Applicability of Equilibrium Isotherm Models for the Biosorptive Uptakes in Comparison to Activated Carbon-Based Adsorption

Maurya, Nityanand Singh; Mittal, Atul K.

doi:10.1061/(asce)0733-9372(2006)132:12(1589)

Cited by 31 publications

(18 citation statements)

References 43 publications

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“…1a and 2a the experimental data trend shows this S-shaped trend at lower concentration range. Maurya and Mittal obtained similar results for BET (C S = constant) and Langmuir equations in liquid phase adsorption of dyes on biosorbents (Maurya and Mittal 2006). For example according to their results, q m values calculated by BET and Langmuir equations were 203.78 and 204.38 mg/g, respectively.…”

Section: Bet-casesupporting

confidence: 64%

“…As it will be shown, the calculated monolayer adsorption capacity by both Langmuir and BET isotherms will also be similar. Maurya and Mittal obtained such results (Maurya and Mittal 2006) when applying BET equation for modeling liquid phase adsorption of Methylene Blue and Rhodamin B cationic dyes on biosorbents prepared from mushrooms and on activated carbon, F300. They concluded that BET isotherm predicted adsorption capacity similar to that using Langmuir isotherm and that there was no possibility of multilayer adsorption in their system.…”

Section: Introductionmentioning

confidence: 83%

“…they extended the simple analogy between P and C to the case of P S and C S . They have taken C S as a known constant quantity from solubility data (Parker 1995;Maurya and Mittal 2006;Khalili et al 2000;Fu and Viraraghavan 2000;Hall et al 2001;Ramakrishna and Viraraghavan 1997). In this case, BET equation will have two degrees of freedom and it will behave like Langmuir isotherm equation when applied to the experimental data of liquid phase adsorption.…”

Section: Introductionmentioning

confidence: 99%

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What is the correct form of BET isotherm for modeling liquid phase adsorption?

2009

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In this work subtleties of application of BET isotherm for liquid phase adsorption is presented. It has been shown that direct use of the classical BET equation (which was developed for gas phase adsorption) to liquid phase adsorption leads to ambiguous and erroneous results. Some cases of misuse of BET equation for liquid phase adsorption have been revisited. By close examination of the development of the classical equation, the causes of misunderstandings were elucidated and the suitable form of the BET equation for liquid phase adsorption was developed. As case studies, the classical form of the BET equation along with the correct form of the equation for liquid phase have been applied for modeling liquid phase adsorption of methyl tertbutyl ether (MTBE) on perfluorooctyl alumina, phenol on activated carbon and pentachlorophenol on carbonized bark. It has been shown that direct application of the classical BET isotherm to liquid phase adsorption results in poor and erroneous estimation of the equation parameters. For example, in aqueous phase adsorption of MTBE on perfluorooctyl alumina, the monolayer adsorption capacity of the adsorbent was calculated as 9.7 mg/g instead of 3.3 mg/g or the saturation concentration of MTBE in water was calculated as 1212 mg/L instead of 42000 mg/L.

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Section: Bet-casesupporting

confidence: 64%

Section: Introductionmentioning

confidence: 83%

Section: Introductionmentioning

confidence: 99%

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What is the correct form of BET isotherm for modeling liquid phase adsorption?

2009

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“…To develop the fundamental understanding of protein adsorption, two typical adsorption models with the same degree of freedom (Andrade & Vanwagenen 1983), Langmuir and Freundlich isotherms (Docoslis et al 1999), were used. The applicability of models having the same degree of freedom is known to provide theoretical insight rather than a mere comparison of model fitting (Maurya & Mittal 2006). The construction of the Langmuir isotherm provided two important pieces of information: the value of the maximum attainable concentration of bound protein in a monolayer formation and the equilibrium constant for the adsorption.…”

Section: Bsa Adsorption Isotherms: Langmuir and Freundlich Modelsmentioning

confidence: 99%

The competitive adsorption of human proteins onto natural-based biomaterials

Alves

Reis

Hunt

2010

J. R. Soc. Interface.

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This study aims to further the understanding of nanoscale structures relevant for cellular recognition on contact and interaction with natural-based materials. The correlation between surface characteristics and protein adsorption from unitary and complex protein systems was investigated with respect to altering the bulk chemistry of the substrate material. Polymeric blends of starch and cellulose acetate, polycaprolactone (SPCL) and ethylene vinyl alcohol (SEVA-C) were used. Different proteins, bovine serum albumin, human serum albumin (HSA) and human fibronectin (HFN), were selected for this study. The construction of adsorption isotherms is an important starting point towards characterizing the interactions between surfaces and proteins. In this study, albumin adsorption isotherms fit the Freundlich model and were correlated with the chemistry and morphology of surfaces. In addition, protein distribution, quantification and competition were measured using fluorimetry and visualized by confocal microscopy. The analysis of unitary systems demonstrated that the adsorption of HSA was generally lower than that of HFN. In the latter case, SPCL and SEVA-C blends reached adsorption values of 97 and 89 per cent, respectively. In studying the co-adsorption of proteins, an increase in both HSA and HFN on SEVA-C surfaces was observed. SPCL showed no substantial increase in the adsorption of the proteins in competitive conditions. The similarity of these materials with other polysaccharide-based materials increases the relevance of the presented results. This study provides valuable information for the development of strategies towards the control of protein orientation and functionality as the availability of cell signalling epitopes for a broader family of materials that continue to be a significant component of this field of research.

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“…Although numerous isotherm models were reported in literature, due to their simplicity, the Langmuir model and the Freundlich model are more frequently used (Maurya 2006). Langmuir and Freundlich isotherms are used for explaining the equilibrium phenomena of the important toxic metals such as nickel, chromium and copper (Uslu 2006;Cossich 2002).…”

Section: Equilibrium Modelingmentioning

confidence: 99%

Biosorption of nickel with barley straw

Thevannan

Mungroo

Niu

2010

Bioresource Technology

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Nickel contaminated wastewater from plating industries is a major environmental concern. Current treatment methods are often expensive and can also create additional problems. Biosorption is an alternative treatment method that uses inexpensive biomaterials to sequester metals from aqueous solutions. In this study, acid washed barley straw (AWBS) was used for adsorbing nickel ions (Ni 2+ ) from simulated nickel plating wastewater. The adsorption process was rapid and the equilibrium was reached in about anhour. An increase in the initial nickel concentration increased the equilibrium nickel uptake, and the maximum uptake was found to be 8.45 mg/g of AWBS when the initial nickel concentration was1000 mg/L at pH 5. Nickel adsorption was favorable at room temperature than 5 o C and 40 o C, better adsorption rate and equilibrium uptake was observed at 23 o C. Increasing the pH from 3 to 7 increased the equilibrium nickel uptake and the maximum uptake was observed at pH 7, whilst the initial nickel ion concentration was 100 mg/L. The Freundlich isotherm model exhibited better fit with the equilibrium data than the Langmuir equation. Nickel was desorbed using hydrochloric acid solution at pH 2 and the desorption efficiency was 86%. LIST OF TABLES

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Applicability of Equilibrium Isotherm Models for the Biosorptive Uptakes in Comparison to Activated Carbon-Based Adsorption

Cited by 31 publications

References 43 publications

What is the correct form of BET isotherm for modeling liquid phase adsorption?

What is the correct form of BET isotherm for modeling liquid phase adsorption?

The competitive adsorption of human proteins onto natural-based biomaterials

Biosorption of nickel with barley straw

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