it seems using the maxwell-stefan (m-s) diffusion model in combination with the vacancy solutiontheory (vst) and the single-component adsorption data provides a superior, qualitative, andquantitative prediction of diffusion in zeolites. in the m-s formulation, thermodynamic factor (г) isan essential parameter which must be estimated by an adsorption isotherm. researchers usually utilizethe simp...

in this research, adsorption of dibenzothiophene (dbt) as a model of sulfur containing material has been studied by pb exchanged y-zeolite under different experimental conditions. the adsorption was kinetically fast and high adsorption capacity was obtained. the equilibrium adsorption data were analyzed using langmuir and freunlich isotherm models. the corresponding parameters and correlation c...

In this study, the Langmuir adsorption isotherm has been coupled with activity coefficient models for prediction of surface tension of single and mixed electrolyte solutions. Various activity models such as Meissner, Pitzer and extended UNIQUAC have been used and coupled with Langmuir adsorption isotherm. The model parameters were determined through mathematical optimization using experimental ...

A new biosorbent was developed by coating chitosan, a naturally and abundantly available biopolymer, on to polyvinyl chloride (PVC) beads. The biosorbent was characterized by FTIR spectra, porosity and surface area analyses. Equilibrium and column flow adsorption characteristics of copper(II) and nickel(II) ions on the biosorbent were studied. The effect of pH, agitation time, concentration of ...

in this study, nano-tio2 was employed for the adsorption of chloroform from aqueous solution in batch equilibrium experiments to investigate its adsorption properties. the effects of ph, initial chloroform concentration and nano-tio2 dosage were also investigated. optimal conditions for chloroform removal by nano-tio2 have been then identified. results of equilibrium experiments showed that the...

The removal of heavy metal ions from wastewater by ion exchange resins ( zeolite and purolite C105), was investigated. adsorption process, which is pH dependent, shows maximum at 6 7 for C105 initial concentrations 50-250 mg/l, with resin dose 0.25-3 g. capacity found to be 9.74, 9.23 9.71 mg/g Cu2+, Pb2+, Ni2+ on respectively, while the 9.64 ,8.73 9.39 respectively. 97-98% Cu2+ 92- 93% Pb2+ ze...

In this study, the adsorption of mercury ions by Sargassum bevanom (S. bevanom) by batch method was investigated. The optimum operating parameters such adsorbent dosage, contact time, and pH, were obtained as: a biomass dose of 0.4 g in 100 ml of mercury solution, contact time of 90 mins and pH 7, respectively. Three equations Morris –Weber, Lagergren and pseudo second order are tested to verif...

the present study was carried out to investigate three different adsorbents; dry cells of thebacterium exiguobacterium sp. 27, polyaniline and a mixture of both in different ratios for removal of ni(ii)from aqueous solution. the results showed that the adsorption of ni(ii) using dry cells of exiguobacteriumsp. 27 was very fast and the equilibrium time was 15 min, while the equilibrium time for ...

The ability of coconut husk to remove methylene blue from solution was investigated. Factors such as initial dye concentration, contact time, adsorbent dosage and pH of solution were studied. Results show that Langmuir isotherm can be successfully applied to the methylede blue coconut husk system and that coconut husk is a suitable adsorbent for such a dye. Maximum adsorption capacity is 99 mg ...

Synthetic siderite has been used as adsorbent for As(III) removal in this study. Effects of contact time, temperature, pH, co-existing anions on As(III) adsorption were intensively investigated. Adsorption mechanisms were also studied using the X-ray absorption technique. Results show that the maximum adsorption capacity is up to 9.98 mg g(-1) at 25°C at a siderite dosage of 2 g L(-1). Adsorpti...