Ability of Kaoline Clays in Adsorption of Aniline,P-Nitro Aniline and 0-Toludine

Abstract

Adsorption   of   AniLine  and   some   derivatives  from   aqueous. solution  on kaolin  clays surface  was investigated, The isotherms  were of type  S3  d S4  according to Giles Classification.

The   effect   of   introducing  electron   withdrawing  groups   and

electron  donating

Groups   in  the  aromatic  ring  on  the  adsorption  process   has   been investigated   ;  The  results showed  that the  extent  of  adsorption has been increased as a·result  of substitution of groups, and found  that the

derivatives  were   less   rn  adsorption    capacity   than   the   adsorption

capacity  for the uil substituted compound.

The  effect of the type of thsubstituted, grqup at the same sjte on the adsorption extent of aniline :was found  to decrease in the following order:

Aniline  > o- nitro Aniline   >  a-Toluidine

Adsorption on  kaolin  surface was examined  as afunction of temperature in the  range  (298-328k)  .  The  extent of adsorption  was

found  to illc(ease with the increase in    temperature (Endothermic)

Adsorption studies  nn  kaolin  clays surface  at different pH values. showed  an increase  in the  fol10wing order  according to  the  pH  of solution  for aniline and  o- tolu.       idine :

pH       4  >11  >  7

while foro-nitro Aniline showed  increase  in the fo-llo\ving order:

pH       11 > 4  > 7