The effect of the pore structure and zeta potential of porous polymer monoliths on separation performance in ion-exchange mode

2007 ◽  
Vol 30 (5) ◽  
pp. 648-657 ◽  
Author(s):  
Athanasios I. Liapis ◽  
Brian A. Grimes
Keyword(s):  
Ion Exchange ◽  
Zeta Potential ◽  
Pore Structure ◽  
Porous Polymer ◽  
Separation Performance ◽  
Polymer Monoliths

Preparation of Large-Diameter “Molded” Porous Polymer Monoliths and the Control of Pore Structure Homogeneity

1997 ◽  
Vol 9 (8) ◽  
pp. 1898-1902 ◽  
Author(s):  
Eric C. Peters ◽  
Frantisek Svec ◽  
Jean M. J. Fréchet
Keyword(s):  
Pore Structure ◽  
Large Diameter ◽  
Porous Polymer ◽  
Polymer Monoliths

Towards high capacity latex-coated porous polymer monoliths as ion-exchange stationary phases

The Analyst ◽  
2006 ◽  
Vol 131 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Joseph P. Hutchinson ◽  
Emily F. Hilder ◽  
Robert A. Shellie ◽  
Jason A. Smith ◽  
Paul R. Haddad
Keyword(s):  
Ion Exchange ◽  
Stationary Phases ◽  
High Capacity ◽  
Porous Polymer ◽  
Polymer Monoliths

scholarly journals ADSORBATIVE SEPARATION OF DOXYCYCLINE FROM AQUEOUS SOLUTION WITH N,N-DIETHYL N-METHYL CHITOSAN, GUM AND POLYACRYLIC ACID BASED HYDROGELS

2021 ◽  
Vol 11 (07) ◽  
pp. 44-53
Author(s):  
Mirvari Hasanova Mirvari Hasanova
Keyword(s):  
Aqueous Solution ◽  
Ion Exchange ◽  
Zeta Potential ◽  
Polyacrylic Acid ◽  
Inorganic Materials ◽  
Biologically Active ◽  
Cross Linking ◽  
Separation And Purification ◽  
Inorganic Substances ◽  
The Cross

The separation and purification of antibiotics with sorption by ion-exchange materials, as well as their delivery in biological processes by immobilization, are now widely used in biotechnology. There are many scientific studies in the literature on the sorption of antibiotics by polymer-based sorbents and inorganic materials, as well as the study of thermodynamics and kinetics of the process. In the literature, the acquisition of biologically active systems from the sorption of antibiotics by ion-exchange fibers based on various polymers and inorganic substances was carried out. However, the synthesis of selective gels for the effective separation of doxycycline and its delivery in different pH mediums by sorption with biodegradable, biocompatible polysaccharide-containing composites is one of the topical issues. Gel was synthesized from the cross-linking of N,N-diethyl N-methyl derivative of a natural polyaminosaccharide of chitosan by glutaric aldehyde. Also, pH-sensitive hydrogels that can swollen in water were synthesized from the cross-linking of a graft copolymer of cherry source gummiarabic with N-vinylpyrrolidone, as well as synthetic polymer polyacrylic acid with N,N-methylene-bis-acrylamide. The structure of the gels were identified by FTIR and NMR spectroscopy, and the sorption of doxycycline antibiotic from an aqueous solution was investigated. According to the values of zeta potential, the protonation of functional groups in the main macromolecule in an acidic medium leads to a value of zeta potential of 40÷80 mV on the surface of chitosan-based gel and others. Although the chemical structure is different, the isoelectric point is set around pH=6÷8 for all three hydrogels. The dependences of the sorption process on the amount of gels, antibiotic concentration, temperature, and pH medium were studied. The experimental data were analyzed using two adsorption models, Langmuir and Freundlich, with the later system providing the best fit. Doxycycline is adsorbed on the surface of chitosan, gummiarabic and polyacrylic acid based hydrogel composite through by physical interactions. Also, the results of thermodynamic parameters ΔG40 kJ/mol show that the nature of the adsorption process is physical, and spontaneous, too. Keywords: Chitosan, Gummiarabic-arabinogalactane, polyacrylic acid, hydrogel, sorption isoterms, doxycycline, thermodynamica.

scholarly journals Semi-Continuous Desalination and Concentration of Small-Volume Samples

2021 ◽  
Vol 22 (23) ◽  
pp. 12904
Author(s):  
David Tichý ◽  
Zdeněk Slouka
Keyword(s):  
Ion Exchange ◽  
Small Volume ◽  
Water Solution ◽  
Microfluidic System ◽  
Separation Performance ◽  
Water Recovery ◽  
Ion Exchange Membranes ◽  
Control Parameters ◽  
Mode Of Operation ◽  
Dc Polarization

Electrodialysis is an electric-field-mediated process separating ions exploiting selective properties of ion-exchange membranes. The ion-exchange membranes create an ion-depleted zone in an electrolyte solution adjacent to the membrane under DC polarization. We constructed a microfluidic system that uses the ion-depleted zone to separate ions from the processed water solution. We tested the separation performance by desalting a model KCl solution spiked with fluorescein for direct observation. We showed both visually and by measuring the conductivity of the output solutions that the system can work in three modes of operation referred to as continuous desalination, desalination by accumulation, and unsuccessful desalination. The mode of operation can easily be set by changing the control parameters. The desalination factors for the model KCl solution reached values from 80 to 100%, depending on the mode of operation. The concentration factor, given as a ratio of concentrate-to-feed concentrations, reached zero for desalination by accumulation when only diluate was produced. The water recovery, therefore, was infinite at these conditions. Independent control of the diluate and concentrate flow rates and the DC voltage turned our system into a versatile platform, enabling us to set proper conditions to process various samples.

Porogens and porogen selection in the preparation of porous polymer monoliths

2019 ◽  
Vol 43 (1) ◽  
pp. 56-69
Author(s):  
Fotouh R. Mansour ◽  
Sidra Waheed ◽  
Brett Paull ◽  
Fernando Maya
Keyword(s):  
Porous Polymer ◽  
Polymer Monoliths

scholarly journals Hierarchically Porous Polymer Monoliths by Combining Controlled Macro- and Microphase Separation

2015 ◽  
Vol 137 (28) ◽  
pp. 8896-8899 ◽  
Author(s):  
Stacey A. Saba ◽  
Maral P. S. Mousavi ◽  
Philippe Bühlmann ◽  
Marc A. Hillmyer
Keyword(s):  
Microphase Separation ◽  
Porous Polymer ◽  
Polymer Monoliths ◽  
Hierarchically Porous

Control of Porous Properties and Surface Chemistry in “Molded” Porous Polymer Monoliths Prepared by Polymerization in the Presence of TEMPO

1999 ◽  
Vol 32 (19) ◽  
pp. 6377-6379 ◽  
Author(s):  
Eric C. Peters ◽  
Frantisek Svec ◽  
Jean M. J. Fréchet ◽  
Camilla Viklund ◽  
Knut Irgum
Keyword(s):  
Surface Chemistry ◽  
Porous Polymer ◽  
Polymer Monoliths ◽  
Porous Properties
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