This study observed adsorption of selected organic species from the aqueous
solution, EDTA and H2C2O4, at 283, 293 and 303 K. The adsorbent used was synthetic
zeolite NH4BETA, product of the American company Zeolyst International, with the
mole ratio of SiO2/Al2O3 = 25.00, for the purpose of examining its physical-chemical
characteristics and obtaining more thorough information on the adsorption capacity
and active centers, as well as for its potential application in purification of wastewaters
from the organic pollutants. Results proved that adsorption of the adsorbates, under
the same experimental conditions, was multi-layer physical, being stronger expressed
when the adsorbate was oxalic acid, which is logical enough since its molecule is a lot
smaller and of a simpler structure compared to the big molecule of EDTA.
