+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

On the Applicability of the Langmuir Equation to Estimation of Adsorption Equilibrium Constants on a Powdered Solid from Aqueous Solution

, : On the Applicability of the Langmuir Equation to Estimation of Adsorption Equilibrium Constants on a Powdered Solid from Aqueous Solution. Journal of Colloid and Interface Science 231(1): 8-12

The Langmuir adsorption equation has become popular for summarizing solution-solid adsorption data and estimating adsorption equilibrium constants. The applicability of the Langmuir equation to estimation of adsorption equilibrium constants at solid-aqueous solution interfaces was theoretically examined in terms of (1) comparisons of solid-solution adsorption with solid-gas adsorption, (2) deductions of the Langmuir mathematical expression for the nonelectrolyte/solvent exchange, the phase exchange, the ion exchange, and the simple association reactions, and (3) the fitting procedure. The restrictive assumptions underlying the Langmuir equation for solid-gas adsorption may not be valid for adsorption of solute of small molecules or ions by a powdered solid surface from the aqueous solution phase. The fit of adsorption data to the Langmuir mathematical expression cannot be ascertained solely by the linearity of the commonly used equilibrium concentration/amount adsorbed versus the equilibrium concentration plot and does not provide the actual mechanism of the loss of small molecules or ions from aqueous solution. Therefore, the parameters of fitting to the Langmuir mathematical expression may not provide an unambiguous chemical meaning. In addition, we attempt to bring attention to the importance of the standard states of surface phase and solution phase. Copyright 2000 Academic Press.


PMID: 11082242

DOI: 10.1006/jcis.2000.7057

Other references

Novitski, E.; Hanks, G.D., 1959: Use of chromosomes showing meio-tic drive in study of population structure. Any deviation from the equality in the number of A and A' progeny ordinarily produced by an AA' heterozygote will have the immediate effect of altering the allele frequencies in a population. When such a deviation has its origin in an an...

Pritchard, C., 1996: New patterns of suicide by age and gender in the United Kingdom and the Western World 1974-1992; an indicator of social change?. Between 1974 and 1992 male suicide increased in the United Kingdom and in most countries of the Western World. At the same time there were substantial reductions in female suicide in many countries. However, these results mask significant changes...

Santoro, A.Beatriz.; Struchiner, C.José.; Suarez-Kurtz, G., 2016: L-thyroxine doses required for TSH suppression in patients with differentiated thyroid cancer: Effect of a novel UGT1 marker, rs11563250A > G. British Journal of Clinical Pharmacology 82(5): 1402-1403

Kobza, J., 1989: Distribution of iron and aluminium in the profile of Albo-gleyic Luvisols and Dystric Planosols from the genetic viewpoint. Soil physical data and iron and aluminium distributions in four soil profiles (2 Albo-gleyic Luvisols, a Dystric Planosol and a Chromo-gleyic Luvisol) from the Lucenec basin, Czechoslovakia, are presented. Dithionite and oxalate iron levels indica...

Outlaw, W.H.J. ; Lowry, O.H., 1977: Organic acid and potassium accumulation in guard cells during stomatal opening. Leaflets of Vicia faba L. with either open or closed stomata were quick-frozen and freeze-dried. Individual guard cell pairs and pure samples of palisade parenchyma, spongy parenchyma and epidermis lacking guard cells were dissected from the leafl...

Young, V.R.; Yu, Y.M.; Krempf, M., 1990: Protein and amino acid turnover using the stable isotopes 15N, 13C, and superscript 2H as probes. The use of stable isotope-labelled compounds, particularly those enriched with superscript 2H, 13C and 15N, for non-invasive study of amino acid kinetics and protein or nitrogen turnover in vivo is reviewed. 15N end-product and plasma (precursor,...

Rykovskaia, I., 1962: Effect of aminazin on the metabolism of lipids. Zdravookhranenie Kazakhstana 22(7): 56-59

Revyakin, A.; Naryshkin, N.; Kim, Y.; Mekler, V.; Ebright, R.H., 2001: Structural organization of transcription initiation complexes. Biophysical Journal 80(1 Part 2): 478a, January

Soinila, S.; Haanpää, M., 2012: Botulinum toxins for pain. We review the evidence of botulinum toxins in the treatment of pain. Main indications of botulinum toxin treatment, dystonia and spasticity, involve pain. Increasing evidence suggests direct analgesic effects of botulinum. Botulinum inhibits relea...

Hayes, C., 1999: The specialist nurse role in Parkinson's disease. The growing elderly population will result in a higher incidence of Parkinson's disease. People with Parkinson's disease experience adverse effects from both the condition and the drugs used to treat it. Nurse specialists can play a key...