Sorption Purification of Aqueous Ammonium Molybdate To Remove Tungsten Impurities with a Cation Exchanger Containing Pyrocatechol Functional Groups

2005 ◽  
Vol 78 (3) ◽  
pp. 422-424 ◽  
Author(s):  
A. A. Blokhin ◽  
L. G. Kaloshina ◽  
N. Ya. Lyubman ◽  
Yu. V. Murashkin
Keyword(s):  
Functional Groups ◽  
Cation Exchanger ◽  
Ammonium Molybdate ◽  
Sorption Purification

Unique and outstanding cadmium sequestration by polystyrene-supported nanosized zirconium hydroxides: a case study

RSC Advances ◽  
2015 ◽  
Vol 5 (68) ◽  
pp. 55445-55452 ◽  
Author(s):  
Qingrui Zhang ◽  
Jie Teng ◽  
Zhaoxiang Zhang ◽  
Guangze Nie ◽  
Hongwei Zhao ◽  
...  
Keyword(s):  
Functional Groups ◽  
Cation Exchanger ◽  
Highly Efficient ◽  
Hybrid Sorbent

We developed a new hybrid sorbent (HZO-PS) by loading nano-Zr(OH)4 within a cation-exchanger. HZO-PS can combine the strong sorption affinities of HZO and charged functional groups (R–SO3−) enrichment of matrix for highly efficient Cd(ii) removal.

scholarly journals Bilayer capillary coatings based on nanosized ion-exchangers for the capillary electrochromatography analyses of biogenic amines and amino acids

2021 ◽  
Vol 25 (3) ◽  
pp. 230-240
Author(s):  
D. V. Makeeva ◽  
◽  
D. A. Polikarpova ◽  
L. A. Kartsova ◽  
◽  
...  
Keyword(s):  
Amino Acids ◽  
Functional Groups ◽  
Capillary Electrochromatography ◽  
Cation Exchanger ◽  
Physical Adsorption ◽  
Stationary Phases ◽  
Layer By Layer ◽  
Ion Exchangers ◽  
High Concentration ◽  
Capillary Walls

Nanoparticles are widely used in capillary electrophoresis as stationary phases adsorbed on the internal capillary walls for the separation and concentration of analytes in capillary electrochromatography. The fastest and simplest approach for the formation of coatings is a physical adsorption of nanoparticles. Nevertheless, the formed coatings frequently possess low stability. The layer-by-layer approach for the formation of stabile and dense coating of internal capillary walls based on negatively charged nanosized cation-exchanger was proposed. The method included the sequential alteration of appositively charged layers of nanosized ion-exchangers. The proposed “anion-exchanger – cation-exchanger” bilayer coating possesses high stability in wide pH range (2-10) and provides up to 120 analyses without the need of re-coating. The coating was applied for the separation and on-line concentration of catecholamines and amino acids in capillary electrochromatography mode. High efficiencies were achieved (N = 450-720 th. t.p./m and N = 400-520 th. t.p./m for cathecholamies and amino acids, respectively), while the analysis time was significantly decreased. It was established, that high concentration of negatively charged functional groups on the capillary surface led to the increase of stacking efficiency factors due to the interactions between analytes and functional groups of the modifier on the capillary walls. It contributed to the 2-4 times reduced detection limits (LODs) of analytes compared to the mono-layer coatings (LODs of catecholamines = 3-4 ng/mL, LODs of amino acids = 40-100 ng/mL).

Sorption of Lead and Cadmium on Ostsorb P and Ostsorb SA-5 Cellulose Sorbents

1992 ◽  
Vol 57 (10) ◽  
pp. 2089-2094 ◽  
Author(s):  
Ladislav Svoboda ◽  
Leona Čáňová
Keyword(s):  
Ionic Strength ◽  
Functional Groups ◽  
Cation Exchanger ◽  
Exchange Capacity ◽  
Low Ph ◽  
The Other ◽  
Ph Values ◽  
Lead And Cadmium ◽  
Acid Fragment ◽  
Bead Cellulose

The effect of pH and ionic strength on the exchange capacity of sorbents based on modified bead cellulose was examined for the sorption of Pb2+ and Cd2+ ions. Ion exchange of these cations in aqueous solutions is nonselective on Ostsorb SA-5, which is cellulose containing functional groups based on H-acid. The medium acidic Ostsorb P cation exchanger with functional groups formed by the phosphoric acid fragment, on the other hand, sorbs lead, and to a lesser extent also cadmium, also at high ionic strengths of the medium even at low pH values.

Improving integration between functional groups: A case in organization change and implications for theory and practice

1971 ◽  
Author(s):  
Warren G. Bennis ◽  
Michael Beer ◽  
Gerald R. Pieters ◽  
Alan T. Hundert ◽  
Samuel H. Marcus ◽  
...  
Keyword(s):  
Functional Groups ◽  
Organization Change ◽  
Theory And Practice

HYDROXYAPATITE, ALGINATE, AND CHITOSAN FOR BONE SCAFFOLDS: SPECTROSCOPY STUDY

2016 ◽  
Vol 19 (2) ◽  
pp. 93-100
Author(s):  
Lalita El Milla
Keyword(s):  
Tissue Engineering ◽  
Bone Tissue Engineering ◽  
Bone Tissue ◽  
Functional Groups ◽  
Bone Growth ◽  
Three Dimensional ◽  
Dimensional Structure ◽  
Tissue Engineering Scaffolds ◽  
Hydroxyapatite Powder ◽  
Materials Used

Scaffolds is three dimensional structure that serves as a framework for bone growth. Natural materials are often used in synthesis of bone tissue engineering scaffolds with respect to compliance with the content of the human body. Among the materials used to make scafffold was hydroxyapatite, alginate and chitosan. Hydroxyapatite powder obtained by mixing phosphoric acid and calcium hydroxide, alginate powders extracted from brown algae and chitosan powder acetylated from crab. The purpose of this study was to examine the functional groups of hydroxyapatite, alginate and chitosan. The method used in this study was laboratory experimental using Fourier Transform Infrared (FTIR) spectroscopy for hydroxyapatite, alginate and chitosan powders. The results indicated the presence of functional groups PO43-, O-H and CO32- in hydroxyapatite. In alginate there were O-H, C=O, COOH and C-O-C functional groups, whereas in chitosan there were O-H, N-H, C=O, C-N, and C-O-C. It was concluded that the third material containing functional groups as found in humans that correspond to the scaffolds material in bone tissue engineering.

High Resolution Displacement of Functional Groups onto Fluorocarbon Resin Surface by Using ArF Excimer Laser

1996 ◽  
Vol 451 ◽  
Author(s):  
T. Shimizu ◽  
M. Murahara
Keyword(s):  
Contact Angle ◽  
High Resolution ◽  
Laser Beam ◽  
Thin Layer ◽  
Functional Groups ◽  
Excimer Laser ◽  
Laser Fluence ◽  
Large Area ◽  
Three Solutions ◽  
Arf Excimer Laser

ABSTRACTA Fluorocarbon resin surface was selectively modified by irradiation with a ArF laser beam through a thin layer of NaAlO2, B(OH)3, or H2O solution to give a hydrophilic property. As a result, with low fluence, the surface was most effectively modified with the NaAlO2 solution among the three solutions. However, the contact angle in this case changed by 10 degrees as the fluence changed only 1mJ/cm2. When modifying a large area of the surface, high resolution displacement could not be achieved because the laser beam was not uniform in displacing functional groups. Thus, the laser fluence was successfully made uniform by homogenizing the laser beam; the functional groups were replaced on the fluorocarbon resin surface with high resolution, which was successfully modified to be hydrophilic by distributing the laser fluence uniformly.

Visible Light-Promoted Catalytic Ring-Opening Isomerization of 1,2-Disubstituted Cyclopropanols to Linear Ketones

2019 ◽  
Author(s):  
Marharyta V. Laktsevich-Iskryk ◽  
Nastassia A. Varabyeva ◽  
Volha V. Kazlova ◽  
Vladimir N. Zhabinskii ◽  
Vladimir A. Khripach ◽  
...  
Keyword(s):  
Visible Light ◽  
Functional Groups ◽  
Ring Opening ◽  
Radical Intermediates ◽  
Reaction Proceeds

In this article, we report a photocatalytic protocol for the isomerization of 1,2-disubstituted cyclopropanols to linear ketones. The reaction proceeds <i>via</i> radical intermediates and tolerates various functional groups.

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