Wyniki wyszukiwania - BazTech

Ograniczanie wyników

Powiadomienia systemowe

Sesja wygasła!
Sesja wygasła!
Sesja wygasła!

Znaleziono wyników: 3

Liczba wyników na stronie

Wyniki wyszukiwania

Wyszukiwano:
w słowach kluczowych: phosphonium salts

Sortuj według:

Ogranicz wyniki do:

Investigation of adsorption behavior of phosphonium salts onto Na-montmorillonite

Cinku K., Baysal B.

Physicochemical Problems of Mineral Processing

2014

Vol. 50, iss. 2

417--432

Montmorillonite is an important clay mineral due to its cation exchange capacity and technological properties such as swelling and gelling. It has been widely used in many scientific applications like organoclay. Adsorption studies, involving montmorillonite in the presence of variety of organic compounds, like ammonium and phosphonium salts, are very important because of their application in organoclay and polymer nanocomposites. These materials have a high thermal resistivity. Different types of phosphonium salts, including hexadecyl triphenyl phosphonium bromide (HTPB), hexadecyl tributyl phosphonium bromide (HTBPB), and tetraphenyl phosphonium bromide (TPB), were used to investigate their adsorption on Na-montmorillonite. They have different structures and TPB contains only one aromatic part without any organic chain, HTBPB possess an organic chain with three branches while HTPB has an organic chain and an aromatic part. The adsorption of the surfactants was supplemented with other properties such as zeta potential, surface tension, and ability to flocculation. The results indicated that the adsorption behavior of these surfactants depended on their structure.

Polycations. Part 16. Polyphosphonium Species Containing Phosphorus-Phosphorus Bonds

Massone Ch., Engel R.

Polish Journal of Chemistry

2005

Vol. 79 / nr 3

481-485

This effort has had as its focus the generation of analogues of phosphoric acid amides in which phosphorus is present in place of the usual nitrogen on an amide species. Of particular interest for us have been such phosphorus analogues of quaternary amides in which a phosphonium site is directly attached to the phosphorus of each parent acidic site. The procedure for the generation of such materials, along with their spectral and physico-chemical characteristics, is presented here.

Decomposition of Ionic Liquids by Photocatalysis

Morawski A., Janus M., Goc-Maciejewska I., Syguda A., Pernak J.

Polish Journal of Chemistry

2005

Vol. 79 / nr 12

1929-1935

Amethod for the decomposition of ionic liquid (ILs) by photocatalysis has been demonstrated. The participation of ILs in light absorption by TiO2 was shown. The IL molar mass influence on photocatalytic decomposition was proven. The samples with a lower molarmass had higher stability under UVlight in the presence of TiO2. The degree of decomposition depends upon the cation and anion. The easiest to degrade proved to be ILs with a long alkyl substituent. Ammonium ILs (choline derivatives) with hydroxyl group proved to bemore stable than with acetyl group. Themost readily decomposable salts are phosphonium ionic liquids.