scholarly journals Earliest Results in the Use of Activated Composite Membranes for the Transport of Silver Ions from Aqueous Solutions

2014 ◽  
Vol 2014 ◽  
pp. 1-5
Author(s):  
Yucundo Mendoza-Tolentino ◽  
Carlos Andrés Galán-Vidal ◽  
Giaan Arturo Álvarez-Romero ◽  
M. T. Ramírez-Silva ◽  
Ma. Elena Páez-Hernández
Keyword(s):  
Phase Inversion ◽  
Interfacial Polymerization ◽  
Silver Ions ◽  
Composite Membranes ◽  
Nonwoven Fabric ◽  
Dense Layer ◽  
Optimal Conditions ◽  
Membrane Phase ◽  
Dithiophosphoric Acid ◽  
Fundamental Parameters

This paper presents the results concerning the first use of activated composite membranes (ACMs) for the facilitated transport of silver ions containing di-(2-ethylhexyl)-dithiophosphoric acid (DTPA) as the carrier. DTPA was immobilized by interfacial polymerization in a dense layer that was deposited in a porous layer, which was prepared on a nonwoven fabric support by phase inversion. The influence of fundamental parameters affecting the transport of silver ion as the carrier concentration in the membrane phase and stripping agent variation of the stripping solution have been studied. In the optimal conditions, the amount of silver transported across the ACMs was greater than 50%, whereas if the content of the carrier is modified, more than the 90% of the initial silver is removed from the feed phase.

scholarly journals Thin Film Nanofibrous Composite Membrane for Dead-End Seawater Desalination

2016 ◽  
Vol 2016 ◽  
pp. 1-12 ◽  
Author(s):  
Baturalp Yalcinkaya ◽  
Fatma Yalcinkaya ◽  
Jiri Chaloupek
Keyword(s):  
Thin Film ◽  
Active Layer ◽  
Composite Membrane ◽  
Interfacial Polymerization ◽  
Composite Membranes ◽  
Nanofibrous Scaffold ◽  
Filtration Method ◽  
Salt Ions ◽  
Dead End ◽  
Supporting Material

The aim of the study was to prepare a thin film nanofibrous composite membrane utilized for nanofiltration technologies. The composite membrane consists of a three-layer system including a nonwoven part as the supporting material, a nanofibrous scaffold as the porous surface, and an active layer. The nonwoven part and the nanofibrous scaffold were laminated together to improve the mechanical properties of the complete membrane. Active layer formations were done successfully via interfacial polymerization. A filtration test was carried out using solutions of MgSO4, NaCl, Na2SO4, CaCl2, and real seawater using the dead-end filtration method. The results indicated that the piperazine-based membrane exhibited higher rejection of divalent salt ions (>98%) with high flux. In addition, them-phenylenediamine-based membrane exhibited higher rejection of divalent and monovalent salt ions (>98% divalent and >96% monovalent) with reasonable flux. The desalination of real seawater results showed that thin film nanofibrous composite membranes were able to retain 98% of salt ions from highly saline seawater without showing any fouling. The electrospun nanofibrous materials proved to be an alternative functional supporting material instead of the polymeric phase-inverted support layer in liquid filtration.

scholarly journals Supercritical Phase Inversion: A Powerful Tool for Generating Cellulose Acetate-AgNO3 Antimicrobial Membranes

Materials ◽  
2020 ◽  
Vol 13 (7) ◽  
pp. 1560
Author(s):  
Lucia Baldino ◽  
Stefano Cardea ◽  
Ernesto Reverchon
Keyword(s):  
Cellulose Acetate ◽  
Phase Inversion ◽  
Active Agent ◽  
Composite Membranes ◽  
Time Interval ◽  
Membrane Pore ◽  
Supercritical Phase ◽  
Silver Nitrate Concentration ◽  
Membrane Pore Size ◽  
Silver Release

Antimicrobial composite membranes, formed by cellulose acetate loaded with AgNO3 particles, were produced by supercritical phase inversion. Different cellulose acetate concentrations were tested (15%, 20%, 30%(w/w)), whereas the active agent (i.e., silver nitrate) concentration was fixed at 0.1%(w/w) with respect to the quantity of polymer used. To determine the influence of the process parameters on membranes morphology, the pressure and temperature were varied from 150 to 250 bar and from 55 to 35 °C, respectively. In all cases, regularly porous membranes were produced with a uniform AgNO3 distribution in the membrane matrix. Silver release rate depended on membrane pore size, covering a time interval from 8 to 75 h.

Ultrathin Film Composite Membranes Fabricated by Novel In Situ Free Interfacial Polymerization for Desalination

2020 ◽  
Vol 12 (22) ◽  
pp. 25304-25315 ◽  
Author(s):  
Chi Jiang ◽  
Liping Zhang ◽  
Peng Li ◽  
Haixiang Sun ◽  
Yingfei Hou ◽  
...  
Keyword(s):  
Interfacial Polymerization ◽  
Composite Membranes ◽  
Ultrathin Film ◽  
Film Composite

Single step fabrication of polymer/silicate porous composite membranes via water-glass induced phase inversion

2018 ◽  
Vol 58 (9) ◽  
pp. 957-966
Author(s):  
Eleni Kollia ◽  
George Mastrotheodoros ◽  
Vasiliki Kosma ◽  
Konstantinos G. Beltsios
Keyword(s):  
Water Glass ◽  
Phase Inversion ◽  
Composite Membranes ◽  
Single Step ◽  
Porous Composite

Nanofibrous hydrogel composite membranes with ultrafast transport performance for molecular separation in organic solvents

2019 ◽  
Vol 7 (33) ◽  
pp. 19269-19279 ◽  
Author(s):  
Yi Li ◽  
Eric Wong ◽  
Alexander Volodine ◽  
Chris Van Haesendonck ◽  
Kaisong Zhang ◽  
...  
Keyword(s):  
Organic Solvents ◽  
Interfacial Polymerization ◽  
Composite Membranes ◽  
Hydrogel Composite ◽  
Molecular Separation ◽  
Solvent Permeation

A polyamide (PA) nanofilm was successfully fabricated on the nanofibrous hydrogel support via controlled interfacial polymerization (IP) and exhibited an unprecedented solvent permeation for various organic solvents.

Influence of Silver Loaded Antibacterial Agent on Knitted and Nonwoven Fabrics and Some Fabric Properties

2016 ◽  
Vol 11 (1) ◽  
pp. 155892501601100 ◽  
Author(s):  
Ramazan Erdem ◽  
Subbiyan Rajendran
Keyword(s):  
Silver Ions ◽  
Antimicrobial Effect ◽  
Nonwoven Fabric ◽  
Antimicrobial Treatment ◽  
Positive Bacterium ◽  
Knitted Fabrics ◽  
Nonwoven Fabrics ◽  
Spray Technique ◽  
Scouring Process ◽  
Antimicrobial Effectiveness

The antibacterial effect of silver on knitted and nonwoven structures has been investigated. Three types of interlocked knitted fabrics (100% polyester, 100% viscose and 50%/50% polyester/viscose) were scoured and treated with silver ions by pad-dry-cure method. A nonwoven fabric (100% bleached cotton) was also treated with silver ions by using a spray technique. Physical and tensile properties of the treated fabrics were analyzed and compared with those of corresponding untreated ones. Results indicate that scouring process and antimicrobial treatment influenced the physical properties and antimicrobial effectiveness of the fabrics. An increase in tensile strength of 100% polyester and 100% viscose is observed after the antimicrobial treatment. The absorbency of all the treated knitted fabrics is decreased but it is substantially increased in the case of nonwoven fabrics. Antimicrobial activity of the treated fabrics was tested against Gram-positive bacterium Staphylococcus aureus. The results show that the treated nonwoven and blended (50%/50% polyester/viscose) knitted fabrics registered highest antimicrobial effect.

Sign in / Sign up

Export Citation Format

Share Document