membranes are the preferred choice for the gas separation industry due to simpler methods of fabrication and lower costs compared to inorganic or mixed matrix membranes (MMMs). However, plasticisation and upper-bound trade-off between selectivity and permeability has limited the gas separation performance of polymeric membranes. Recently, researchers have found that the blending of glassy and rubbery polymers can effectively minimise trade-off between selectivity and permeability. Glassy poly(ethersulfone) (PES) and rubbery poly(ethylene) glycol (PEG) are polymers that are known to have a high affinity towards CO2. In this paper, PEG and PES are reviewed as potential polymer blend that can yield a final membrane with high CO2 permeance and CO2/nitrogen (N2) selectivity. Gas separation properties can be enhanced by using different solvents in the phase-inversion process. N-Methyl-2-Pyrrolidone (NMP) and Dimethylformamide (DMF) are common industrial solvents used for membrane fabrication. Both NMP and DMF are reviewed as prospective solvent blend that can improve the morphology and separation properties of PES/PEG blend membranes due to their effects on the membrane structure which increases permeation as well as selectivity. Thus, a PES/PEG blend polymeric membrane fabricated using NMP and DMF solvents is believed to be a major prospect for CO2/N2 gas separation.

Sign in / Sign up

Export Citation Format

Share Document