Abstract:
Widespread contamination of soil and groundwater by synthetic organic chemicals (e.g., dyes) has been recognized as
an issue of growing importance in recent years. For this reason, is very important to elucidate the fate and transport
pathways of these compounds in environmental components. The behavior and persistence of dyes depend on their
sorption, transformation, transport and degradation in environmental compartments.
The objectives of the present investigation has been to compare the sorption behaviour of two organic pollutants Acid
Orange 7 (C.I. 15510, 350.32 g mol-1) and Erythrosine B (C.I. 45430, M=879.86 g mol-1) onto soil from Iasi area
(Romania). The studies were performed by batch mode, at 200
C and natural pH of solution. The adsorption
characteristics and dye uptake in soil have been determined by investigating the influence of some parameters (contact
time, adsorbent dose and initial dye concentration). It was found that equilibrium sorption amount increases with the
increase in initial dye concentration and contact time. Langmuir, Freundlich and Temkin isotherm models were applied
to evaluate the adsorption process. Over the entire range of concentration the obtained results show that the adsorption
of the studied dyes follows the Freundlich model.
