Intraparticle mass transfer processes of Phenol Blue (PB) in single octadecylsilyl (ODS)-silica gel microparticles in acetonitrile-water were analyzed by microcapillary manipulation and microabsorption methods. An absorption maximum of PB, the sorption isotherm parameters, and the sorption rate in the microparticle system were highly dependent on the percentage of acetonitrile in solution. The ...

This paper presents the feasibility of removal of MB dye from aqueous solution using activated carbon prepared from Usoro fiber (Adenia lobata). FTIR analysis revealed that many functional groups were present on the surface of the adsorbent. The adsorption Kinetics was analyzed by pseudo first order, pseudo second order and intra particle diffusion kinetics models. Results showed that MB adsorp...

ABSTRACT In electrostatic repulsive interaction chromatography, using a charged surface hybrid sorbent carrying positive charges can improve the peak shape of peptides in reversed-phase liquid chromatography (RP-LC), especially in overloaded conditions, compared with standard C18 sorbents. However, the positive surface charges can interact with anionic additives commonly used in peptide separat...

The present paper examines the adsorption of water by microporous carbons containing various amounts of surface oxygen an a smaller proportion of basic centres. The modelling of water adsorption for 293 and 310 K, using variable pore size distribution (PSD), confirms that the overall type IV isotherm is the sum of a type I isotherm associated with the specific interactions, and a typ V isotherm...

We compute the thermal conductivity and diffusion coefficient of supercritical carbon dioxide along the 313 K isotherm using non-equilibrium molecular dynamics. Comparisons are made with experiment at four densities corresponding to pressures of 30, 70, 200 and 500 bar. Two intermolecular potential models for carbon dioxide are compared. INTRODUCTION In a previous paper (Wang and Cummings, 1988...

In the present work, the usefulness of almond peel as a sorbent material has been investigated for the removal of methylene blue from synthetic aqueous solutions in batch conditions. Isotherm of dye sorption was measured. The influence of different experimental parameters such as: almond peel mass, particles size, temperature, initial pH of solution and NaCl concentration on this isotherm was s...

This study investigates the capacity of granular activated carbon (GAC) for the storage of methane through the equilibrium adsorption. An experimental apparatus consist of a dual adsorption vessel was set up for the measurement of equilibrium adsorption of methane on GAC using volumetric technique (pressure decay). Experimental isotherms of methane adsorption were determined by the measurement ...

The effect of temperature on the equilibrium sorption of Pb 2+ from aqueous solution onto a low-cost electric furnace slag was investigated. In this paper, two-parameter isotherm models namely the Langmuir and the Freundlich and three-parameter isotherm model namely Redlich–Peterson were applied to describe the isotherms and to calculate their constants. The best estimation of the parameters of...

The present work investigates the equilibrium adsorption of Chrysene on multi-walled carbon nanotubes at 293, 303 and 313°K, and determines the equilibrium adsorption isotherms and thermodynamic parameters (ΔG, ΔH and ΔS). The values of ΔH and ΔG suggested that the adsorption of Chrysene onto MWCNTs was endothermic and nonspontaneous.The experimental data were analyzed using Langmuir, Freundlic...

We calculated the inherent structure of a model melt of zinc ~II! bromide over a wide range of densities. Stable, metastable, and unstable branches were obtained for the zero temperature pressure–volume isotherm of the inherent structure. The pressure–volume isotherm, the void distribution, and the structure factor were used to identify the spinodal, independent of any model equation of state. ...