Abstract
In this study, the synchronous removal of Pb2+ and Cd2+ ions from aqueous
solutions by colloidal particles made from rice husk ash (RHA) in aqueous sodium dodecyl
sulfate (SDS) solution was investigated. The RHA derived from rice husk waste generated
from the rice mills in Wukari, north-eastern Nigeria was combined with sodium dodecyl
sulfate (SDS) for the metal ions adsorption. The adsorption studies under different
experimental conditions were optimized and the removal of Pb2+ and Cd2+ ions was highly
pH dependent. The results indicated that pH 8.0 was the optimum for the removal of the
metal ions. Adsorption equilibration time was achieved in 2 hours with maximum removal
efficiency of the metals ions attained at 71.8 and 88.9 % for Pb2+ and Cd2+ respectively.
The equilibrium data were satisfactorily fitted to Langmuir and Freudlich isotherms. The
Langmuir isotherm models gave a better representation of the data than the Freudlich
isotherms. The RHA-SDS combination showed higher adsorption capacity for Cd2+ ion
compared to Pb2+ ion under the experimental conditions in the single and binary solutions.
The study showed that RHA-SDS synergy can be effectively used for the removal of Pb2+
and Cd2+ ions from wastewater with higher efficiency compared to the use of RHA alone.
solutions by colloidal particles made from rice husk ash (RHA) in aqueous sodium dodecyl
sulfate (SDS) solution was investigated. The RHA derived from rice husk waste generated
from the rice mills in Wukari, north-eastern Nigeria was combined with sodium dodecyl
sulfate (SDS) for the metal ions adsorption. The adsorption studies under different
experimental conditions were optimized and the removal of Pb2+ and Cd2+ ions was highly
pH dependent. The results indicated that pH 8.0 was the optimum for the removal of the
metal ions. Adsorption equilibration time was achieved in 2 hours with maximum removal
efficiency of the metals ions attained at 71.8 and 88.9 % for Pb2+ and Cd2+ respectively.
The equilibrium data were satisfactorily fitted to Langmuir and Freudlich isotherms. The
Langmuir isotherm models gave a better representation of the data than the Freudlich
isotherms. The RHA-SDS combination showed higher adsorption capacity for Cd2+ ion
compared to Pb2+ ion under the experimental conditions in the single and binary solutions.
The study showed that RHA-SDS synergy can be effectively used for the removal of Pb2+
and Cd2+ ions from wastewater with higher efficiency compared to the use of RHA alone.
| Original language | English |
|---|---|
| Pages (from-to) | 20-39 |
| Journal | International Journal of Modern Analytical and Separation Sciences |
| Volume | 3 |
| Issue number | 1 |
| Publication status | Published - 28 Apr 2014 |