scholarly journals Study on Adsorbents for Metal Ions Using Porous Silicate and Cellulose Fiber

2020 ◽  
Vol 31 (1) ◽  
pp. 1-8
Author(s):  
Syunichi OSHIMA
Keyword(s):  
Metal Ions ◽  
Cellulose Fiber ◽  
Porous Silicate

Development of tannin-immobilized cellulose fiber extracted from coconut husk and the application as a biosorbent to remove heavy metal ions

2020 ◽  
Vol 14 ◽  
pp. 100389
Author(s):  
Kotchaporn Taksitta ◽  
Prapasiri Sujarit ◽  
Nuanlaor Ratanawimarnwong ◽  
Suchao Donpudsa ◽  
Kriangsak Songsrirote
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Cellulose Fiber ◽  
Coconut Husk

scholarly journals Behavior of transport and separation of lanthanum, yttrium and lutetium metal ions through celluose fiber supported solid membrane

2012 ◽  
Vol 31 (2) ◽  
pp. 255 ◽  
Author(s):  
Abaji G Gaikwad
Keyword(s):  
Nitric Acid ◽  
Citric Acid ◽  
Hydrochloric Acid ◽  
Metal Ions ◽  
Cellulose Fiber ◽  
Esterification Reaction ◽  
Aliquat 336 ◽  
Dilute Solution ◽  
Fiber Membrane ◽  
Source Phase

A novel idea explored was to study the behavior of transport and separation of lanthanum, yttrium and lutetium metal ions by using cellulose fiber supported solid membrane. The cellulose fiber membrane was prepared by chemical modification of cellulose fiber by esterification reaction with citric acid. Different experimental variables such as time variation, membrane length, stirrings of source and receiving phase, pH of source phase, different stripping agents  such as nitric acid, hydrochloric acid, sodium nitrate, ammonium thoicyanate, D2EHPA, TBP, Aliquat-336, tartaric acid, EDTA, organic solvents, etc in receiving phase were explored. Pre-concentration of lanthanum, yttrium and lutetium metal ions from dilute solution was carried out.

scholarly journals Adsorption Behavior of Metal Ions on Cellulose Fiber Modified with Schiff Base Compound Having Pyridyl Groups

2018 ◽  
Vol 29 (3) ◽  
pp. 83-89
Author(s):  
Yuri OKADA ◽  
Harumi YAMADA ◽  
Kaoru FUJINAGA ◽  
Yu KOMATSU ◽  
Mune-aki SAKAMOTO ◽  
...  
Keyword(s):  
Schiff Base ◽  
Metal Ions ◽  
Cellulose Fiber ◽  
Adsorption Behavior ◽  
Schiff Base Compound ◽  
Base Compound

HREM Study of electron-induced surface radiation damage in ReO3

1991 ◽  
Vol 49 ◽  
pp. 636-637
Author(s):  
R. Ai ◽  
H.-J. Fan ◽  
L. D. Marks
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Metal Oxides ◽  
Electron Irradiation ◽  
Transition Metal Oxides ◽  
Carbon Film ◽  
Transition Metal Ions ◽  
Surface Radiation ◽  
Valence Transition ◽  
Electron Microscopes

It has been known for a long time that electron irradiation induces damage in maximal valence transition metal oxides such as TiO2, V2O5, and WO3, of which transition metal ions have an empty d-shell. This type of damage is excited by electronic transition and can be explained by the Knoteck-Feibelman mechanism (K-F mechanism). Although the K-F mechanism predicts that no damage should occur in transition metal oxides of which the transition metal ions have a partially filled d-shell, namely submaximal valence transition metal oxides, our recent study on ReO3 shows that submaximal valence transition metal oxides undergo damage during electron irradiation.ReO3 has a nearly cubic structure and contains a single unit in its cell: a = 3.73 Å, and α = 89°34'. TEM specimens were prepared by depositing dry powders onto a holey carbon film supported on a copper grid. Specimens were examined in Hitachi H-9000 and UHV H-9000 electron microscopes both operated at 300 keV accelerating voltage. The electron beam flux was maintained at about 10 A/cm2 during the observation.

ELNES of Iron Compounds

1990 ◽  
Vol 48 (2) ◽  
pp. 28-29
Author(s):  
Hiroki Kurata ◽  
Kazuhiro Nagai ◽  
Seiji Isoda ◽  
Takashi Kobayashi
Keyword(s):  
Energy Loss ◽  
Metal Ions ◽  
Energy Resolution ◽  
Transition Metal Oxides ◽  
Local Symmetry ◽  
Iron Compounds ◽  
Fine Structures ◽  
Electron Energy Loss ◽  
Fe Ions ◽  
Electron Energy Loss Spectra

Electron energy loss spectra of transition metal oxides, which show various fine structures in inner shell edges, have been extensively studied. These structures and their positions are related to the oxidation state of metal ions. In this sence an influence of anions coordinated with the metal ions is very interesting. In the present work, we have investigated the energy loss near-edge structures (ELNES) of some iron compounds, i.e. oxides, chlorides, fluorides and potassium cyanides. In these compounds, Fe ions (Fe2+ or Fe3+) are octahedrally surrounded by six ligand anions and this means that the local symmetry around each iron is almost isotropic.EELS spectra were obtained using a JEM-2000FX with a Gatan Model-666 PEELS. The energy resolution was about leV which was mainly due to the energy spread of LaB6 -filament. The threshole energies of each edges were measured using a voltage scan module which was calibrated by setting the Ni L3 peak in NiO to an energy value of 853 eV.

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