Surface Complexation Models of Adsorption: A Critical Survey in the Context of Experimental Data

Adsorption ◽  
2002 ◽  
pp. 639-718
Keyword(s):  
Experimental Data ◽  
Surface Complexation ◽  
Critical Survey

scholarly journals A Surface Complexation Model of Alkaline-SmartWater Electrokinetic Interactions in Carbonates

2020 ◽  
Vol 146 ◽  
pp. 02003
Author(s):  
Moataz Abu-Al-Saud ◽  
Amani Al-Ghamdi ◽  
Subhash Ayirala ◽  
Mohammed Al-Otaibi
Keyword(s):  
Experimental Data ◽  
Zeta Potential ◽  
Crude Oil ◽  
Oil Recovery ◽  
Surface Complexation ◽  
Surface Complexation Model ◽  
Zeta Potentials ◽  
Smart Water ◽  
Injection Water ◽  
Carbonate Formations

Understanding the effect of injection water chemistry is becoming crucial, as it has been recently shown to have a major impact on oil recovery processes in carbonate formations. Various studies have concluded that surface charge alteration is the primary mechanism behind the observed change of wettability towards water-wet due to SmartWater injection in carbonates. Therefore, understanding the surface charges at brine/calcite and brine/crude oil interfaces becomes essential to optimize the injection water compositions for enhanced oil recovery (EOR) in carbonate formations. In this work, the physicochemical interactions of different brine recipes with and without alkali in carbonates are evaluated using Surface Complexation Model (SCM). First, the zeta-potential of brine/calcite and brine/crude oil interfaces are determined for Smart Water, NaCl, and Na2SO4 brines at fixed salinity. The high salinity seawater is also included to provide the baseline for comparison. Then, two types of Alkali (NaOH and Na2CO3) are added at 0.1 wt% concentration to the different brine recipes to verify their effects on the computed zeta-potential values in the SCM framework. The SCM results are compared with experimental data of zeta-potentials obtained with calcite in brine and crude oil in brine suspensions using the same brines and the two alkali concentrations. The SCM results follow the same trends observed in experimental data to reasonably match the zeta-potential values at the calcite/brine interface. Generally, the addition of alkaline drives the zeta-potentials towards more negative values. This trend towards negative zeta-potential is confirmed for the Smart Water recipe with the impact being more pronounced for Na2CO3 due to the presence of divalent anion carbonate (CO3)-2. Some discrepancy in the zeta-potential magnitude between the SCM results and experiments is observed at the brine/crude oil interface with the addition of alkali. This discrepancy can be attributed to neglecting the reaction of carboxylic acid groups in the crude oil with strong alkali as NaOH and Na2CO3. The novelty of this work is that it clearly validates the SCM results with experimental zeta-potential data to determine the physicochemical interaction of alkaline chemicals with SmartWater in carbonates. These modeling results provide new insights on defining optimal SmartWater compositions to synergize with alkaline chemicals to further improve oil recovery in carbonate reservoirs.

Sorption of Cs, Ni, Pb, Eu(III), Am(III), Cm, Ac(III), Tc(IV), Th, Zr, and U(IV) on MX 80 bentonite: An experimental approach to assess model uncertainty

2006 ◽  
Vol 94 (9-11) ◽  
Author(s):  
Bernd Grambow ◽  
Massoud Fattahi ◽  
Gilles Montavon ◽  
C. Moisan ◽  
E. Giffaut
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Model Uncertainty ◽  
Mineral Assemblage ◽  
Experimental Approach ◽  
Surface Complexation ◽  
Fission Products ◽  
Exchange Model ◽  
Dissolution Properties

A multi-site surface complexation/ion exchange model for dispersed MX 80 bentonite has been calibrated, considering the dissolution properties of the constituting mineral assemblage, for sorption of a large number of radionuclides, using experimental data from the present study together with well constrained literature data. Emphasis was on tri- and tetravalents actinides and fission products and reducing groundwater compositions.

Sorption of Tetracycline Antibiotics from Water

2013 ◽  
Vol 316-317 ◽  
pp. 641-644
Author(s):  
Hua Xiao ◽  
Man Yu ◽  
Wen Hao An ◽  
Yu Xin Xu ◽  
Xiao Yang Chen ◽  
...  
Keyword(s):  
Experimental Data ◽  
Veterinary Medicine ◽  
Adsorption Mechanism ◽  
Surface Complexation ◽  
Water Environment ◽  
Model Fit ◽  
Exchange Cation ◽  
Tetracycline Antibiotics ◽  
Adsorption Mechanisms ◽  
Pseudo Second Order

Antibiotics are used in large amounts as human and veterinary medicine. Due to their use pattern, they possess a potential for reaching the water environment. In recent years great amount of evidence showed that tetracycline antibiotics were frequently detected in aquatic environment. In this paper, the literature on adsorption of tetracyclines (TCs) were reviewed and summarized. Adsorption kinetics, adsorption isotherm, and adsorption mechanism were discussed. The pseudo-second-order kinetics model fit the experimental data best in most cases of adsorption of TCs. Sorption of TCs followed Freundlich or Langmuir isotherm well in all cases. At last, main adsorption mechanisms such as cation exchange, cation bridging at surfaces, surface complexation, and hydrogen bonding could be suggested based on analysis by XRD, FTIR, NMR, HPLC, LC-MS, etc.

Sorption of Molybdenum(VI) on Synthetic Magnetite

2006 ◽  
Vol 932 ◽  
Author(s):  
Miquel Rovira ◽  
Joan de Pablo ◽  
I. Ignasi Casas ◽  
Javier Giménez ◽  
Frederic Clarens ◽  
...  
Keyword(s):  
Experimental Data ◽  
Surface Complexation ◽  
Layer Model ◽  
Liquid Ratio ◽  
Surface Complexation Model ◽  
Synthetic Magnetite ◽  
Diffuse Layer Model ◽  
Monodentate Complex ◽  
Solid Liquid ◽  
Influence Of Ph

ABSTRACTIn this study we experimentally investigated the interaction of Mo(VI) with magnetite, which is a corrosion product of steel. The work was conducted with commercial magnetite, and we studied the influence of pH, pe and solid/liquid ratio on Mo sorption. A Surface Complexation Model (SCM) has been applied tothe experimental data, allowing to explain the results using the Diffuse Layer Model (DLM) and by considering the formation of the monodentate complex: >FeOMo(OH)5. At pH 2, experimental data were satisfactorily fitted to a a Langmuir isotherm.

scholarly journals Surface Complexation Modeling of Biomolecule Adsorptions onto Titania

2019 ◽  
Vol 3 (1) ◽  
pp. 28 ◽  
Author(s):  
Nataliya N. Vlasova ◽  
Olga V. Markitan
Keyword(s):  
Experimental Data ◽  
Nucleic Acid ◽  
Surface Complexation ◽  
Surface Complexation Modeling ◽  
Surface Complexation Model ◽  
Wide Range ◽  
Reaction Constants

The adsorption of nucleic acid components on the surface of nanocrystalline titaniumdioxide (anatase, pH<sub>pzc</sub> = 6.5) in NaCl solutions was investigated using potentiometric titrationsand multibatch adsorption experiments over a wide range of pH and ionic strengths. The BasicStern surface complexation model was applied to experimental data to obtain quantitativeequilibrium reaction constants. Adsorption results suggest that there is a considerable difference inthe binding of nucleobases, nucleosides, and nucleotides with an anatase surface.

scholarly journals Study of Pu(IV) and Am(III) sorption to clay minerals: laboratory experiments and modeling

2011 ◽  
Vol 1 (1) ◽  
pp. 237-244
Author(s):  
G. Lujanienė ◽  
P. Beneš ◽  
K. Štamberg ◽  
D. Vopalka ◽  
E. Radžiūtė
Keyword(s):  
Experimental Data ◽  
Ion Exchange ◽  
Clay Minerals ◽  
Iron Oxides ◽  
Laboratory Experiments ◽  
Background Electrolyte ◽  
Surface Complexation ◽  
Sorption Behavior ◽  
Natural Clay ◽  
Sorption Mechanisms

Abstract Sorption of Pu(IV) and Am(III) to natural clay from a mixture of synthetic rainwater — cement water was studied by batch and sequential extraction experiments as a function of pH and ionic strength These experiments were intended to simulate the effect of cement dissolution, causing the release of K+, Ca2+ and other cations from solidified radioactive waste into the aqueous phass. The results indicated a complex sorption behavior of the elements studied. It was found that iron oxides play an important role in the uptake of Pu(IV), whereas ion exchange and CaCO3 are mainly responsible for the binding of Am(III) on the clay. Simplified sorption experiments were conducted with clay minerals and iron oxides, using 0.01 and 0.1 mol/L NaNO3 as background electrolyte under an Ar atmosphere, for a better understanding of the sorption mechanisms. The experimental data were interpreted using the combination of surface complexation and ion-exchange models.

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