Iono-molecular Separation with Composite Membranes VI. Nitro-phenol separation through sulfonated polyether ether ketone on capillary polypropylene membranes

2018 ◽  
Vol 69 (7) ◽  
pp. 1603-1607
Author(s):  
Ion Spiridon Din ◽  
Anca Maria Cimbru ◽  
Abbas Abdul Kadhim Klaif Rikabi ◽  
Szidonia Katalin Tanczos ◽  
Simona Ticu (Cotorcea) ◽  
...  
Keyword(s):  
Flow Rate ◽  
Water Solubility ◽  
Composite Membranes ◽  
Membrane System ◽  
Polyether Ether Ketone ◽  
Molecular Separation ◽  
Capillary Membrane ◽  
Sulfonated Polyether Ether Ketone ◽  
Source Phase ◽  
Receptor Phase

The importance of removing and / or separating nitro phenols from aqueous solutions through membranes is substantiated by the multitude of recent research in the field, which broadly justifies both the economic and ecological reasons of such an approach. The present paper outlines the results of the transfer of nitro phenols through a membrane system made up of PPET impregnated polypropylene capillaries (PP) impregnated with sulfonate polyetheretherketone (SPEEK). The experiments were carried out in a PP-SPEEK capillary membrane module, with a useful size of 1 m2. Determinations made by using a 4 L / min flow rate source at a 5 mg / l nitrophenol concentration and pH 5 or pH 7, and the pH 12 receiving phase and a flow rate of 0.3 L / min, revealed that o- and p-nitrophenol were transferred much faster than m-nitrophenol (the flux is nearly double); the source phase of the system is concentrated in m-nitrophenol, and the receptor phase in o- and p-nitro phenols; the transfer data correlates with the higher water solubility of m-nitrophenol; mono nitro phenols transfer much faster than di nitrophenol, but both the mono and di nitrophenol streams decrease over time; after 4-5 hours of work, the mono nitrophenol concentration triples in the receiving phase, while the 2,4-dinitrophenol concentration doubles in the source phase.

scholarly journals Proton conducting electrospun sulfonated polyether ether ketone graphene oxide composite membranes

RSC Advances ◽  
2017 ◽  
Vol 7 (84) ◽  
pp. 53481-53491 ◽  
Author(s):  
Jose Luis Reyes-Rodriguez ◽  
Jorge Escorihuela ◽  
Abel García-Bernabé ◽  
Enrique Giménez ◽  
Omar Solorza-Feria ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Composite Membranes ◽  
Proton Conducting ◽  
Oxide Composite ◽  
Polyether Ether Ketone ◽  
Sulfonated Polyether Ether Ketone ◽  
Ether Ketone ◽  
Sulfonated Poly

A series of novel composite membranes, based on sulfonated poly(ether ketone) (SPEEK) with a graphene oxide (GO) layer, were prepared.

Proton Conducting Electrolyte Membranes based on Tungsten Oxide and Sulfonated Polyether Ether Ketone Hybrid Composites

2005 ◽  
Vol 885 ◽  
Author(s):  
Barbara Mecheri ◽  
Alessandra D'Epifanio ◽  
Maria Luisa Di Vona ◽  
Enrico Traversa ◽  
Silvia Licoccia ◽  
...  
Keyword(s):  
Tungsten Oxide ◽  
Proton Conductivity ◽  
Electrochemical Impedance ◽  
Hybrid Composites ◽  
Composite Membranes ◽  
Proton Exchange ◽  
The Body ◽  
Polyether Ether Ketone ◽  
Sulfonated Polyether Ether Ketone ◽  
Ether Ketone

ABSTRACTComposite membranes, prepared by mixing sulfonated polyether ether ketone (SPEEK) and WO3·2H2O in dimethylacetamide, were characterized by Thermogravimetry, Electrochemical Impedance Spectroscopy and Water Uptake measurements to evaluate their possible performance as proton exchange membranes (PEM). The body of results indicated the existence of a coordinative interaction between the water molecules of tungsten oxide and the sulfonic acid (-SO3H) groups of SPEEK. Moreover, EIS data demonstrated that the proton conductivity of the composite membranes is higher than both that of pure SPEEK and pure tungsten oxide, suggesting the presence of ion-rich regions where the proton transfer is favored. The SO3H - H2O interaction not only lead to enhancement of the proton conductivity of the membranes but also to improvement of their heat resistance as well as to decrease their water solubility.

Performances of Sulfonated Polyether Ether Ketone Composite Membranes for Fuel Cell Applications

2015 ◽  
Vol 14 (01n02) ◽  
pp. 1460016 ◽  
Author(s):  
Jun Ma ◽  
Dongyun Su ◽  
Hongjun Ni ◽  
Mingyu Huang ◽  
Xingxing Wang
Keyword(s):  
Fuel Cell ◽  
Composite Membranes ◽  
Exchange Capacity ◽  
Proton Exchange ◽  
Methanol Permeability ◽  
Ion Exchange Capacity ◽  
Polyether Ether Ketone ◽  
Fuel Cell Application ◽  
Sulfonated Polyether Ether Ketone ◽  
Ether Ketone

A variety of modification approaches such as cross-linking and nano blending have been explored to prepare efficient membranes based on Sulfonated polyether ether ketone (SPEEK). The addition filler is also one of the most widely used approaches to modify the SPEEK. The crosslinked membranes were utilized as proton exchange membranes (PEM) for fuel cell application. The performances of these composite membranes were comparative researched in terms of water uptake, ion exchange capacity, proton conductivity, and methanol permeability.While the nanohybrid membranes display remarkably enhanced proton conduction property due to the incorporation of additional sites for proton transport and the formation of well-connected channels by bridging the hydrophilic domains in SPEEK matrix. The as-prepared nanohybrid membranes also show elevated thermal and mechanical stabilities as well as decreased methanol permeability.

Iono-molecular Separation with Composite Membranes V. Nitro-phenol separation on n-alkyl alcohols supported liquid membranes

2018 ◽  
Vol 69 (5) ◽  
pp. 1084-1088
Author(s):  
Ion Spiridon Din ◽  
Anca Maria Cimbru ◽  
Hussam Nadum Abdalraheem Al Ani ◽  
Ion Marius Nafliu ◽  
Szidonia Katalin Tanczos ◽  
...  
Keyword(s):  
Working Conditions ◽  
Separation Efficiency ◽  
Composite Membranes ◽  
Liquid Membranes ◽  
Phase Flow ◽  
Optimal Parameters ◽  
Supported Liquid Membranes ◽  
Molecular Separation ◽  
Source Phase ◽  
Maximum Separation

In this work are ongoing recent related studies on the separation of nitrophenols by composite membranes using this time an HFCLM membrane based on n-lower alkyl alcohols (C6, C8 si C10) on a well-characterized tubular polypropylene support . The results of nitrophenol separation, at a concentration of 5 mg / L in the source phase of pH 4.8, indicate the following optimal parameters of hydrodynamic regime, solvent and pH: source phase flow of 4.0 L / min, receiver phase rate 0.3 L / min; n-octanol, membrane solvent; the pH of the receiving phase that ensures maximum separation efficiency between 10 and 11; pH that ensures selective separation of m- and p-nitrophenols from m-nitrophenol between 8 and 10.The efficiency of nitrophenol separation through polypropylene capillary polymeric n-alcohol composite membranes reaches more than 90% at established working conditions, but operation below pH 12 will be considered in order not to cause membrane instability on the support.

scholarly journals Transport Properties and Mechanical Features of Sulfonated Polyether Ether Ketone/Organosilica Layered Materials Nanocomposite Membranes for Fuel Cell Applications

Membranes ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 87 ◽  
Author(s):  
Cataldo Simari ◽  
Apostolos Enotiadis ◽  
Isabella Nicotera
Keyword(s):  
Fuel Cell ◽  
Mechanical Strength ◽  
Transport Properties ◽  
Proton Conductivity ◽  
Composite Membranes ◽  
Significant Advance ◽  
Nanocomposite Membranes ◽  
Polyether Ether Ketone ◽  
Sulfonated Polyether Ether Ketone ◽  
Ether Ketone

In this work, we study the preparation of new sulfonated polyether ether ketone (sPEEK) nanocomposite membranes, containing highly ionic silica layered nanoadditives, as a low cost and efficient proton exchange membranes for fuel cell applications. To achieve the best compromise among mechanical strength, dimensional stability and proton conductivity, sPEEK polymers with different sulfonation degree (DS) were examined. Silica nanoplatelets, decorated with a plethora of sulfonic acid groups, were synthesized through the one-step process, and composite membranes at 1, 3 and 5 wt% of filler loadings were prepared by a simple casting procedure. The presence of ionic layered additives improves the mechanical strength, the water retention capacity and the transport properties remarkably. The nanocomposite membrane with 5% wt of nanoadditive exhibited an improvement of tensile strength almost 160% (68.32 MPa,) with respect to pristine sPEEK and a ten-times higher rate of proton conductivity (12.8 mS cm−1) under very harsh operative conditions (i.e., 90 °C and 30% RH), compared to a filler-free membrane. These findings represent a significant advance as a polymer electrolyte or a fuel cell application.

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