Abstract:
The objective of this work is to study the possibility of removing hexavalent chromium by
adsorption on the orange peel and to determine the effect of different reaction parameters on
the process. The tests were carried out in synthetic solutions of distilled water. The results of
the adsorption kinetics showed that, after 90 minutes of contact, the elimination of hexavalent
chromium is maximum with a yield equal to 99 ℅. The increase in the dose of the adsorbent
(1 to 10 g / l) makes it possible to improve the elimination efficiency of hexavalent chromium
for an initial concentration of 50 mg / l. Capacity of chromium removal by adsorbent
increases with increasing initial hexavalent chromium content (10 to 100 mg / l). The pH of
the medium greatly affects the hexavalent chromium retention rate. The elimination
efficiencies of hexavalent chromium are interesting at acid pH (pH = 2). The application of
Design of Experiment (full factorial) confirms the previous results.
Adsorption of polluting on orange skins conforms to a pseudo-second order model.
The results obtained indicate that the adsorption of hexavalent chromium of our biosorbent is
well described by the Langmuir model.
