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    STUDIA CHEMIA - Ediţia nr.3,%20Tom%20I din 2016  
         
  Articol:   ADSORPTION, ECHILIBRIUM AND KINETIC STUDY OF MALACHITE GREEN REMOVAL FROM AQUEOUS SOLUTIONS USING FIR (ABIES NORDMANNIANA) CONES BIOMASS.

Autori:  ANA-MARIA SĂCARĂ, CERASELLA INDOLEAN, LIANA MARIA MUREȘAN. 		 
       
         
  Rezumat:   Adsorption of Malachite Green (MG) dye on a biomass prepared from fir (Abies nordmanniana) cones, followed by UV–Vis detection has been studied. The biomass was characterized using scanning electron microscopy (SEM). The maximum adsorption capacity of MG onto fir cones biomass was determined to be 2.197 mg/g. The influence of pH on the removal of the MG dye was investigated and the results showed that the best adsorption capacity were obtained in the most acidic environment (pH=2). The adsorption rates were evaluated by fitting the experimental data to conventional kinetic models such as pseudo- first- and pseudo-second-order models. From the Dubinin–Radushkevich isotherm model, a 5.95 kJ/mol value for the mean free energy was calculated, indicating that MG adsorption could include an important physisorption stage.

Keywords: adsorption, cones biomass, Abies nordmanniana, kinetics, dyes, malachite green
 
         
     
         
         
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