Application of the Polanyi adsorption potential theory to adsorption from solution on activated carbon

Manes, Milton; Hofer, L. J. E.

doi:10.1021/j100723a018

Cited by 125 publications

(93 citation statements)

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“…5. Five nonlinear sorption isotherm models (Table 2) of Freundlich (FM) (Freundlich, 1906), Langmuir (LM) (Langmuir, 1916), Dual Mode (DMM) (Xing and Pignatello, 1997), Dual Langmuir (DLM) (Sander and Pignatello, 2005) and Polanyi-Manes models (PMM) (Manes, 1980) were tested to fit the sorption of TCP on six MWCNTs. The PMM model fits all of the sorption isotherms well with the lowest MWSE (Fig.…”

Section: Adsorption Of Tcpmentioning

confidence: 99%

“…The PMM theory was developed to describe physical adsorption to microporous adsorbents and involved a pore filling mechanism and the concept of a variable adsorption potential in response to pore filling (Manes, 1980). This theory would appear to be applicable in this case since MWCNTs form bundles in aqueous media and the spaces between the tubes within the bundles can be regarded as pores, as other researchers have (Yang et al, 2006a;Pan et al, 2008).…”

Section: Adsorption Of Tcpmentioning

confidence: 99%

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Adsorption of 2,4,6-trichlorophenol by multi-walled carbon nanotubes as affected by Cu(II)

et al. 2009

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Cu(II)Multi IntroductionCarbon nanotubes (CNTs) are considered to be superior adsorbents of pollutants due to their unique properties and relative high reactivity. (Li et al., 2003a;Lu and Chiu, 2006;Wang et al., 2005). Oxidation removes impurities and hemispherical caps, hence increases surface area and introduces oxygen-containing functional groups (Li et al., 2003a;Lu and Chiu, 2006;Wang et al., 2005). Modification of the structure and surface properties of CNTs affected sorption capacity and sorption mechanisms of metals and organic chemicals (Li et al., 2003a;Lu and Chiu, 2006;Wang et al., 2005;Lu et al., 2005;Chin et al., 2007;Cho et al., 2008). The adsorption capacity of Cu 2þ at a given pH followed the order NaOClmodified CNTs > HNO 3 -modified CNTs > as-produced CNTs (Wu, 2007). The extraordinary increase in sorption capacity and decrease in desorption rate of w a t e r r e s e a r c h 4 3 ( 2 0 0 9 ) 2 4 0 9 -2 4 1 8

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Section: Adsorption Of Tcpmentioning

confidence: 99%

Section: Adsorption Of Tcpmentioning

confidence: 99%

Adsorption of 2,4,6-trichlorophenol by multi-walled carbon nanotubes as affected by Cu(II)

et al. 2009

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“…Therefore, another method should be considered to predict the adsorption of dipeptides under other conditions. The Polanyi adsorption potential theory, which was originally proposed for gas phase adsorption, has been expanded to liquid phase adsorption (Manes & Hofer, 1969;Abe et al, 1979). The volume of adsorbate qm,cal [moVkg] o E (3) and (4) with those experimentally observed at pH 7.…”

Section: Discussionmentioning

confidence: 99%

Adsorption of Dipeptides on Activated Carbon.

Adachi

Yamanaka

Matsuno

1998

FSTI

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The adsorption isotherms of some dipeptides composed of un-ionizable side chains were measured at 25'C in a single component system, and all of them obeyed the Langnnuir equation. The parameters obtained at pH 7 could be roughly correlated with the hydrophobic and steric parameters of constituent amino acids. To find a method for predicting the amount of dipeptide adsorbed under various conditions, the applicability of the Polanyi adsorption potential theory was examined. The amount of dipeptide adsorbed could be roughly estimated from the adsorption isotherms of the amino acids, although the estimation lacked strictness in a physical sense.Keywords: adsorption, dipeptide, activated carbon Attention has been paid to the utilization of protein hydrolysate as a food seasoning (Ueno et at, 1990) and foaming agent (Nagatomo et al, 1990). In these applications, a separation process is incorporated to obtain a peptide mixture with a specific functionality. An infusion solution rich in branched amino acids and poor in aromatic ones is useful as a nutrient for patients with liver diseases (Fischer et al, 1976). A peptide mixture with such an amino acid composition would be more promising than an amino acid mixture because of its faster absorption in the intestine and lower osmotic pressure. We reported the preparation of a peptide mixture with a high Fischer ratio, which is the ratio of branched amino acids to aromatic ones, from the enzymatic hydrolysate of casein using gel chromatographic resin (Adachi et al, 1991) or activated carbon (Adachi et al, 1993). The preparation of a peptide mixture rich in aromatic amino acids from a protein hydrolysate was also attempted (Li et al, 1985). Thus, peptides with a definite composition would be useful as foodstuffs.To reasonably design an adsorptive separation of peptides, knowledge of their adsorption equilibria and rate processes is required. A protein hydrolysate includes many kinds of peptides. It would be difficult to predict the adsorption isotherm of each peptide onto an adsorbent in a multi-component system. As the first step in the adsorptive separation design of peptides from protein hydrolysate, we measured the adsorption isotherms of some dipeptides composed of amino acids having un-ionizable side chains onto an activated carbon in a single component system, and the methods to predict them are discussed. Materials and MethodsMaterials Glycyl-L-isoleucine (Gly-Ile), glycyl-L-leucine (Gly-Leu), glycyl-L-phenylalanine (Gly-Phe), glycyl-L-tryptophan (Gly-Trp), glycyl-L-tyrosine (Gly-Tyr), L-leucyl-L-leucine (Leu-Leu), L-leucyl-L-tyrosine (Leu-Tyr) and L-phenylalanyl-L-leucine (Phe-Leu) were purchased from Sigma(Ser-Leu) were obtained from Kokusan Chemical Works, Osaka. Glycylglycine (Gly-Gly) and most ofthe amino acids used were purchased from Wako Pure Chemical Industries, Osaka. L-Tryptophan and L-tyrosine were products of the Peptide Institute, Osaka. Other chemicals were purchased from Nacalai Tesque or Wako Pure Chemical Industries and were of analytical grade.Th...

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“…In this work, the Hill model is used as a local isotherm. The mean adsorption energy E  included in the parameter P 1/2 will be changed to a variable energy E. This equation that we have established using a statistical physics treatment contains implicitly the approximation of Cerofolini [26] (or the theory of Polanyi [27] ) which relate the adsorption energy to the pressure.…”

Section: Integral Equationmentioning

confidence: 99%

On the use of the Hill’s model as local isotherm in the interpretation of the behaviour of the adsorption energy distributions

Torkia¹,

Khalfaoui²,

Lamine³

2014

IOSRJAP

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Application of the Polanyi adsorption potential theory to adsorption from solution on activated carbon

Cited by 125 publications

References 0 publications

Adsorption of 2,4,6-trichlorophenol by multi-walled carbon nanotubes as affected by Cu(II)

Adsorption of 2,4,6-trichlorophenol by multi-walled carbon nanotubes as affected by Cu(II)

Adsorption of Dipeptides on Activated Carbon.

On the use of the Hill’s model as local isotherm in the interpretation of the behaviour of the adsorption energy distributions

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