Dispersion of H−Magadiite and H−Kenyaite Particles by Ion Exchange of H+with Alkali Ions

Langmuir ◽  
1996 ◽  
Vol 12 (5) ◽  
pp. 1124-1126 ◽  
Author(s):  
Katsunori Kosuge ◽  
Atsumu Tsunashima
Keyword(s):  
Ion Exchange ◽  
Alkali Ions

scholarly journals Fluoride-free synthesis of a Sn-BEA catalyst by dry gel conversion

2015 ◽  
Vol 17 (5) ◽  
pp. 2943-2951 ◽  
Author(s):  
Chun-Chih Chang ◽  
Hong Je Cho ◽  
Zhuopeng Wang ◽  
Xuanting Wang ◽  
Wei Fan
Keyword(s):  
Ion Exchange ◽  
Organic Template ◽  
Free Medium ◽  
Seed Crystals ◽  
Alkali Ions ◽  
Dry Gel Conversion ◽  
Conversion Method ◽  
First Time

A Sn-BEA catalyst was synthesized in a fluoride-free medium for the first time via a dry gel conversion method. The use of alkali ions, zeolite BEA seed crystals and ion-exchange before the removal of the organic template has been shown to be indispensable to obtain the desired material.

Thermodynamics of ion exchange processes involving alkali ions on H+ -form m-cresol formaldehyde in aqueous acetone

1985 ◽  
Vol 87 ◽  
pp. 21-27 ◽  
Author(s):  
E.A. Hassan ◽  
M.F. El-Hadi ◽  
A.S.Abu El-Magd ◽  
F.H. Kamal ◽  
M.S. Metwally
Keyword(s):  
Ion Exchange ◽  
Aqueous Acetone ◽  
Alkali Ions ◽  
Exchange Processes

Study of an Inorganic Ion Exchanger Mg2Ti1.25(PO4)3

2012 ◽  
Vol 442 ◽  
pp. 50-53 ◽  
Author(s):  
Heng Li
Keyword(s):  
Ion Exchange ◽  
Diffraction Method ◽  
Ion Exchanger ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
Alkali Ions ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Result Show ◽  
Saturation Capacity

The ion-exchanger Mg2Ti1.25(PO4)3 of spinel type was prepared by means of the solid state reaction crystallization method. Its ion-exchange properties for alkali ions such as saturation capacity of exchange and distribution coefficient were determined. Mg2Ti1.25(PO4)3 was characterized by virtue of X-ray diffraction method. This inorganic ion-exchanger (Mg2Ti1.25(PO4)3) has the saturation capacity of exchange for Li+ higher than those for other alkali ions, the saturation capacity of exchange for Li+ reaches to 6.0mmol/g, MgTi-750(H) has a higher selectivity of ion exchange for Li+ than for other alkali ions. These result show MgTi-750 (H) has better memory and selectivity of ion exchange, and higher capacity of ion exchange for Li+. It is a kind of prospective ionic sieve for Li+.

Ion-Exchange Kinetics Among Three Kinds of Alkali Ions in Glasses

1993 ◽  
Vol 95-98 ◽  
pp. 1193-1200
Author(s):  
H. Wakabayashi ◽  
H. Yamanaka ◽  
Mikio Iwasa ◽  
R. Terai
Keyword(s):  
Ion Exchange ◽  
Alkali Ions ◽  
Ion Exchange Kinetics ◽  
Exchange Kinetics

Synthesis of Mg0.5Ti0.5PO4 and Its Selectivity to Li+ Exchange

2012 ◽  
Vol 512-515 ◽  
pp. 1001-1004
Author(s):  
Jin He Jiang
Keyword(s):  
Solid State ◽  
Ion Exchange ◽  
Solid State Reaction ◽  
Ion Exchanger ◽  
Spinel Type ◽  
Alkali Ions ◽  
Inorganic Ion Exchanger ◽  
Inorganic Ion ◽  
Crystallization Method ◽  
Saturation Capacity

The ion-exchanger Mg0.5Ti0.5PO4 of spinel type was prepared by means of the solid state reaction crystallization method, and was acid-modified. This inorganic ion-exchanger(Mg0.5Ti0.5PO4) has the saturation capacity of exchange for Li+ higher than those for other alkali ions, the saturation capacity of exchange for Li+ reaches to 5.4mmol/g, MgTi-750(H) has a higher selectivity of ion exchange for Li+ than for other alkali ions.

Synthesis of Al1.75Fe1.25(PO4)3 and its Selectivity to Li+ Exchange

2012 ◽  
Vol 490-495 ◽  
pp. 3703-3706
Author(s):  
Jin He Jiang
Keyword(s):  
Ion Exchange ◽  
Diffraction Method ◽  
Ion Exchanger ◽  
X Ray Diffraction ◽  
Spinel Type ◽  
Alkali Ions ◽  
Inorganic Ion ◽  
Crystallization Method ◽  
Result Show ◽  
Saturation Capacity

The ion-exchanger Al1.75Fe1.25(PO4)3of spinel type was prepared by means of the solid state reaction crystallization method. Its ion-exchange properties for alkali ions such as saturation capacity of exchange and distribution coefficient were determined. Al1.75Fe1.25(PO4)3was characterized by virtue of X-ray diffraction method. This inorganic ion-exchanger (Al1.75Fe1.25(PO4)3) has the saturation capacity of exchange for Li+higher than those for other alkali ions, the saturation capacity of exchange for Li+reaches to 7.1mmol/g, AlFe-720(H) has a higher selectivity of ion exchange for Li+than for other alkali ions. These result show AlFe-720 (H) has better memory and selectivity of ion exchange, and higher capacity of ion exchange for Li+. It is a kind of prospective ionic sieve for Li+.

Embedding Procedure for Water Swollen Samples

1970 ◽  
Vol 28 ◽  
pp. 504-505
Author(s):  
Ann M. Thomas ◽  
Virginia Shemeley
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Ion Exchange ◽  
Structural Changes ◽  
Cross Linking ◽  
Ion Exchange Resins ◽  
Transmission Electron ◽  
First Pass ◽  
Exchange Resins

Those samples which swell rapidly when exposed to water are, at best, difficult to section for transmission electron microscopy. Some materials literally burst out of the embedding block with the first pass by the knife, and even the most rapid cutting cycle produces sections of limited value. Many ion exchange resins swell in water; some undergo irreversible structural changes when dried. We developed our embedding procedure to handle this type of sample, but it should be applicable to many materials that present similar sectioning difficulties.The purpose of our embedding procedure is to build up a cross-linking network throughout the sample, while it is in a water swollen state. Our procedure was suggested to us by the work of Rosenberg, where he mentioned the formation of a tridimensional structure by the polymerization of the GMA biproduct, triglycol dimethacrylate.

Elemental mass loss in silicate minerals during x-ray analysis

1990 ◽  
Vol 48 (4) ◽  
pp. 804-805
Author(s):  
P.E. Champness ◽  
R.W. Devenish
Keyword(s):  
Mass Loss ◽  
Current Density ◽  
Damage Mechanism ◽  
Beam Current ◽  
Single Chain ◽  
Plagioclase Feldspar ◽  
X Ray ◽  
Alkali Ions ◽  
Structural Order ◽  
Sheet Silicate

It has long been recognised that silicates can suffer extensive beam damage in electron-beam instruments. The predominant damage mechanism is radiolysis. For instance, damage in quartz, SiO2, results in loss of structural order without mass loss whereas feldspars (framework silicates containing Ca, Na, K) suffer loss of structural order with accompanying mass loss. In the latter case, the alkali ions, particularly Na, are found to migrate away from the area of the beam. The aim of the present study was to investigate the loss of various elements from the common silicate structures during electron irradiation at 100 kV over a range of current densities of 104 - 109 A m−2. (The current density is defined in terms of 50% of total current in the FWHM probe). The silicates so far ivestigated are:- olivine [(Mg, Fe)SiO4], a structure that has isolated Si-O tetrahedra, garnet [(Mg, Ca, Fe)3Al2Si3AO12 another silicate with isolated tetrahedra, pyroxene [-Ca(Mg, Fe)Si2O6 a single-chain silicate; mica [margarite, -Ca2Al4Si4Al4O2O(OH)4], a sheet silicate, and plagioclase feldspar [-NaCaAl3Si5O16]. Ion- thinned samples of each mineral were examined in a VG Microscopes UHV HB501 field- emission STEM. The beam current used was typically - 0.5 nA and the current density was varied by defocussing the electron probe. Energy-dispersive X-ray spectra were collected every 10 seconds for a total of 200 seconds using a Link Systems windowless detector. The thickness of the samples in the area of analysis was normally 50-150 nm.

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