Adsorption of Selenite on Heat Treated Sea Nodule Residue
نویسندگان
چکیده
The present study was carried out to investigate the adsorption characteristics of sea nodule residue (SNR) heated at 400°C towards aqueous selenite. Physico-chemical characterization revealed that the leached residue was a complex mixture of oxides of mainly manganese and iron along with MnCO3. Adsorption studies were carried out at varying the pH, selenite ion concentration, SNR dosage and in presence of competitive ions. It was found that the selenite adsorption increased with pH reaches maximum at pH 5.0 and then decreased. Further it was found that the percentage of selenite adsorption increased with increasing amount of adsorbent (SNR) and decreased with increasing initial concentration of selenite. It was observed that the percentage of adsorption of selenite decreased with increasing concentration of externally added ions. The overall effect of competing ions on adsorption of selenite follows the order Cl< NO3 -< SO4 2< CO3 2.
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