Activation Parameters for Kinetics of Protein Adsorption at Silica-Water Interface

Sarkar, Deepa; Chattoraj, D. K.

doi:10.1006/jcis.1993.1179

Cited by 74 publications

(35 citation statements)

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“…It is noted from Table 2 that ∆H* is lower than T∆S*, which means that the adsorption process is mostly entropycontrolled for each system. 7 As expected, the entropy of activation, ∆S*, for all systems are smaller than zero. As can be seen from Table 2, the values of ∆G* are close to each other in the studied solvent systems.…”

Section: Adsorption Kineticssupporting

confidence: 74%

Kinetics and isotherms of dazomet adsorption on natural adsorbents

Şişmanoğlu

Erçağ

Pura

et al. 2004

J. Braz. Chem. Soc.

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A adsorção do 3,5-dimetiltetrahidro-1,3,5-tiodiazina-2-tiona (dazomet) sobre betonita e clinopetilolita foi estudada em quarto temperaturas (288, 293, 298 e 303 K) e em duas soluções distintas (água e mistura água-etanol 50%, v/v). A velocidade de adsorção em baixas concentrações de dazomet foi determinada como sendo de primeira ordem. Para cada sistema em concentração fixa, a constante de velocidade aumenta com o aumento da temperatura na solução aquosa, mas diminui no caso da mistura água-álcool a 50%. Usando-se a equação de Arrhenius, as energias de ativação de cada sistema foram calculadas. Parâmetros termodinâmicos foram avaliados de acordo com a equação de Eyring. Os valores de entalpia de ativação, ∆H*, são menores que T∆S*. Os resultados indicam que o processo de adsorção é controlado entropicamente em cada sistema. As isotermas de adsorção foram determinadas a 288 e 303 K. Estas isotermas seguem a equação de Freundlich para soluções aquosas a 15 °C. Para as duas soluções a 30 °C as isotermas foram modeladas de acordo com isotermas de Langmuir e BET.The adsorption of 3,5-dimethyltetrahydro-1,3,5-thiadiazine-2-thione (dazomet) on bentonite and clinoptilolite has been studied at four temperatures (288, 293, 298 and 303 K) and two different solutions (water and water-ethyl alcohol mixture, 50% v/v). The adsorption rates at low concentrations of dazomet were found to fit the first-order kinetic equation. For each system at constant concentration, the rate constants increased with increasing temperature in aqueous solution, but these constants decreased with increasing temperature for 50% (v/v) water-ethyl alcohol mixture solution. By using the Arrhenius equation, the activation energies for each system were calculated. Thermodynamic parameters were evaluated according to Eyring's equation. The values of enthalpy of activation, ∆H*, are lower than T∆S*. The results indicated that the adsorption process was entropy-controlled for each system. Adsorption isotherms were determined at 288 and 303 K. These isotherms were fitted to Freundlich equation for aqueous solution at 15 °C, but adsorption from the two different solutions at 30 °C were modeled according to the Langmuir and BET isotherms.

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Section: Adsorption Kineticssupporting

confidence: 74%

Kinetics and isotherms of dazomet adsorption on natural adsorbents

Şişmanoğlu

Erçağ

Pura

et al. 2004

J. Braz. Chem. Soc.

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“…We have significantly dependent on the nature of the desorbing agent already reported (26) that both at pH 7.0 and at isoelectric pH 11.0, nearly 1 mg/m 2 of this protein may be adsorbed by as expected. 2 , as expected, which means that surface is coated with denatured polypeptide chains forming a spread film (29, 30). The evidence for existence of proteins as a spread film has been given by electrophoretic studies by Chattoraj and Bull (31).…”

Section: Measurement Of Desorption Kineticsmentioning

confidence: 60%

“…2 To whom all correspondence should be addressed. gelatin used in the present study were obtained from Sigma It was found from the protein analysis of the washed solution that no desorption occurred on washing with distilled water.…”

Section: Methodsmentioning

confidence: 99%

Kinetics of Desorption of Proteins from the Surface of Protein-Coated Alumina by Various Desorbing Reagents

Sarkar

Chattoraj

1996

Journal of Colloid and Interface Science

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“…However, it is typically expressed in a range of reaction only 5,28 . The data of Bhargava and Sheldarkar 21 for the sorption of phosphate onto unrinsed tamarind nut shell activated carbon (TNSAC) and rinsed tamarind nut shell activated carbon were plotted according to equation (2) and the results are shown in Figure 1.…”

Section: Analysis Of Data From the Literaturementioning

confidence: 99%

A Comparison of Chemisorption Kinetic Models Applied to Pollutant Removal on Various Sorbents

McKay

1998

Process Safety and Environmental Protection

2,034

898

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A comparison of kinetic models describing the sorption of pollutants has been reviewed. The rate models evaluated include the Elovich equation, the pseudo-® rst order equation and the pseudo-second order equation. Results show that chemisorption processes could be rate limiting in the sorption step. The pseudo-second order equation may be applied for chemisorption processes with a high degree of correlation in several literature cases where a pseudo-® rst order rate mechanism has been arbitrarily assumed.

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Activation Parameters for Kinetics of Protein Adsorption at Silica-Water Interface

Cited by 74 publications

References 0 publications

Kinetics and isotherms of dazomet adsorption on natural adsorbents

Kinetics and isotherms of dazomet adsorption on natural adsorbents

Kinetics of Desorption of Proteins from the Surface of Protein-Coated Alumina by Various Desorbing Reagents

A Comparison of Chemisorption Kinetic Models Applied to Pollutant Removal on Various Sorbents

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