The adsorption of quadrivalent cerium by kaolinite

Clay Minerals ◽  
1984 ◽  
Vol 19 (2) ◽  
pp. 137-149 ◽  
Author(s):  
F. Laufer ◽  
S. Yariv ◽  
M. Steinberg
Keyword(s):  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Sulphuric Acid ◽  
Ceric Ammonium Nitrate ◽  
Equilibrium System ◽  
Monomeric Species ◽  
Clay Surface ◽  
Polymeric Species

AbstractThe adsorption of cerium(IV) by both natural and Na-exchanged kaolinite from aqueous solutions of ceric ammonium nitrate was studied in equilibrium systems. Cerium may be adsorbed either as a monomeric species or as a polymeric hydroxy cation. The species adsorbed depends on the concentration of cerium in the stock solution, the age of this solution prior to the preparation of the equilibrium system and on the equilibration period. Adsorbed cations undergo polymerization on the surface of the kaolinite; the resulting polymeric species forms strong bonds with the clay surface—it is not desorbed by sulphuric acid—and may be considered fixed. Adsorption of cerium reaches a maximum in solutions containing 0·15 M sulphuric acid.

scholarly journals Synthesis of chitosan and N-vinylimidazole graft-copolymers and the properties of their aqueous solutions

2021 ◽  
Vol 23 (4) ◽  
pp. 570-577
Author(s):  
Andrey V. Sorokin ◽  
Marina G. Kholyavka ◽  
Maria S. Lavlinskaya
Keyword(s):  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Graft Copolymers ◽  
Gel Permeation Chromatography ◽  
Water Soluble ◽  
Ceric Ammonium Nitrate ◽  
Transmission Electron ◽  
Redox Initiator ◽  
Self Association ◽  
Stimuli Sensitive

The aim of this work is to synthesise chitosan and N-vinylimidazole graft-copolymers of various compositions and to study the properties of their aqueous solutions.Chitosan and N-vinylimidazole graft-copolymers were obtained by solution polymerisation in the presence of a ceric ammonium nitrate redox initiator. The synthesised graft copolymers were characterised by FTIR to determine their compositions and the grafted side chains of poly-N-vinylimidazole were characterised by gel permeation chromatography to determine their molecular wights and polydispersity indices. It was established that the obtained products are characterised by high values of yield and grafting efficiency and low values of the polydispersity index. It was found that when the content of the N-vinylimidazole links is above 57 wt%, the synthesised graft copolymers are water-soluble. Aqueous solutions of the obtained copolymers were characterised using dynamic light scattering, transmission electron microscopy, and laserDoppler microelectrophoresis. The study showed that macromolecules of graft copolymers in aqueous solutions have stimuli-sensitive properties with respect to the medium reaction and at a concentration above 10–2 wt% are characterised by a tendency to self-association forming core-crown aggregates, the geometry of which depends on the molecular masses of the grafted chains. Associates of macromolecules in solutions are characterised by positive values of the electrokinetic potential, the values of which also depend on the medium reaction. Thus, it was found that the ceric ammonium nitrate initiator allows obtaining chitosan and N-vinylimidazole graft-copolymers showing stimuli-sensitive properties in aqueous solutions and prone to self-association at concentrations above 10–2 wt%.

Viscosity, electrical conductivity and density of the system ammonium nitrate-dimethyl sulphoxide

1984 ◽  
Vol 49 (5) ◽  
pp. 1109-1115
Author(s):  
Jindřich Novák ◽  
Zdeněk Kodejš ◽  
Ivo Sláma
Keyword(s):  
Electrical Conductivity ◽  
Aqueous Solutions ◽  
Ammonium Nitrate ◽  
Transport Properties ◽  
Calcium Nitrate ◽  
Dimethyl Sulphoxide ◽  
Present System ◽  
Empirical Equations ◽  
Concentrated Solutions ◽  
Nitrate Solutions

The density, viscosity, and electrical conductivity of highly concentrated solutions of ammonium nitrate in dimethyl sulphoxide have been determined over the temperature range 10-60 °C and the concentration range 7-50 mol% of the salt. The variations in the quantities as a function of temperature and concentration have been correlated by empirical equations. A comparison is made between the transport properties for the present system, aqueous solutions of ammonium nitrate, and calcium nitrate solutions in dimethyl sulphoxide.

ChemInform Abstract: Oxidation of 4-methoxyanilines to 1,4-Benzoquinones Using Ceric Ammonium Nitrate (CAN).

ChemInform ◽  
2011 ◽  
Vol 42 (15) ◽  
pp. no-no
Author(s):  
Yugang Chen ◽  
Weijiang Ying ◽  
Michael Harmata
Keyword(s):  
Ammonium Nitrate ◽  
Ceric Ammonium Nitrate

OXIDATIVE REMOVAL OFN-(p-METHOXYBENZYL) GROUP ON DIKETOPIPERAZINE SKELETON WITH CERIC AMMONIUM NITRATE

1983 ◽  
Vol 12 (7) ◽  
pp. 1001-1002 ◽  
Author(s):  
Juji Yoshimura ◽  
Masanori Yamaura ◽  
Tsuneji Suzuki ◽  
Hironobu Hashimoto
Keyword(s):  
Ammonium Nitrate ◽  
Ceric Ammonium Nitrate ◽  
Oxidative Removal

scholarly journals Synthesis of 4,7-indolequinones. The oxidative demethylation of 4,7-dimethoxyindoles with ceric ammonium nitrate.

1985 ◽  
Vol 33 (5) ◽  
pp. 2122-2128 ◽  
Author(s):  
YOSHIYASU KITAHARA ◽  
SHINSUKE NAKAHARA ◽  
RYUICHI NUMATA ◽  
AKINORI KUBO
Keyword(s):  
Ammonium Nitrate ◽  
Ceric Ammonium Nitrate ◽  
Oxidative Demethylation

Deprotection of benzaldehyde diacetates by ceric ammonium nitrate coated on silica

1992 ◽  
Vol 33 (27) ◽  
pp. 3855-3858 ◽  
Author(s):  
Philippe Cotelle ◽  
Jean-Pierre Catteau
Keyword(s):  
Ammonium Nitrate ◽  
Ceric Ammonium Nitrate
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