Benzenecarboxylate Surface Complexation at the Goethite (α-FeOOH)/Water Interface:  I. A Mechanistic Description of Pyromellitate Surface Complexes from the Combined Evidence of Infrared Spectroscopy, Potentiometry, Adsorption Data, and Surface Complexation Modeling

Langmuir ◽  
2000 ◽  
Vol 16 (13) ◽  
pp. 5719-5729 ◽  
Author(s):  
Jean-François Boily ◽  
Nils Nilsson ◽  
Per Persson ◽  
Staffan Sjöberg
Keyword(s):  
Infrared Spectroscopy ◽  
Surface Complexation ◽  
Water Interface ◽  
Surface Complexation Modeling ◽  
Surface Complexes ◽  
Adsorption Data

Surface complexation modeling of Cr(VI) adsorption at the goethite–water interface

2015 ◽  
Vol 455 ◽  
pp. 55-62 ◽  
Author(s):  
Jinyu Xie ◽  
Xueyuan Gu ◽  
Fei Tong ◽  
Yanping Zhao ◽  
Yinyue Tan
Keyword(s):  
Surface Complexation ◽  
Water Interface ◽  
Surface Complexation Modeling

Ion Exchange Thermodynamics at the Rutile–Water Interface: Flow Microcalorimetric Measurements and Surface Complexation Modeling of Na–K–Rb–Cl–NO3 Adsorption

Langmuir ◽  
2017 ◽  
Vol 33 (20) ◽  
pp. 4934-4941 ◽  
Author(s):  
Tyler Hawkins ◽  
Nicholas Allen ◽  
Michael L. Machesky ◽  
David J. Wesolowski ◽  
Nadine Kabengi
Keyword(s):  
Ion Exchange ◽  
Surface Complexation ◽  
Water Interface ◽  
Surface Complexation Modeling

scholarly journals Competitive Adsorption of As(III), As(V), and PO4 by an Iron Oxide Impregnated Activated Carbon: Surface Complex Modeling

2020 ◽  
Vol 231 (9) ◽  
Author(s):  
T. Angele Ngantcha-Kwimi ◽  
Brian E. Reed
Keyword(s):  
Iron Oxide ◽  
Competitive Adsorption ◽  
Surface Complexation ◽  
Carbon Surface ◽  
Hydrous Ferric Oxide ◽  
Layer Model ◽  
Surface Complexation Modeling ◽  
Adsorption Data ◽  
Double Layer Model ◽  
Binuclear Species

Abstract The objective of this study was to predict the competitive adsorption of As(III), As(V), and PO4 by an iron oxide impregnated carbon (L-Act, 9% Fe(III) amorphous iron oxide) over a range of environmental conditions using the surface complexation modeling (SCM) approach. L-Act surface complexation constants determined from a single pH-adsorption edge were used to predict pH-dependent competitive removal in singular, binary, and tertiary adsorbate systems. As(III), As(V), and PO4 complexes were modeled as bidentate binuclear species at low pH and monodentate species at high pH using the two monoprotic surface site/diffuse electric double layer model (2MDLM). F values determined based on 2MDLM predictions were close to those calculated by FITEQL (a statistical optimization program) demonstrating the effectiveness of the 2MDLM in describing adsorption behavior. F values were generally in the recommended range of 0.1–20 indicating a good fit between the data and the model. The 2MDLM also successfully predicted As(III)/As(V)/PO4 adsorption data of hydrous ferric oxide and goethite adsorbents from the literature.

scholarly journals Antimony (V) Adsorption at the Hematite–Water Interface: A Macroscopic and In Situ ATR-FTIR Study

Soil Systems ◽  
2021 ◽  
Vol 5 (1) ◽  
pp. 20
Author(s):  
Jerzy Mierzwa ◽  
Rose Mumbi ◽  
Avedananda Ray ◽  
Sudipta Rakshit ◽  
Michael E. Essington ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Adsorption Mechanism ◽  
Surface Complexation ◽  
Outer Sphere ◽  
Surface Complexation Modeling ◽  
Surface Complexes ◽  
Ph Values ◽  
Oxide Minerals ◽  
Complexation Mechanism

The environmental mobility of antimony (Sb) is largely unexplored in geochemical environments. Iron oxide minerals are considered major sinks for Sb. Among the different oxidation states of Sb, (+) V is found more commonly in a wide redox range. Despite many adsorption studies of Sb (V) with various iron oxide minerals, detailed research on the adsorption mechanism of Sb (V) on hematite using macroscopic, spectroscopic, and surface complexation modeling is rare. Thus, the main objective of our study is to evaluate the surface complexation mechanism of Sb (V) on hematite under a range of solution properties using macroscopic, in situ attenuated total reflectance Fourier transform infrared (ATR-FTIR) spectroscopic, and surface complexation modeling. The results indicate that the Sb (V) adsorption on hematite was highest at pH 4–6. After pH 6, the adsorption decreased sharply and became negligible above pH 9. The effect of ionic strength was negligible from pH 4 to 6. The spectroscopic results confirmed the presence of inner- and outer-sphere surface complexes at lower pH values, and only outer-sphere-type surface complex at pH 8. Surface complexation models successfully predicted the Sb (V) adsorption envelope. Our research will improve the understanding of Sb (V) mobility in iron-oxide-rich environments.

Adsorption of Glyphosate on Goethite (α-FeOOH): Surface Complexation Modeling Combining Spectroscopic and Adsorption Data

2008 ◽  
Vol 42 (7) ◽  
pp. 2464-2469 ◽  
Author(s):  
Caroline M. Jonsson ◽  
Per Persson ◽  
Staffan Sjöberg ◽  
John S. Loring
Keyword(s):  
Surface Complexation ◽  
Surface Complexation Modeling ◽  
Adsorption Data
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