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    STUDIA CHEMIA - Ediţia nr.3, Tom I din 2016  
         
  Articol:   PHYSICO-CHEMICAL PROPERTIES AND CRYSTAL VIOLET ADSORPTION PERFORMANCES OF H3PO4 - MODIFIED MANGO SEEDS KERNEL.

Autori:  ANDRADA MĂICĂNEANU.
 
       
         
  Rezumat:   This study investigated the removal of Crystal Violet (CV) onto H3PO4-modified mango seeds kernel (H3PO4-MSK) from aqueous solution. The adsorbent was characterized using elemental analysis, thermal analysis (TGA), scanning electron microscopy (SEM), specific surface area and pore size distribution (BET) and Fourier Transformed Infrared Analysis (FTIR). X-ray diffraction (XRD) analysis showed that H3PO4-MSK is a type II Cellulose crystal structure, while SEM and BET analysis confirmed the macroporosity of the adsorbent. The removal efficiency of CV increased with an increase in adsorbent quantity and temperature. The maximum adsorption capacities of CV onto H3PO4-MSK increased from 23.94 to 87.23 mg/g from 30 to 50°C. Adsorption kinetics analysis indicated that pseudo-second-order and Elovich equations fitted very well the adsorption of CV onto H3PO4-MSK. The adsorption process followed the Temkin and Langmuir isotherm models. Isotherm modelling showed that CV is loosely bound to H3PO4-MSK. Further thermodynamic analysis revealed that the removal of CV from aqueous solution by H3PO4-MSK was a spontaneous and endothermic process. The proposed adsorption mechanism is CV complexation by –OH and –NH2 groups and ionic exchange on –COOH groups of H3PO4-MSK.

Key words: H3PO4-modified mango seeds kernel, adsorption, Crystal Violet, kinetics, equilibrium, thermodynamics
 
         
     
         
         
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