Equilibrium, Kinetics, and Thermodynamics of Bovine Serum Albumin Adsorption on Single-Walled Carbon Nanotubes

Kopac T. | Bozgeyik K.

Article | 2016 | Chemical Engineering Communications203 ( 9 ) , pp.1198 - 1206

We investigated the equilibrium, kinetics, and thermodynamics of bovine serum albumin (BSA) adsorption on single-walled carbon nanotubes (SWNTs) from aqueous solutions with different pH and temperatures. We analyzed the experimental adsorption equilibrium and kinetic data to evaluate the adsorption characteristics of SWNTs for BSA. The results show that the effects of pH and temperature were important. Moreover, the adsorption isotherm data of BSA on SWNTs are consistent with the Langmuir and Freundlich models, while the kinetics can be expressed by the pseudo-first-order and the intraparticle diffusion rate models. The maximum prot . . .ein adsorption capacity of SWNTs, which have a surface area of 191.2 m2/g, was found to be 609.8 mg g-1 at pH 4 and 40°C, and this was the highest value obtained among our previous studies examined with various metal oxides. In addition, the zeta potential measurements were examined to understand the effects of charge density of the surface and the protein on the adsorption process. Thermodynamic analysis results indicate that the nature of adsorption changes with pH. SWNTs were found to be effective for BSA adsorption. © 2016, Copyright © Taylor & Francis Group, LLC Daha fazlası Daha az

Analysis of the electrofiltration mechanism based on multiphase filtration theory

Genç, Ayten | Tosun, İsmail

Article | 2004 | Chemical Engineering Communications191 ( 1 ) , pp.125 - 136

A mathematical model based on multiphase filtration theory is developed to describe the electrofiltration process. The model takes both electrophoretic and electroosmotic effects into account. The electrophoretic migration velocity of solid particles is predicted from the model using the filtrate volume time data obtained from electrofiltration experiments.

Dynamic adsorption of SO2 on zeolite molecular sieves

Kopaç T. | Kaymakçi E. | Kopaç M.

Article | 1998 | Chemical Engineering Communications164 , pp.99 - 109

Sulfur dioxide is one of the major pollutants resulting from fuel combustion. Numerous dry, semi-dry and wet processes have been developed for pollution control of sulfur dioxide. Solid carbonates, natural and synthetic zeolites, ion exchange resins and carbon based sorbents are the most commonly used dry sorbents for sulfur dioxide removal. In this study, measurements of the adsorption properties of sulfur dioxide on zeolites were investigated. The adsorbents used in this work are 5A, 4A and AW300 type molecular sieve zeolites. Adsorption equilibrium parameters were determined from the pulse Chromatographic response to injections o . . .f low concentrations of sulfur dioxide. The method of moments were used to evaluate the adsorption equilibrium parameters from pulse Chromatographic experiments. Data, such as adsorption equilibrium constants or reaction rate parameters are essential in the design of adsorption systems or reactors in which sulfur dioxide is removed. The experiments were conducted in a temperature range of 523-718 K. The relatively strong adsorption properties of sulfur dioxide on zeolites necessitated the use of high carrier gas flow rates and subsequently non-isobaric operation. Non-isobaric pulse Chromatography theory was found to describe accurately the adsorption trends. Adsorption equilibrium constants of SO2 were found to decrease considerably with increasing temperature. It was also found out that adsorption of SO2 on the adsorbents investigated were found to decrease in the order of AW300 > 4A > 5A. The adsorption equilibrium parameter of SO2 on 5A was found as 11.78 at 673 K, whereas it has a value of 157.11 at 523 K. The adsorption equilibrium parameter of SO2 on 4A zeolite was determined to be 8.63 at 718 K and 213.78 at 523 K Daha fazlası Daha az

Sulfur dioxide adsorption isotherms and breakthrough analysis on molecular sieve 5A zeolite

Kopaç, Türkan | Kocabaş, Sefa

Article | 2003 | Chemical Engineering Communications190 ( 05.Aug ) , pp.1041 - 1054

In this study sulfur dioxide adsorption and rate were investigated on molecular sieve 5A zeolite in a packed bed system at 473 K. The experimental adsorption isotherms were compared with Langmuir, Freundlich, and Dubinin-Radushkevitch-Kaganer (DRK) adsorption isotherm models. The simple Langmuir and the Freundlich models provided a better description of sulfur dioxide sorption on molecular sieve 5A zeolite, so that a selective surface adsorption mechanism for adsorption of sulfur dioxide on molecular sieve 5A zeolite can he suggested. The breakthrough behavior for sulfur dioxide adsorption on molecular sieve 5A was also investigated . . . in this study. The experimental breakthrough curves were compared with deactivation models proposed by Orbey et al., and the recent models of Suyadal et al. and Yaşyerli et al. The deactivation models were found to give good agreement with the experimental results Daha fazlası Daha az

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