Polymer Sorbents from “Nitron Fiber Waste”

2021 ◽  
Vol 19 (7) ◽  
pp. 64-71
Author(s):  
M.S. Bobomurodova ◽  
M.A. Ashirov ◽  
D.A. Gafurova ◽  
D.N. Shakhidova ◽  
L.M. Khalilova ◽  
...  
Keyword(s):  
Ir Spectroscopy ◽  
Anion Exchange ◽  
Potentiometric Titration ◽  
Physicochemical Characteristics ◽  
Polymer Sorbents ◽  
Nitron Fiber

New sorbents were synthesized from nitron fiber waste modified with various anion-exchange groups. The structure was studied by potentiometric titration and IR spectroscopy. The possibility ихof using them for immobilizationis shown, andthe physicochemical characteristics of polymer sorbentsare studied.

scholarly journals Hybrid Anion Exchange Hollow Fiber Membrane for Delivery of Ionic Drugs

2012 ◽  
Vol 2012 ◽  
pp. 1-9 ◽  
Author(s):  
Na Wang ◽  
Mengbing Cui ◽  
Cuiming Wu ◽  
Yiyun Cheng ◽  
Tongwen Xu
Keyword(s):  
Hydrogen Bonding ◽  
Anion Exchange ◽  
Hollow Fiber ◽  
Hollow Fiber Membrane ◽  
Drug Carriers ◽  
Physicochemical Characteristics ◽  
Interaction Patterns ◽  
Fiber Membrane ◽  
Phenylene Oxide ◽  
External Phase

Hybrid anion exchange hollow fiber membranes (HAEHFMs) based on bromomethylated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) are proposed as potential drug carriers for four anionic model drugs, including the sodium salts of benzoate (NaBS), salicylate (NaSA), meta-amino salicylate (NaMAS), and loxoprofen (NaLS). The results of the static loading and release experiments suggest that electrostatic interaction, hydrogen bonding, and hydrophobic interaction are the main interaction patterns between the membrane and the drugs. And they are directly influenced by the external phase conditions and the drug physicochemical characteristics, such as structure, molecular weight, dissociation (pKa), and hydrogen bonding capability. Among the four different drugs, NaSA and NaMAS appear to be the most suitable for controlled release by the HAEHFM due to their excellent adsorption/release behaviors.

Anion exchange during pressing of tablets in IR-spectroscopy practice

1978 ◽  
Vol 29 (1) ◽  
pp. 875-877
Author(s):  
A. B. Aleksandrov ◽  
I. A. Vasil'ev ◽  
A. F. Nechaev
Keyword(s):  
Ir Spectroscopy ◽  
Anion Exchange

scholarly journals SORPTION OF AMINO ACID AND CHANGES IN HYDRATION OF HETEROGENEOUS CATION- AND ANION-EXCHANGE MEMBRANES FUMASEP

2018 ◽  
Vol 59 (4) ◽  
pp. 73
Author(s):  
Nina I. Maiygurova ◽  
Frank Roessner ◽  
Tatiana V. Eliseeva ◽  
Vladimir F. Selemenev
Keyword(s):  
Mass Transfer ◽  
Amino Acid ◽  
Ir Spectroscopy ◽  
Acid Solution ◽  
Anion Exchange ◽  
Significant Influence ◽  
Membrane Surface ◽  
Surface Hydrophobicity ◽  
Anion Exchange Membranes ◽  
Amino Acid Solution

Hydration of heterogeneous cation-exchange membranes Fumasep FTCM and anion-exchange membranes Fumasep FTAM in hydrogen and hydroxyl forms, respectively, sorbing tyrosine as well as of the samples being used in electrodialysis concentration of tyrosine solution was studied using the methods of thermogravimetry and IR-spectroscopy. It was revealed that tyrosine sorption and membranes application in electrodialysis of this amino acid solution causes membranes hydration decrease. The decrease in membrane hydration after its contact with tyrosine leads to membrane surface hydrophobicity grow up and, consequently, make significant influence on amino acid’s mass transfer.

scholarly journals Acid-base properties of fibrous polyampholytes with aminodiacetic functional groups

2020 ◽  
Vol 64 (3) ◽  
pp. 300-307
Author(s):  
E. G. Kosandrovich ◽  
P. V. Nesteronok ◽  
L. N. Shachenkova ◽  
V. S. Soldatov
Keyword(s):  
Cation Exchange ◽  
Anion Exchange ◽  
Potentiometric Titration ◽  
Functional Groups ◽  
Supporting Electrolyte ◽  
Experimental Results ◽  
Monochloroacetic Acid ◽  
Polyacrylonitrile Fiber ◽  
Acid Base ◽  
Amination Reaction

Polyampholytes, containing aminodiacetic functional groups, on the base of polyacrylonitrile fiber Nitron C were obtained by the amination reaction of nitrile groups with polyamines (number of repeating units from 1 to 5) and subsequent alkylation with monochloroacetic acid. The experimental results of potentiometric titration and sorption of supporting electrolyte (kCl) ions by synthesized ion exchangers were obtained, which made it possible to determine the acidity parameters of functional groups: the presence of four types of cation exchange and two types of anion exchange groups was detected in polyampholytes, the sequence of their neutralization in the titration process was established.

scholarly journals Synthesis of gemini basic ionic liquids and their application in anion exchange membranes

RSC Advances ◽  
2018 ◽  
Vol 8 (19) ◽  
pp. 10185-10196 ◽  
Author(s):  
Dan Wang ◽  
Yifu Wang ◽  
Heting Wan ◽  
Jilin Wang ◽  
Lulu Wang
Keyword(s):  
Ionic Liquid ◽  
Ionic Liquids ◽  
Ir Spectroscopy ◽  
Anion Exchange ◽  
Raw Materials ◽  
Anion Exchange Membranes ◽  
Step Method ◽  
H Nmr ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

A gemini-type basic morpholine ionic liquid ([Nbmd][OH]) was synthesizedviaa two-step method with morpholine, bromododecane and 1,4-dibromobutane as raw materials, and its structure was characterized by1H NMR and FT-IR spectroscopy.

scholarly journals Obtaining and prospects for the use of hydrazide N-vinylsuccinamic acid copolymers as a carrier of biofunctional substances with directional effect

2019 ◽  
pp. 8-10
Author(s):  
L. I. Shal’nova ◽  
N. A. Lavrov
Keyword(s):  
Ir Spectroscopy ◽  
Hydrazine Hydrate ◽  
Potentiometric Titration ◽  
Vinyl Acetate ◽  
Elemental Analysis ◽  
Acid Hydrazide ◽  
Water Soluble ◽  
Directional Effect ◽  
Acidic Nature

Water-soluble (co) polymers of N-vinylsuccinamic acid hydrazide are obtained as a result of polymer-analogous transformations in the interaction of hydrazine-hydrate of vinyl acetate copolymers with vinyl succinimide and polyvinyl succinimide. Using IR spectroscopy, potentiometric titration, elemental analysis, their structure and composition were established. The possibility of using copolymers as carriers of biofunctional substances of an acidic nature is shown.

Applications of SEM/EDXA in cement clinker investigation

1990 ◽  
Vol 48 (4) ◽  
pp. 870-871
Author(s):  
Arezki Tagnit-Hamou ◽  
Shondeep L. Sarkar
Keyword(s):  
Mineralogical Composition ◽  
Physicochemical Characteristics ◽  
Cement Clinker ◽  
Accurate Information ◽  
Phase Identification ◽  
History Of ◽  
Bulk Chemical ◽  
Resolution Imaging ◽  
Proven Method ◽  
Instantaneous Chemical

All the desired properties of cement primarily depend on the physicochemical characteristics of clinker from which the cement is produced. The mineralogical composition of the clinker forms the most important parameter influencing these properties.Optical microscopy provides reasonably accurate information pertaining to the thermal history of the clinker, while XRDA still remains the proven method of phase identification, and bulk chemical composition of the clinker can be readily obtained from XRFA. Nevertheless, all these microanalytical techniques are somewhat limited in their applications, and SEM/EDXA combination fills this gap uniquely by virtue of its high resolution imaging capability and possibility of instantaneous chemical analysis of individual phases.Inhomogeneities and impurities in the raw meal, influence of kiln conditions such as sintering and cooling rate being directly related to the microstructure can be effectively determined by SEM/EDXA. In addition, several physical characteristics of cement, such as rhcology, grindability and hydraulicity also depend on the clinker microstructure.

Common modifications of selenocysteine in selenoproteins

2019 ◽  
Vol 64 (1) ◽  
pp. 45-53 ◽  
Author(s):  
Elias S.J. Arnér
Keyword(s):  
Amino Acids ◽  
Covalent Binding ◽  
Physicochemical Characteristics ◽  
Redox Active

Abstract Selenocysteine (Sec), the sulfur-to-selenium substituted variant of cysteine (Cys), is the defining entity of selenoproteins. These are naturally expressed in many diverse organisms and constitute a unique class of proteins. As a result of the physicochemical characteristics of selenium when compared with sulfur, Sec is typically more reactive than Cys while participating in similar reactions, and there are also some qualitative differences in the reactivities between the two amino acids. This minireview discusses the types of modifications of Sec in selenoproteins that have thus far been experimentally validated. These modifications include direct covalent binding through the Se atom of Sec to other chalcogen atoms (S, O and Se) as present in redox active molecular motifs, derivatization of Sec via the direct covalent binding to non-chalcogen elements (Ni, Mb, N, Au and C), and the loss of Se from Sec resulting in formation of dehydroalanine. To understand the nature of these Sec modifications is crucial for an understanding of selenoprotein reactivities in biological, physiological and pathophysiological contexts.

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