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Item Equilibrium and Kinetic Modelling of Astrazon Yellow Adsorption by Sawdust: Effect of Important Parameters(2010) Ouazene, Naima; Sahmoune, Mohamed NasserThis paper aims to investigate the sorption of Astrazon yellow (A.Y.) onto sawdust (Aleppo pine tree), a forest waste as that acts as a low-cost adsorbent. In our experiments, the batch sorption is studied with respect to solute concentration, contact time, adsorbent dose, particle size and pH. The adsorption process attains equilibrium within 300 minutes. The extent of dye removal decreased with increasing particle size and increased with increasing contact time, adsorbent dose and pH. The equilibrium data were analysed by the Langmuir and Freundlich isotherms. The characteristic parameters for each isotherm were determined. By considering the experimental results and adsorption models applied in this study, it can be concluded that equilibrium data were represented well by the Langmuir isotherm equation. Maximum adsorption capacity calculated at 293K was 81.8 mg/g. Five kinetic models (pseudo-first order, pseudo-second order, fractional power, Elovich and intraparticle diffusion kinetic equations) were used to predict the adsorption rate constants. The kinetics of adsorption of the basic dye followed both Elovich and pseudo-second order kinetics, and intraparticle diffusion was not the sole rate-controlling step. The effective diffusion of Astrazon yellow in sawdust according to Boyd Model was 24.22 .1012 m2/S. In order to reveal the adsorption characteristic of sawdust samples, SEM and FTIR spectra analyses were carried out. The results show that sawdust (Aleppo pine tree) can be an alternative low-cost adsorbent for removing cationic dyes from wastewater.Item Mass-transfer processes in the adsorption of cationic dye by sawdust(Wiley, 2012) Sahmoune, Mohamed Nasser; Ouazene, NaimaAdsorption kinetic and equilibrium studies of cationic dye namely, Astrazon Yellow (AY) from aqueous solution at various initial dye concentration (15–50 mg/l), pH (2–9), particle size <1600 μm on Aleppo pine-tree sawdust were studied in a batch mode operation. Batch studies revealed that the potential of Aleppo pine-tree sawdust in dye removal was dependant on initial pH and initial dye concentration. In order to select the main rate-limiting step in the overall uptake mechanism, a single external mass transfer diffusion model, Urano and Tachikawa model and intraparticle diffusion model were used. The external mass transfer rate constant β was found to be 8.5 10-5 m-1 at initial concentration 50 mg/l of AY and 1.14 10-4 m-1 at initial concentration 15 mg/l of AY. It was observed multi-linearity in the shape of the intraparticle diffusion plot. The two phases in the intraparticle diffusion plot suggest that the sorption process proceeds by surface sorption and an intraparticle diffusion stage. The effective diffusion coefficients Di were found to be 3.88 10-11 cm2/s and 4.2 10-11 cm2/s for initial concentration of AY of 15 mg/l and 50 mg/l respectively, indicating a poor intraparticle diffusion into Aleppo pine-tree sawdust . AY sorption onto sawdust was mainly located on the surface. The equilibrium isotherms were analysed using the Langmuir, Freundlich, Temkin and Elovich models. It was seen that the sorption data fitted to Langmuir, Freundlich, Temkin and the Elovich isotherms, but they were very well described by the Langmuir model.Item Potential of sawdust materials for the removal of dyes and heavy metals : examination of isotherms and kinetics(Taylor and Francis, 2016) Sahmoune, Mohamed Nasser; Yeddou, Ahmed Reda