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    STUDIA CHEMIA - Ediţia nr.4 din 2013  
         
  Articol:   ADSORPTIVE CHARACTERISTICS OF HISTOSOL MODIFIED BY SIMPLE CHEMICAL TREATMENTS FOR Ni(II) REMOVAL FROM AQUEOUS MEDIA.

Autori:  DUMITRU BULGARIU, LAURA BULGARIU.
 
       
         
  Rezumat:   The adsorptive characteristics of Ni(II) from aqueous media on histosol modified by simple chemical treatments was investigated. The chemical treatments have been achieved by mixing histosol with aqueous solution of common chemical reagents (HNO3, NaCl and NaOH, respectively), without the addition of supplementary additives. The influence of initial Ni(II) concentration and equilibrium contact time was studied in a series of batch experiments, in comparison with untreated histosol. An increase of adsorption capacity of histosol in case of treatments with NaCl and NaOH (15.58 % and 24.19 %, respectively) was obtained, and this is mainly attributed to the increase of functional groups availability from adsorbent surface. In addition a significant decrease of equilibrium contact time in case of modified histosol was also found. The experimental data were analyzed using two isotherm models (Langmuir and Freundlich) and three kinetics models (pseudo-first order, pseudo-second order and intra-particle diffusion model). The Langmuir model provides best correlation of equilibrium experimental data, and the pseudo-second order describes well the adsorption kinetics of Ni(II) on untreated and modified histosol. The histosol modified by considered simple chemical treatments has potential for serving as Ni(II) adsorbent, and the cost of these treatments is very low. 

Keywords: adsorption, Ni(II) ions, histosol, chemical treatment, kinetics, isotherm
 
         
     
         
         
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