This article describes an improvement on a previous model proposed by Ba~ant and Najjar, in which moisture diffusivity and moisture capacity are treated as separate parameters. These parameters are evaluated from independent test results, and are shown to depend on the water:cement ratio, curing time, temperature, and cement type. The moisture capacity is obtained as the slope of the adsorption...

Isotherms of Zn 2+ ions adsorption by native and 3% H 2 SO 4 solution-treated leaves Acacia auriculiformis were plotted. The resulting isotherms processed using the Langmuir, Freundlich, Dubinin-Radushkevich Temkin models. It was found that these with earleaf acacia are most accurately described model modified Langmuir model. modification a solution contributes to an increase in maximum sorptio...

Simulation studies are undertaken for the system Ag/Au(100) by means of grand canonical Monte Carlo applied to a large lattice system. The interactions are calculated using the embedded atom model. The formation of adsorbed Ag phases of low dimensionality on Ag(100) is investigated and the influence of surface defects on the shape of the adsorption isotherms is studied. The results of the simul...

The analysis of surface and pores of activated carbons oxidized to various degrees has been carried out on the basis of adsorption isotherms of nitrogen, water and several organic compounds. The reason for the large hysteresis of isotherms of water was ascribed to the structure formation of water in the micropores caused by the hydrophobic interaction at water-carbon inferface. INTRODUCTION The...

It is shown that experimentally obtained isotherms of adsorption on solid substrates may be completely reconciled with Lifshitz theory when thermal fluctuations of the free film surface are taken into account. This is demonstrated for hydrogen adsorbed on gold as a model system. Analysis of the fluctuation contributions allows one to determine the surface tension of the free hydrogen film as a ...

The present review discusses the state of the art of the thermodynamic treatment for variable charge at solid/liquid interfaces. The most important equations are given for the case of generic surface sites. This can easily be extended to the more general case for multiple surface sites. Detailed aspects involving thermodynamic standard states of simple and multidentate surface complexes are add...

The purpose of this study is to investigate the capacity of natural Turkish zeolite for NH4-N removal from landfill leachate. The effects of modification and initial concentration on the removal of NH4-N from leachate were also investigated. The kinetics of adsorption of NH4-N has been discussed using three kinetic models, i.e., the pseudo-second order model, the Elovich equation, the intrapart...

The adsorption of fluorine ions from aqueous solutions by oxihydroxides of aluminum was studied. The equilibrium sorption was explained by using the Lengmuire, Freundlich, Bet and Redlich-Peterson models of isotherms. The results obtained allow one to conclude that the mathematical model of adsorption Freundlich is the best for describing the measured experimental data, which testifies to the h...