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    STUDIA CHEMIA - Issue no. 4 / 2016  
         
  Article:   ROMANIAN (MĂCICAŞ) ZEOLITIC VOLCANIC TUFF FOR MALACHITE GREEN REMOVAL .

Authors:  HOREA BEDELEAN, ANDRADA MĂICĂNEANU.
 
       
         
  Abstract:  VIEW PDF: Romanian (Măcicaş) Zeolitic Volcanic Tuff for Malachite Green Removal

Zeolitic volcanic tuff was tested as a potential adsorbent for malachite green (MG) dye removal from aqueous solutions. The influences of contact time, temperature, dye initial concentration, solid:liquid ratio, and adsorbent grain size over the adsorption capacity and efficiency were considered. Removal efficiencies up to 99% and a monolayer capacity (Langmuir) of 4.05 mg MG/g were calculated. The equilibrium and kinetic study showed that the experimental data were best fitted on the Temkin model and that the intra-particle diffusion could be the rate determining step. Thermodynamic analysis showed that MG adsorption onto ZVT is an endothermic, non-spontaneous process.

Keywords: natural zeolite, malachite green, adsorption, efficiency, equilibrium, kinetic, thermodynamic

Published Online: 2016-12
 
         
     
         
         
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