Adsorption of Pb2+ in aqueous solution by SO2-treated activated carbon

Pilot production of activated carbon from cotton stalks using H3PO4

“…Table 2 also contains the estimated surface coverage, representing only 3.8% of the total N 2 -or BET-surface area. Similar values have been reported by others for both Pb(II) adsorption capacity and percent surface coverage [30][31][32].…”

Adsorption of Zn(II) in aqueous solution by activated carbons prepared from evergreen oak (Quercus rotundifolia L.)

“…On the contrary, Linares-Solano et al [24] and Vamvuka et al [25] indicate that high ash contents may have a negative influence, reducing the rate of the reactions involved in this kind of processes. If the activated carbons obtained are aimed to the removal of ions from aqueous solutions -as is the case in the present study -our previous experience indicates that low ash contents are more effective and thus preferred [27][28][29].…”

Removal of lead from aqueous solutions with a treated spent bleaching earth

“…Many works were devoted to their elimination, the objective being to develop an effective and economic process. Heavy metals removal methods cited in the literature generally involve adsorption processes on activated carbon [1,2], ions exchange mechanism [3,4] or complexation by natural and synthetic reagents [5][6][7]. The cost of these processes led to numerous studies on alternative removal methods by use of less expensive natural materials and waste by-products such as chitosan, zeolites, clays, peat moss, fly ash, rice husk and sawdust [8].…”