Removal of toluidine blue by manganese/graphene coated titaniferous sand and optimization of decolouration process via Box-Behnken design

Mohamed Abbaz
2018 Mediterranean Journal of Chemistry  
<p><span lang="EN-GB">An adequate modification of a titaniferous sand fraction by manganese/graphene coating (GMnTS) was carried out. Indeed, the surface of titaniferous sand (TS) with a particle size less than 100 μm was functionalized by chemical precipitation of manganese oxide on which were coated graphene oxide nano-sheets. Modified Hummer method was used to produce a stable suspension of graphene oxide. In this study, the adsorption affinity was tested using toluidine blue (BT) as an
more » ... ic contaminant. According to the Langmuir model, GMnTS has an adsorption capacity about 12 times higher than that of unmodified titaniferous sand. This is a coating rate of about 0.73 ± 0.02 %. The response surface methodology based on Box–Behnken design was applied to optimize the linear and interactive effects of four factors (BT concentration, pH, solid/liquid ratio and KCl concentration) influencing the discoloration process by GMnTS.</span></p>
doi:10.13171/mjc71/01802061230-abbaz fatcat:vohwgce3xfhv7bnxvzjrnzgmmy