Abstract
The batch removal of ferrous ion from aqueous solution using low cost adsorbents such aszea maysdust carbon(ZDC) under different experimental conditions were investigated in this study. The process parameters studied include agitation time, initial metal ion concentration, carbon dose, pH and temperature. The adsorption followed first order reaction equation and the rate is mainly controlled by intraparticle diffusion. Freundlich and Langmuir isotherm models were applied to the equilibrium data. The adsorption capacity (Qm) obtained from the Langmuir isotherm plot were found to 37.17, 38.31, 39.37 and 40.48 mg/g. The temperature variation study showed that the ferrous ions adsorption is endothermic and spontaneous with increased randomness at the solid solution interface. Significant effect on adsorption was observed on varying the pH of the ferrous ion solutions. The Langmuir and Freundlich adsorption isotherms obtained positive ΔH0value, pH dependent results and desorption of metal ions in mineral acid suggest that the adsorption of ferrous ion on ZDC involves physisorption mechanism.
Highlights
Toxic metal compounds coming to the earth’s surface reach the earth’s water but can contaminate ground water in trace amounts by leaching from the soil
The results indicates that K0 values decreases with increase in the concentration of the ferrous ion and increases with increase in temperature
On the other hand percent removal of ferrous ion decreased with increasing initial concentration but increased with increasing adsorbent concentration
Summary
Toxic metal compounds coming to the earth’s surface reach the earth’s water (seas, lakes, ponds and reservoirs) but can contaminate ground water in trace amounts by leaching from the soil. The earth’s water may contain various toxic metals Metal ion such as ferrous ion produces undesirable effects on human and animal life even in low concentrations. Adsorption is one of the most effective methods and activated carbon is the preferred adsorbent widely employed to treat wastewater containing different classes of metal ions recognizing the economic drawback of commercial activated carbon. Many investigators have studied the feasibility of using inexpensive alternative materials like pearl millet husk, date pits, saw dust buffing dust of leather industry, coir pith, crude oil residue tropical grass, olive stone and almond shells, pine bark, wool waste, coconut shell etc., as carbonaceous precursors for the removal of metal ion from water and wastewater[1,2,3,4]. The applicability of kinetic and mass-transfer models for the adsorption of ferrous ion onto activated carbon was reported
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