Title of article :
equilibrium, mechanism, and mass transfer studies of nickel(ii) adsorption by sewage sludge-derived activated carbon
Author/Authors :
khelifi, omar université 8 mai 1945 guelma - faculté des sciences et de la technologie - laboratoire d’analyses industrielles et génie des matériaux, département de génie des procédés, guelma, algeria , nacef, mouna université 8 mai 1945 guelma - faculté des sciences et de la technologie - laboratoire d’analyses industrielles et génie des matériaux, département de génie des procédés, guelma, algeria , chelaghmia, mohamed lyamine université 8 mai 1945 guelma - faculté des sciences et de la technologie - laboratoire d’analyses industrielles et génie des matériaux, département de génie des procédés, guelma, algeria , affoune, abed mohamed université 8 mai 1945 guelma - faculté des sciences et de la technologie - laboratoire d’analyses industrielles et génie des matériaux, département de génie des procédés, guelma, algeria , mehrez, ikram université ahmed draia adrar - faculté des sciences et de la technologie - département des sciences de la matière, algeria , laksaci, hamza université ahmed draia adrar - faculté des sciences et de la technologie - département des sciences de la matière, algeria
Abstract :
the present study was undertaken to evaluate the equilibrium, mechanism, and mass transfer of nickel(ii) ions adsorption on activated carbon derived from sewage sludge. batch adsorption experiments were performed as a function of initial ni(ii) ions concentration (10-50 mg/l) and contact time (10-120 min). the experimental data were analyzed by different models and freundlich model showed a better representation of equilibrium data (r^2 0.99) and the mean adsorption energy was found to be e= 3.98 kj/mol. mechanism study indicates that both external mass transfer (d2) and mass transfer diffusion coefficient (kl) are important in determining the adsorption rates (5.50 × 10^-5 cm/s and 7.30 × 10^-7 cm/s). we also found that nickel(ii) adsorption onto activated carbon would be attributed to a physico-chemical adsorption process. the results suggest that sewage sludge-derived activated carbon could be used beneficially as an effective and alternative adsorbent for the removal of nickel(ii) ions from aqueous solutions
Keywords :
equilibrium , mechanism , mass transfer , ni(ii) adsorption , sewage sludge , activated carbon
