Kinetics of interaction of metal ions with two tetraazatetraacetate macrocycles

1982 ◽  
Vol 21 (9) ◽  
pp. 3349-3352 ◽  
Author(s):  
Stanislaw P. Kasprzyk ◽  
Ralph G. Wilkins
Keyword(s):  
Metal Ions ◽  
Kinetics Of

Study on Adsorption of Crosslinked Starch Microspheres towards Heavy Metal Ions

2013 ◽  
Vol 834-836 ◽  
pp. 531-535
Author(s):  
Li Yan Yang ◽  
Yi Hui Guo ◽  
Li Li Yu ◽  
Jing You
Keyword(s):  
Metal Ions ◽  
Reversed Phase ◽  
Adsorption Rate ◽  
X Ray Diffraction ◽  
Adsorption Selectivity ◽  
X Ray ◽  
Starch Microsphere ◽  
Other Substances ◽  
Effects Of Media ◽  
Kinetics Of

A type of cross-linking starch microsphere (CSMs) has been synthesized via reversed phase suspension method. Crosslinked starch microsphere has good adsorption performance to metal ions in water. The adsorption kinetics of Co (II) on the CSMs, selectivity of adsorption CSMs towards Co (II),Cu (II),Pb (II),Cd (II) and adsorption effects of media towards Co (II) were investigated. The CSMs and its adsorption product were comparatively characterized by X-ray diffraction (XRD). The results showed that The adsorption rate is mainly controlled by liquid film diffusion, and the constant of adsorption rate is 0.0686min-1 at 308K. The crystal structure of the CSMs decreased greatly after the incorporation of Co (II). Co (II) has better adsorption selectivity on CSMs. Ions coexist and other substances in the solution have certain impact on adsorption. Those data are helpful for treatment of the wastewater containing heavy ions.

KINETICS OF THIN OXIDE FILM GROWTH ON METAL CRYSTALS

2000 ◽  
Vol 07 (01n02) ◽  
pp. 135-139 ◽  
Author(s):  
V. P. ZHDANOV ◽  
P. R. NORTON
Keyword(s):  
Oxide Film ◽  
Metal Oxide ◽  
Metal Ions ◽  
Film Growth ◽  
Phase Interface ◽  
Oxide Interface ◽  
Thin Oxide Film ◽  
Thin Oxide Films ◽  
Thin Oxide ◽  
Kinetics Of

A seminal model describing the kinetics of growth of thin oxide films on metal crystals was proposed by Cabrera and Mott (CM). The model is based on the assumption that the growth is limited by the field-facilitated activated jumps of metal ions located in steps on the metal–oxide interface. We generalize the CM model by (i) exploring the interplay of jumps of metal ions from the step and terrace sites at the metal–oxide interface, and (ii) scrutinizing the processes at the oxide–gas-phase interface. The former factor is found to change the physical meaning of the parameters in the CM growth law. The latter factor results in modification of the growth law. In particular, the oxidation kinetics becomes dependent on the O2 pressure. More specifically, the oxidation rate is predicted to increase with increasing pressure. This effect is, however, rather weak and becomes progressively weaker with increasing oxide film thickness.

Kinetics of removal of zinc ions from aqueous solutions by a modified acrylnitrile copolymer

1999 ◽  
Vol 39 (8) ◽  
pp. 139-146
Author(s):  
R. Y. Stefanova
Keyword(s):  
Aqueous Solutions ◽  
Metal Ions ◽  
Sorption Process ◽  
Intraparticle Diffusion ◽  
Zinc Ions ◽  
Sorption System ◽  
Modified Polymer ◽  
Rate Limiting Step ◽  
High Sorption ◽  
Kinetics Of

The kinetics of removal of zinc ions from aqueous solutions by a modified acrylnitrile copolymer containing carboxyl and amino groups has been investigated. The dependence of the rate of removal on the intensity of stirring, the size of the sorbent's particles, the initial concentration of metal ions and the temperature of the solution have been established. Attempts have been made to identify the rate limiting step and to determine the batch kinetic parameters. The limiting conditions of the transition from external to intraparticle diffusion step of mass transfer in a sorption system have been determined. The coefficients of intraparticle diffusion and the energy of activation of the sorption process have been established. The data obtained in this work show that the modified polymer with a high sorption capacity and very good kinetic characteristics can be successfully used for removal of heavy metal ions from water solutions and industrial wastewaters.

Intercalation kinetics of alkali-metal ions into .gamma.-zirconium phosphate using the pressure-jump technique

1986 ◽  
Vol 90 (12) ◽  
pp. 2757-2761 ◽  
Author(s):  
Naoki Mikami ◽  
Minoru Sasaki ◽  
Naofumi Kawamura ◽  
Kim F. Hayes ◽  
Tatsuya Yasunaga
Keyword(s):  
Alkali Metal ◽  
Metal Ions ◽  
Zirconium Phosphate ◽  
Alkali Metal Ions ◽  
Pressure Jump ◽  
Kinetics Of

Synthesis of isostructural porous metal-benzenedicarboxylates: Effect of metal ions on the kinetics of synthesis

CrystEngComm ◽  
2010 ◽  
Vol 12 (10) ◽  
pp. 2749 ◽  
Author(s):  
Enamul Haque ◽  
Jong Hwa Jeong ◽  
Sung Hwa Jhung
Keyword(s):  
Metal Ions ◽  
Porous Metal ◽  
Kinetics Of
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