scholarly journals Study of the surface properties of glauconite

2021 ◽  
Vol 12 (2-2021) ◽  
pp. 142-147
Author(s):  
E. V. Kuznetsova ◽  
Keyword(s):  
Surface Complexation ◽  
Exchange Capacity ◽  
Charged Surface ◽  
Acidic Ph ◽  
Acid Base ◽  
Surface Complexation Model ◽  
Acid Base Equilibrium ◽  
Cadmium And Lead ◽  
Positively Charged ◽  
Constant Exchange

The acid-base properties of the glauconite surface has been studied by potentiometric titration. Using a surface complexation model with a constant exchange capacity, it was shown that positively charged surface centers and exchange centers dominate in the acidic pH region, and negatively charged centers dominate in the neutral and alkaline regions. The corresponding constants of acid-base equilibrium have been calculated. The data obtained were used to study the sorption of cadmium and lead on glauconite.

Variable charges of a red soil from different depths: Acid-base buffer capacity and surface complexation model

2018 ◽  
Vol 159 ◽  
pp. 107-115 ◽  
Author(s):  
Ying Wang ◽  
Pengfei Cheng ◽  
Fangbai Li ◽  
Tongxu Liu ◽  
Kuan Cheng ◽  
...  
Keyword(s):  
Buffer Capacity ◽  
Surface Complexation ◽  
Red Soil ◽  
Acid Base ◽  
Surface Complexation Model ◽  
Different Depths

A surface complexation model for cadmium and lead adsorption onto diatom surface

2006 ◽  
Vol 88 (1-3) ◽  
pp. 110-113 ◽  
Author(s):  
A. Gélabert ◽  
O.S. Pokrovsky ◽  
C. Reguant ◽  
J. Schott ◽  
A. Boudou
Keyword(s):  
Surface Complexation ◽  
Lead Adsorption ◽  
Surface Complexation Model ◽  
Cadmium And Lead

Approaches to modelling uranium(VI) adsorption on natural mineral assemblages

2000 ◽  
Vol 88 (9-11) ◽  
Author(s):  
T.D. Waite ◽  
James A. Davis ◽  
B.R. Fenton ◽  
Timothy E. Payne
Keyword(s):  
Performance Assessment ◽  
Goodness Of Fit ◽  
Surface Complexation ◽  
Acid Base ◽  
Surface Complexes ◽  
Natural Mineral ◽  
Surface Complexation Model ◽  
Surface Sites ◽  
Stepwise Manner ◽  
Mineral Assemblages

Component additivity (CA) and generalised composite (GC) approaches to deriving a suitable surface complexation model for description of U(VI) adsorption to natural mineral assemblages are pursued in this paper with good success. A single, ferrihydrite-like component is found to reasonably describe uranyl uptake to a number of kaolinitic iron-rich natural substrates at pH > 4 in the CA approach with previously published information on nature of surface complexes, acid-base properties of surface sites and electrostatic effects used in the model. The GC approach, in which little pre-knowledge about generic surface sites is assumed, gives even better fits and would appear to be a method of particular strength for application in areas such as performance assessment provided the model is developed in a careful, stepwise manner with simplicity and goodness of fit as the major criteria for acceptance.

Modeling of Nickel Sorption and Speciation in a Natural Sediment-Groundwater System

1988 ◽  
Vol 127 ◽  
Author(s):  
Volker Koss
Keyword(s):  
Cation Exchange ◽  
Cation Exchange Capacity ◽  
Surface Complexation ◽  
Exchange Capacity ◽  
Natural Sediment ◽  
Sorption Data ◽  
Surface Complexation Model ◽  
Natural Systems ◽  
Groundwater Systems ◽  
Simple Surface

ABSTRACTThe sorption of nickel in 15 natural sediment-groundwater systems from Gor leben has been modeled using a simple surface complexation model. An apparent constant of nickel sorption has been computed taking into account the bulk cation exchange capacity of the sediment, the analytical composition of the groundwater and experimental sorption data obtained from related systems. The method of determining the prevailing surface complex has been described in detail, using changing properties of the natural systems. Competition from natural groundwater components for sorption sites has been taken into account.The main parameters governing nickel sorption are cation exchange capacity of the sediment, together with ionic strength and pH of the groundwater. The model describes the influence of citrate on sorption and allows one to compare the varying sorption data of similar systems.Computations were performed using the geochemical code MINEQL.

scholarly journals The Acid-Base Buffer Capacity of Red Soil Variable Charge Minerals and Its Surface Complexation Model

2017 ◽  
Vol 75 (6) ◽  
pp. 637 ◽  
Author(s):  
Pengfei Cheng ◽  
Ying Wang ◽  
Kuan Cheng ◽  
Fangbai Li ◽  
Haoli Qin ◽  
...  
Keyword(s):  
Buffer Capacity ◽  
Surface Complexation ◽  
Red Soil ◽  
Acid Base ◽  
Surface Complexation Model ◽  
Variable Charge

Spectrophotometric study of the interaction of Chromazurol S and Eriochromazurol B with surface active substances - tensides

1981 ◽  
Vol 46 (5) ◽  
pp. 1090-1106 ◽  
Author(s):  
Irena Burešová ◽  
Vlastimil Kubáň ◽  
Lumír Sommer
Keyword(s):  
Critical Micellar Concentration ◽  
Spectrophotometric Study ◽  
Conditional Stability ◽  
Acid Base ◽  
Binary Complexes ◽  
Chromazurol S ◽  
Acid Base Equilibrium ◽  
Poorly Soluble ◽  
Conditional Stability Constants ◽  
Triton X

The acid-base and optical properties of Chromazurol S and Eriochromazurol B in the presence of 1 . 10-6 - 2 . 10-2M solutions of cetylpyridinium bromide, cetyltrimethylammonium bromide and 1-ethoxycarbonylpentadecyltrimethylammonium bromide (Septonex) and 0.001-1.0% w/v solutions of octylphenolpolyethylene glycol ether (Triton X-100), polyoxyethylenemonolauryl ether (Brij 35) and lauryl sulphate sodium salt were determined by graphical and numerical interpretation of absorbance curves. The poorly soluble ion associates, which can be extracted into chloroform and which have the defined composition [LH4-nn-.n T+] or [LH3-nn-.n T+] are formed at submicellar concentration of the tenside. In regions close to the critical micellar concentration of the tenside, soluble binary complexes of the acid-base forms of the reagent are formed with tenside micelles. The conditional stability constants of the reagent acid-base equilibrium depend on the type and concentration of the tenside, on the reagent concentration, on the concentration and type of inorganic acid anions and on the ionic strength of the solution. The mechanism of interaction of the reagent with the tenside and the probable structure of the binary species are discussed.

Sorption of Cadmium and Lead by Chelating Ion Exchangers Ostsorb OXIN, Ostsorb DETA, and Ostsorb DTTA

1994 ◽  
Vol 59 (6) ◽  
pp. 1311-1318 ◽  
Author(s):  
Ladislav Svoboda ◽  
Petr Vořechovský
Keyword(s):  
Ionic Strength ◽  
Aqueous Solutions ◽  
Sodium Perchlorate ◽  
Exchange Capacity ◽  
Chloride Ions ◽  
Point Of View ◽  
Alkaline Media ◽  
Ion Exchangers ◽  
Acidic Media ◽  
Cadmium And Lead

The properties of cellulose chelating ion exchangers Ostsorb have been studied in the sorption of cadmium and lead from aqueous solutions. The Cd(II) and Pb(II) ions are trapped by the Ostsorb OXIN and Ostsorb DETA ion exchangers most effectively in neutral and alkaline media but at these conditions formation of stable hydrolytic products of both metals competes with the exchange equilibria. From this point of view, Ostsorb DTTA appears to be a more suitable sorbent since it traps the Pb(II) and Cd(II) ions in acidic media already. Chloride ions interfere with the sorption of the two metals by Ostsorb DTTA whereas the ionic strength adjusted by the addition of sodium perchlorate does not affect the exchange capacity of this ion exchanger.

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