Research
Elimination of Methylene Blue Dye with Natural Adsorbent A Banana Peels Powder A
The investigation focused on the adsorption of the blue methylene on banana peels powder. The studies led to determine contacting time (40 minutes for 90% elimination of substrate methylene blue). However, this contacting time can vary with dye concentration. The optimization of parameter such as the temperature, agitation and initial concentration of dye has showed a sensitive improvement of the capacity and rate adsorption. Moreover, the adsorption of this compound is well described by both Langmuir and Freundlich isotherm models.
Ethanol Diffusion in Polyethylene Vinyl Acetate: Modelling and Experimentation
When a polymer is contacted with a liquid food, the transfer of materials can take place. So the study method is used to find a new method to understand the packaging behavior during contact with a food by combining experimentation with modeling. The numerical model takes into account all the experimental studies. Diffusivity of liquid simulator was determined and the analytical and numerical model has been developed which aims to provide better information on the concentration of liquid simulator inside the package (PEVA).
Heavy Metal Uptake by Agro based Waste Materials
Presence of heavy metals in the aquatic systems has become a serious problem. As a result, there has been a great deal of attention given to new technologies for removal of heavy metal ions from contaminated waters. Biosorption is one such emerging technology which utilized naturally occurring waste materials to sequester heavy metals from industrial wastewater. The aim of the present study was to utilize the locally available agricultural waste materials for heavy metal removal from industrial wastewater. The wastewater containing hexavalent chromium was treated with biomass prepared from corn stalks. It was fund that a time of one hour was sufficient for sorption to attain equilibrium. The equilibrium sorption capacity after one hour was 0.375 mg.g-1. The optimum pH was (2-2.5) for chromium. Ion exchange was the major removal mechanism along with physical sorption and precipitation. The biosorption data was well fitted to Langmuir adsorption model. The kinetics of biosorption process was well described by the pseudo 2nd order kinetics model. It was concluded that adsorbent prepared from corn stalks can be utilized for the treatment of heavy metals in wastewater.
Removal of Cationic Dye Methylene Blue Onto Moroccan Clay
This study reports the adsorption of Methylene Blue dye, a cationic dye used in dyeing cotton, wood and silk, on the crude and purified clay from Morocco. The adsorption experiments demonstrated that adsorption equilibrium is established after 20 minutes. Various experimental parameters were analyzed: adsorbent mass, initial dye concentration, adsorbent particle size. The experimental results showed that adsorption of Methylene Blue onto Moroccan Clay are related to the mass of the adsorbent and the initial dye concentration. The adsorption capacity was determined using the Langmuir and Freundlich isotherms. The adsorption kinetics of Methylene Blue was studied using the equations of the Firstorder and Second order reactions. The kinetics of adsorption of Methylene Blue dye onto Moroccan Clay can be described by a Second-order model. Results showed that the Moroccan clay can be considered as a good adsorbent for the removal of Methylene Blue and treatment of industrial wastewater.
Determination of Intraparticle Diffusivity of Dye Adsorption Process on to Mytilus Edulis Shells
Textile industries release large amounts of wastewater at risk of toxicity. Shells could be alternative adsorbent materials both economic and less polluting. To highlight the process of adsorption of dyes on Mytilus Edulis shells, a model, based on an analytical method was applied to the case of spherical samples. The theoretical, results fo the kinetics of dye transfer were in good agreement with the corresponding experimental ones. The Spherical model exhibited a significant dye transfer, controlled by diffusion with different diffusivity an a coefficient of matter transfer characterizing the retardation in the transfer on the surface.
