Heavy metals are serious pollutants in aquatic environments. A study was undertaken to remove Cu,
Cd, Ni, Pb and Zn individually (single metal system) and together (mixed metals system) from water
by adsorption onto a sodium titanate nanofibrous material. Langmuir adsorption capacities (mg/g) at
10
−3
M NaNO3
ionic strength in the single metal system were 60, 83, 115 and 149 for Ni, Zn, Cu, and Cd,
respectively, at pH 6.5 and 250 for Pb at pH 4.0. In the mixed metals system they decreased at high metals
concentrations. In column experiments with 4% titanate material and 96% granular activated carbon
(w/w) mixture at pH 5.0, the metals breakthrough times and adsorption capacities (for both single and
mixed metals systems) decreased in the order Pb > Cd, Cu > Zn > Ni within 266 bed volumes. The amounts
adsorbed were up to 82 times higher depending on the metal in the granular activated carbon + titanate
column than in the granular activated carbon column. The study showed that the titanate material has
high potential for removing heavy metals from polluted water when used with granular activated carbon
at a very low proportion in fixed-bed columns.
Heavy metals are serious pollutants in aquatic environments. A study was undertaken to remove Cu,Cd, Ni, Pb and Zn individually (single metal system) and together (mixed metals system) from waterby adsorption onto a sodium titanate nanofibrous material. Langmuir adsorption capacities (mg/g) at10−3M NaNO3ionic strength in the single metal system were 60, 83, 115 and 149 for Ni, Zn, Cu, and Cd,respectively, at pH 6.5 and 250 for Pb at pH 4.0. In the mixed metals system they decreased at high metalsconcentrations. In column experiments with 4% titanate material and 96% granular activated carbon(w/w) mixture at pH 5.0, the metals breakthrough times and adsorption capacities (for both single andmixed metals systems) decreased in the order Pb > Cd, Cu > Zn > Ni within 266 bed volumes. The amountsadsorbed were up to 82 times higher depending on the metal in the granular activated carbon + titanatecolumn than in the granular activated carbon column. The study showed that the titanate material hashigh potential for removing heavy metals from polluted water when used with granular activated carbonat a very low proportion in fixed-bed columns.
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