Cd adsorption onto Anoxybacillus flavithermus: Surface complexation modeling and spectroscopic investigations

2006 ◽  
Vol 70 (21) ◽  
pp. 5253-5269 ◽  
Author(s):  
Peta-Gaye G. Burnett ◽  
Christopher J. Daughney ◽  
Derek Peak
Keyword(s):  
Surface Complexation ◽  
Surface Complexation Modeling ◽  
Spectroscopic Investigations ◽  
Anoxybacillus Flavithermus ◽  
Cd Adsorption

scholarly journals Surface complexation modeling of Cd(II) sorption to montmorillonite, bacteria, and their composite

2016 ◽  
Author(s):  
Ning Wang ◽  
Huihui Du ◽  
Qiaoyun Huang ◽  
Peng Cai ◽  
Xingmin Rong ◽  
...  
Keyword(s):  
Surface Complexation ◽  
Bacterial Cells ◽  
Surface Complexation Modeling ◽  
Isothermal Adsorption ◽  
Spectra Analysis ◽  
Potential Measurement ◽  
Gram Positive Bacteria ◽  
Component Systems ◽  
Adsorption Processes ◽  
Cd Adsorption

Abstract. Surface complexation modeling (SCM) has emerged as a powerful tool for simulating heavy metal adsorption processes on the surface of soil solid components under different geochemical conditions. The component additivity (CA) approach is one of the strategies that have been widely used in multi-component systems. In this study, potentiometric titration, isothermal adsorption, zeta potential measurement, and extended X-ray absorption fine structure (EXAFS) spectra analysis were conducted to investigate Cd adsorption on 2 : 1 clay mineral montmorillonite, on Gram-positive bacteria Bacillus subtilis, and their mineral-organic composite. We developed constant capacitance models (CCM) of Cd adsorption on montmorillonite, bacterial cells, and mineral-organic composite. The adsorption behavior of Cd on the surface of the composite was well explained by CA-SCM. Some deviations were observed from the model simulations at pH 

scholarly journals Surface complexation modeling of Cd(II) sorption to montmorillonite, bacteria, and their composite

2016 ◽  
Vol 13 (19) ◽  
pp. 5557-5566 ◽  
Author(s):  
Ning Wang ◽  
Huihui Du ◽  
Qiaoyun Huang ◽  
Peng Cai ◽  
Xingmin Rong ◽  
...  
Keyword(s):  
Heavy Metal ◽  
Surface Complexation ◽  
Bacterial Cells ◽  
Surface Complexation Modeling ◽  
Isothermal Adsorption ◽  
Spectra Analysis ◽  
Composite Surface ◽  
Potential Measurement ◽  
Adsorption Processes ◽  
Cd Adsorption

Abstract. Surface complexation modeling (SCM) has emerged as a powerful tool for simulating heavy metal adsorption processes on the surface of soil solid components under different geochemical conditions. The component additivity (CA) approach is one of the strategies that have been widely used in multicomponent systems. In this study, potentiometric titration, isothermal adsorption, zeta potential measurement, and extended X-ray absorption fine-structure (EXAFS) spectra analysis were conducted to investigate Cd adsorption on 2 : 1 clay mineral montmorillonite, on Gram-positive bacteria Bacillus subtilis, and their mineral–organic composite. We developed constant capacitance models of Cd adsorption on montmorillonite, bacterial cells, and mineral–organic composite. The adsorption behavior of Cd on the surface of the composite was well explained by CA-SCM. Some deviations were observed from the model simulations at pH < 5, where the values predicted by the model were lower than the experimental results. The Cd complexes of X2Cd, SOCd+, R-COOCd+, and R-POCd+ were the predominant species on the composite surface over the pH range of 3 to 8. The distribution ratio of the adsorbed Cd between montmorillonite and bacterial fractions in the composite as predicted by CA-SCM closely coincided with the estimated value of EXAFS at pH 6. The model could be useful for the prediction of heavy metal distribution at the interface of multicomponents and their risk evaluation in soils and associated environments.

Cadmium adsorption capacity of selected Ontario soils

1996 ◽  
Vol 76 (2) ◽  
pp. 183-189 ◽  
Author(s):  
K. A. Bolton ◽  
L. J. Evans
Keyword(s):  
Soil Properties ◽  
Linear Regression Analysis ◽  
Surface Complexation ◽  
Solution Concentration ◽  
Multiple Linear Regression Analysis ◽  
Batch Adsorption ◽  
Surface Complexation Modeling ◽  
Ph Values ◽  
Cadmium Adsorption ◽  
Cd Adsorption

The retention of Cd by selected Ontario soils with a range of soil properties was investigated. Batch adsorption experiments were carried out at the actual (unadjusted) PH of the soil and at a range of PH values adjusted by the addition of acid or base. For all soils, Cd adsorption increased with increasing pH and with increasing Cd solution concentration. The adsorption data was fitted, by a linear least squares technique, to the Langmuir adsorption isotherm. Maximum adsorption, qmax, at unadjusted soil pH values ranged from less than 8 mmol kg−1 for the Fox sandy soil to 64.8 mmol kg−1 for the Hanbury heavy clay soil. Calculated Cd adsorption maxima were regressed against measured soil properties to determine the most important properties involved in the adsorption of Cd. Multiple linear regression analysis revealed the best model to be qmax = 8.33 + 0.67 (organic carbon) + 4.37 (inorganic – poorly crystalline Fe, Fepc). Surface complexation modeling indicates that humic surfaces account for adsorption at pH values beginning at approximately 3.5 and that hydrous ferric oxide surfaces account for Cd adsorption at pH values greater than 7. Key words: Cadmium adsorption, Langmuir isotherm, surface complexation, soil contamination

Surface Complexation Modeling of Proton and Cd Adsorption onto an Algal Cell Wall

2005 ◽  
Vol 39 (11) ◽  
pp. 4060-4065 ◽  
Author(s):  
Emily S. Kaulbach ◽  
Jennifer E. S. Szymanowski ◽  
Jeremy B. Fein
Keyword(s):  
Cell Wall ◽  
Algal Cell ◽  
Surface Complexation ◽  
Surface Complexation Modeling ◽  
Algal Cell Wall ◽  
Cd Adsorption

Surface Complexation Modeling of Eu(III) and U(VI) Interactions with Graphene Oxide

2016 ◽  
Vol 50 (4) ◽  
pp. 1821-1827 ◽  
Author(s):  
Yu Xie ◽  
Edward M. Helvenston ◽  
Lindsay C. Shuller-Nickles ◽  
Brian A. Powell
Keyword(s):  
Graphene Oxide ◽  
Surface Complexation ◽  
Surface Complexation Modeling

Surface complexation modeling of Pb(II) adsorption on mixtures of hydrous ferric oxide, quartz and kaolinite

2010 ◽  
Vol 275 (3-4) ◽  
pp. 262-271 ◽  
Author(s):  
Thomas J. Reich ◽  
Soumya Das ◽  
Carla M. Koretsky ◽  
Tracy J. Lund ◽  
Christopher J. Landry
Keyword(s):  
Ferric Oxide ◽  
Surface Complexation ◽  
Hydrous Ferric Oxide ◽  
Surface Complexation Modeling
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