Application of spectroscopic evidence to diffuse layer model (DLM) parameter estimation for cation adsorption onto ferrihydrite in single- and bi-solute systems

2021 ◽  
pp. 120199
Author(s):  
Sheik Mohammad Nomaan ◽  
Shannon N. Stokes ◽  
Joonkyoung Han ◽  
Lynn E. Katz
Keyword(s):  
Parameter Estimation ◽  
Diffuse Layer ◽  
Layer Model ◽  
Spectroscopic Evidence ◽  
Cation Adsorption ◽  
Diffuse Layer Model

scholarly journals Is a Stern and diffuse layer model appropriate to ionic liquids at surfaces?

2013 ◽  
Vol 110 (44) ◽  
pp. E4121-E4121 ◽  
Author(s):  
S. Perkin ◽  
M. Salanne ◽  
P. Madden ◽  
R. Lynden-Bell
Keyword(s):  
Ionic Liquids ◽  
Diffuse Layer ◽  
Layer Model ◽  
Diffuse Layer Model

Modeling Cd2 +  sorption onto ferrihydrite in the presence of phthalic acid

2008 ◽  
Vol 58 (12) ◽  
pp. 2373-2379
Author(s):  
Y. Song ◽  
N. Singhal ◽  
P. Swedlund ◽  
S. Swift
Keyword(s):  
Experimental Data ◽  
Phthalic Acid ◽  
Binary Systems ◽  
Organic Ligand ◽  
Low Ph ◽  
Ternary Complexes ◽  
Diffuse Layer ◽  
Layer Model ◽  
Data Prediction ◽  
Diffuse Layer Model

Cadmium sorption by ferrihydrite in the presence of phthalic acid was examined over a range of pH (4.0 ∼ 8.5) conditions and sorbate/sorbent ratios. The presence of phthalic acid enhanced Cd2 +  sorption by forming ternary complexes on ferrihydrite surface, especially at low pH, but for high pH and high total organic ligand/Fe(mmol/mol) ratios, it decreased Cd2 +  sorption onto ferrihydrite by forming soluble complexes with the phthalate in solution. In binary systems, Cd2 +  and phthalic acid sorption by ferrihydrite was well reproduced using the diffuse layer model with sorption constants derived from the experimental data. Prediction using the optimised binary sorption constants for Cd2 +  sorption onto ferrihydrite in the presence of phthalic was poor and achieving a good fit required the inclusion of two additional ternary complexes.

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