Abstract
In the present study, adsorption of Zn (II), Cd (II) and Hg (II) ions on rice husk ash (RHA) has been investigated in single, binary and tertiary systems. Batch experiments were also carried out for mono- and multi-component systems with varying metal ions concentrations (mg/l) to investigate the competitive adsorption characteristics. Rice husk ash (RHA) has been studied for their adsorption properties pertaining to mono component solutions of metal ions. However, to treat waste water with new materials, their performance needs to be ascertained in multi component system. The scanning electron micrographs (SEM) of rice husk ash surfaces before and after the adsorbent was equilibrated with the metal ions solution, clearly establishes the presence of the metal ions and some surface modifications can be observed on the rice husk ash particles adsorption with (i) surface chemistry of the pellets on the surface of rice husk ash and (ii) inside layers of the rice husk ash. Applicability of the isotherm models namely Freundlish and Langmuir to predict the equilibrium uptake of Zn(II), Cd(II) and Hg(II) in mono, binary and tertiary systems have also been tested.
Highlights
The pollution of water resources due to the indiscriminate disposal of heavy metals has been causing world wide concern for the last few decades
Where qe represents the mass of adsorbed metal ion per unit resin, Qo mg/g is the mono layer capacity, b (1/mg) is the equilibrium constant and Ce is the equilibrium concentration of the solution, Q, and b are langmium constant related to adsorption capacity and energy of adsorption, respectively
Studies on equilibrium quantitative sorption in mono-component, and binary system have revealed that competition has occurred
Summary
The pollution of water resources due to the indiscriminate disposal of heavy metals has been causing world wide concern for the last few decades. The purpose of this study has been to investigate the adsorption characteristics of three heavy metals Zn(II), Cd(II) and (Hg)(II), onto rice husk ash in single, binary and tertiary systems. Batch mode adsorption studies of Zn(II), Cd(II) and (Hg)(II) were carried out at 30°C using 100 ml of metal ion solution with concentration ranging between 10 to 100 mg/l and 10 g/l of adsorbent and agitated
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