Removal and regeneration of aqueous divalent cations by boehmite.
Boehmite (Al(OH)O) was employed for the removal of aqueous Mg(2+), Cu(2+), Cd(2+), Pb(2+), and Co(2+) at 298 K. Although boehmite was able to remove these divalent cations, the greater removal rate with boehmite of Pb(2+) (28.7%) than with Mg(2+), Cu(2+), Cd(2+), and Co(2+) (5.6, 25.3, 10.9, and 13.3%, respectively) was observed under acidic conditions. Under stronger alkaline conditions, in which the lead species was completely dissolved, a greater removal rate of Pb(2+) (more than 80%) was observed under the corresponding conditions employed for the acidic conditions. The removed lead species could not be dissolved from boehmite in an acidic solution while an evident dissolution of lead species was detected using an aqueous NaOH solution. The results shown in the present study reveal that boehmite can be employed as a reagent for the removal and regeneration of aqueous metal cations.
Sugiyama
Shigeru
S
Department of Advanced Materials, Institute of Technology and Science, The University of Tokushima, Minamijosanjima, Tokushima 770-8506, Japan. sugiyama@chem.tokushima-u.ac.jp
Kanda
Yuki
Y
Ishizuka
Hisaaki
H
Sotowa
Ken-Ichiro
K
D000143:Acids / Q000737:chemistry; D000536:Aluminum Hydroxide / Q000737:chemistry*; D000537:Aluminum Oxide / Q000737:chemistry*; D002413:Cations, Divalent / Q000737:chemistry; D008670:Metals / Q000737:chemistry*; D012972:Sodium Hydroxide / Q000737:chemistry
D000143:Acids; D002413:Cations, Divalent; D008670:Metals; D012972:Sodium Hydroxide; D000536:Aluminum Hydroxide; C069471:aluminum oxide hydroxide; D000537:Aluminum Oxide