Competitive adsorption of Pb2+, Cu2+, and Cd2+ ions on microporous titanosilicate ETS-10.
In the present study, the competitive adsorption characteristics of binary and ternary heavy metal ions Pb2+, Cu2+, and Cd2+ on microporous titanosilicate ETS-10 were investigated in batch systems. Pure microporous titanosilicate ETS-10 was synthesized with P25 as the Ti source and characterized by the techniques of X-ray diffraction (XRD), field emission-scanning electron microscope (FESEM), nitrogen adsorption, and zeta-potential. Equilibrium and kinetic adsorption data showed that ETS-10 displays a high selectivity toward one metal in a two-component or a three-component system with an affinity order of Pb2+ > Cd2+ > Cu2+. The equilibrium behaviors of heavy metals species with stronger affinity toward ETS-10 can be described by the Langmuir equation while the adsorption kinetics of the metals can be well fitted to a pseudo-second-order (PSO) model.
Lv
Lu
L
Department of Chemical and Biomolecular Engineering, National University of Singapore, 10 Kent Ridge Crescent, 119260 Singapore.
Hor
Mei Peng
MP
Su
Fabing
F
Zhao
X S
XS
D000327:Adsorption; D001667:Binding, Competitive; D002104:Cadmium / Q000737:chemistry*; D003300:Copper / Q000737:chemistry*; D006863:Hydrogen-Ion Concentration; D007854:Lead / Q000737:chemistry*; D008832:Microchemistry; D009566:Nitrates / Q000737:chemistry; D016062:Porosity; D017640:Silicates / Q000737:chemistry*; D014025:Titanium / Q000737:chemistry*
D009566:Nitrates; D017640:Silicates; D002104:Cadmium; D007854:Lead; D003300:Copper; D014025:Titanium