Retracted: Effect of the potential difference applied on the removal of chromium by adsorption on activated carbon prepared from biomass waste material

Abstract

The objective of this study is the removal of chromium from aqueous solution by electrosorption on carbon prepared from lignocellulosic natural residue “date stones” thermally treated at 900 °C by imposing potential differences from -0.1 to -0.5V/SCE. The results make it possible to observe that the adsorption kinetics increased at more negative potentials (-0,5V). Chromium desorption tests were performed by applying positive potential differences. The effect of pH and cycles number on the elestosorption process was studied. The experimental results concluded that the better adsorption efficiency was obtained when pH equal to 10, which is about 98%. Furthermore, it was confirmed that the recycling process of adsorption/desorption could be conducted for several cycles.