A facile synthetic route and dual function of network luminescent porous polyester and copolyester containing porphyrin moiety for metal ions sensor and dyes adsorption

2020 ◽  
Vol 298 ◽  
pp. 110063 ◽  
Author(s):  
Kamal I. Aly ◽  
Marwa M. Sayed ◽  
Mohamed Gamal Mohamed ◽  
Shiao Wei Kuo ◽  
Osama Younis
Keyword(s):  
Metal Ions ◽  
Dual Function ◽  
Synthetic Route ◽  
Dyes Adsorption ◽  
Porphyrin Moiety

A dual-function colorimetric chemosensor for thiols and transition metal ions based on ICT mechanism

2008 ◽  
Vol 49 (52) ◽  
pp. 7391-7394 ◽  
Author(s):  
Yan Zeng ◽  
Guanxin Zhang ◽  
Deqing Zhang ◽  
Daoben Zhu
Keyword(s):  
Transition Metal ◽  
Metal Ions ◽  
Transition Metal Ions ◽  
Dual Function ◽  
Colorimetric Chemosensor

scholarly journals A Ca2+ MOF combining highly efficient sorption and capability for voltammetric determination of heavy metal ions in aqueous media

2019 ◽  
Vol 7 (25) ◽  
pp. 15432-15443 ◽  
Author(s):  
Anastasia D. Pournara ◽  
Antigoni Margariti ◽  
Georgios D. Tarlas ◽  
Andreas Kourtelaris ◽  
Valeri Petkov ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Electrochemical Sensor ◽  
Heavy Metal Ions ◽  
Aqueous Media ◽  
Voltammetric Determination ◽  
Dual Function ◽  
Two Dimensional ◽  
First Time

The two-dimensional Ca-MOF shows a dual function as a sorbent and an electrochemical sensor for heavy metal ions, which is reported for the first time for a MOF material.

scholarly journals USE OF THE WALNUT SHELL (JUGLANS REGIA) AS A SORPTION MATERIAL TO REMOVE POLLUTANTS FROM NATURAL AND WASTE WATER

2020 ◽  
pp. 5-18
Author(s):  
Il'dar Gil'manovich Shaykhiyev ◽  
Svetlana Vasil'yevna Sverguzova ◽  
Karina Il'darovna Shaykhiyeva ◽  
Zhanna Anuarovna Sapronova
Keyword(s):  
Metal Ions ◽  
Juglans Regia ◽  
Aqueous Media ◽  
Sorption Isotherms ◽  
Walnut Shell ◽  
Order Model ◽  
Sorption Material ◽  
Pseudo Second Order ◽  
Dyes Adsorption ◽  
Sorption Characteristics

The literature data on the crushed walnut shells usageas a sorption material for metal ions, dyes and some organic compounds removal from aqueous media are summarized. Trees of the Juglans regia species are widespread in Russia; their shells are natural annually replenished material that is of industrial importance and can be used as sorption material for the extraction of many pollutants from aquatic environments. The paper gives a characteristic of the walnut shell, shows the indicators of the main substances that make up the shell (cellulose, lignin, hemicellululose), indicates the approximate specific surface area for BET and the content of functional groups. The results of studies of the adsorption of metal ions and and some dyes adsorption by walnut shellsare considered. The values of sorption indices for the studied pollutants are given. It is shown that it is possible to increase the sorption characteristics by chemical modification of the Juglans regia shell. It is determined that sorption isotherms in most cases are more fully described by the Langmuir model, and the process kinetics in all cases obeys the pseudo-second order model.

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.

Sign in / Sign up

Export Citation Format

Share Document