scholarly journals Adsorption of Chromium (VI) on Calcium Phosphate: Mechanisms and Stability Constants of Surface Complexes

2017 ◽  
Vol 7 (3) ◽  
pp. 222 ◽  
Author(s):  
Ahmed Elyahyaoui ◽  
Kawtar Ellouzi ◽  
Hamzeh Al Zabadi ◽  
Brahim Razzouki ◽  
Saidati Bouhlassa ◽  
...  
Keyword(s):  
Calcium Phosphate ◽  
Stability Constants ◽  
Surface Complexes ◽  
Chromium Vi

scholarly journals Surface Complexation of Chromium(VI) on Iron(III) Hydroxide: Mechanisms and Stability Constants of Surfaces Complexes

2021 ◽  
Vol 21 (3) ◽  
pp. 679
Author(s):  
Mhamed Hmamou ◽  
Fatima Ezzahra Maarouf ◽  
Bouchaib Ammary ◽  
Abdelkebir Bellaouchou
Keyword(s):  
Chemical Nature ◽  
Chemical Interaction ◽  
Surface Complexation ◽  
Sorption Process ◽  
Solution Ph ◽  
Surface Complexes ◽  
Specific Chemical ◽  
Chromium Vi ◽  
Liquid Phases ◽  
Ph Range

The adsorption of chromate ions H2-yA (y = 1, 2, and A = CrO42–) on iron(III) hydroxide was conducted as a function of adsorbent mass, solution pH, and hydration time. The surface complexation technique, based on the examination of the chromate distribution between the solid and liquid phases, was adopted to predict the adsorption mechanism. To specify stoichiometry of the chromate surface complexes, the proton (n > 0), and hydroxyl (n < 0) ion-exchange was evaluated at a pH range of 2–12. The obtained “n” values are ranging between -1 and 1. As a result, the sorption process involved specific chemical interaction with surface sites, resulting in 1H+ and 1OH– release of the adsorbate molecule. The surface species identified were ; ; ; ; ; ; ;  and . The logarithmic values of their complexing constants were: log K00 = 1.81 ± 0.04; log K11 = -3.53 ± 0.07; log K21 = -1.03 ± 0.23, log K1-1 = 7.15 ± 0.14 and log K2-1 = 9.62 ± 0.53. The results showed that the chromate adsorption on Fe(III) hydroxide was of electrostatic and chemical nature at pH lower than 5.5, and only of chemical nature at pH superior to 5.5. Taking into account these considerations, Fe(III) hydroxide could be considered an excellent sorbent for the removal of Cr(VI) from wastewater solutions.

scholarly journals Determination of the stability constants of Zn2+-MnO2 surface complexes.

1988 ◽  
Vol 37 (8) ◽  
pp. 395-399 ◽  
Author(s):  
Hiroki TAMURA ◽  
Noriaki KATAYAMA ◽  
Ryusaburo FURUICHI
Keyword(s):  
Stability Constants ◽  
Surface Complexes ◽  
The Stability

Proton and metal adsorption onto bacterial consortia: Stability constants for metal–bacterial surface complexes

2007 ◽  
Vol 239 (1-2) ◽  
pp. 13-26 ◽  
Author(s):  
Kelly J. Johnson ◽  
Jennifer E.S. Szymanowski ◽  
David Borrok ◽  
Terri Q. Huynh ◽  
Jeremy B. Fein
Keyword(s):  
Stability Constants ◽  
Metal Adsorption ◽  
Surface Complexes ◽  
Bacterial Surface ◽  
Bacterial Consortia

scholarly journals ADSORPTION OF CITRIC ACID ON IRON (III) HYDROXIDE: MECHANISMS AND STABILITY CONSTANTS OF SURFACE COMPLEXES

2021 ◽  
Vol 14 (02) ◽  
pp. 1255-1264
Author(s):  
M. Hmamou ◽  
F. Maarouf ◽  
B. Ammary ◽  
A. Bellaouchou
Keyword(s):  
Citric Acid ◽  
Stability Constants ◽  
Surface Complexes

Immunogold and immunoblot studies on a cell surface protein found in primary mesenchyme cells and in the cortical secretory vesicles of the sea urchin egg

1987 ◽  
Vol 45 ◽  
pp. 832-833
Author(s):  
G.L. Decker ◽  
M.C. Valdizan
Keyword(s):  
Cell Surface ◽  
Sea Urchin ◽  
Surface Protein ◽  
Egg Cell ◽  
Secretory Vesicles ◽  
Cell Surface Protein ◽  
Surface Complexes ◽  
Mesenchyme Cells ◽  
Lowicryl K4m ◽  
Primary Mesenchyme Cells

A monoclonal antibody designated MAb 1223 has been used to show that primary mesenchyme cells of the sea urchin embryo express a 130-kDa cell surface protein that may be directly involved in Ca2+ uptake required for growth of skeletal spicules. Other studies from this laboratory have shown that the 1223 antigen, although in relatively low abundance, is also expressed on the cell surfaces of unfertilized eggs and on the majority of blastomeres formed prior to differentiation of the primary mesenchyme cells.We have studied the distribution of 1223 antigen in S. purpuratus eggs and embryos and in isolated egg cell surface complexes that contain the cortical secretory vesicles. Specimens were fixed in 1.0% paraformaldehyde and 1.0% glutaraldehyde and embedded in Lowicryl K4M as previously reported. Colloidal gold (8nm diameter) was prepared by the method of Mulpfordt.

Determination of stability constants for complexes from catalytic linear scan voltammetric currents

1998 ◽  
Vol 95 (5) ◽  
pp. 1091-1100 ◽  
Author(s):  
J. L. Muñiz Alvarez ◽  
J. A. García Calzón ◽  
J. M. López Fonseca
Keyword(s):  
Stability Constants
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