الفهرس 
Removal of anionic and cationic dyes by raw sawdust from aqueous solution
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Abstract
The aim of the present work is the use of low cost available adsorbent, sawdust for the removal of anionic dye acid red57 (AR57) and cationic dye basic fuchsin (BF) from aqueous solution. The effect of parameters such as contact time, pH, adsorbent dosage, initial dye concentrations and temperature were performed for AR57 and BF dyes by batch adsorption studies. The optimum operating conditions of adsorption of AR57 were obtained as contact time 50min, adsorbent dose of 0.1g and pH ranging from 3 to 4 whereas for BF the optimum operating conditions at contact time 50min, adsorbent dose of 0.2g and pH ranging from 6 to 7. Fitting equilibrium data to Langmuir, Freundlich and Temkin isotherms showed that Freundlich model was more suitable to describe AR57 and BF. The kinetic studies showed that the adsorption of AR57 and BF followed pseudo-second-order model. Thermodynamic parameters for AR57 and BF werecalculated. The surface characteristics, pore structure, bonding behavior of the samples are characterized by nitrogen adsorption/desorption (BET), scanning electron microscope (SEM) and Fourier transform infrared spectrometer (FTIR). A single stage batch adsorber was designed for adsorption of AR57 and BF by SD based on the optimum isotherm