BIOSORPTION OF Pb2+, Cd2+, & Ni2+ FROM WATERS BY ...
BIOSORPTION OF Pb2+, Cd2+, & Ni2+ FROM WATERS BY ...
BIOSORPTION OF Pb2+, Cd2+, & Ni2+ FROM WATERS BY ...
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ABSTRACT<br />
<strong>BIOSORPTION</strong> <strong>OF</strong> AQUEOUS Pb 2+ , Cd 2+ , AND Ni 2+ IONS<br />
<strong>BY</strong> Dunaliella salina, Oocystis sp., Porphyridium cruentum,<br />
AND Scenedesmus protuberans PRIOR TO ATOMIC<br />
SPECTROMETRIC DETERMINATION<br />
In this study, the possibility of using four different algae for the sorption of<br />
heavy metals, namely, Pb, Cd, and Ni, from waters was investigated. Dunaliella<br />
salina, Oocystis sp., Porphyridium cruentum, and Scenedesmus protuberans were<br />
shown to be good candidates for the sorption/removal of the metals from waters prior<br />
to atomic spectrometric determination. Characterization of the algae was carried out<br />
by scanning electron microscopy, FTIR, elemental analysis, and thermogravimetric<br />
analysis.<br />
All biomasses behaved similarly in the optimization of sorption parameters.<br />
Solution pH of 6.0, sorbent amount of 10.0 mg for 10.0 mL sample volume, shaking<br />
time of 60 min, and reaction temperature of 25 ºC were used in the sorption<br />
experiments.<br />
It was demonstrated that the primary sorption mechanism is the electrostatic<br />
attraction between the negatively charged functional groups on the surface of the<br />
biomass and the positively (+2) charged metal ions in the solution. Among the<br />
biomasses investigated, Dunaliella salina has shown the highest sorption capacity for<br />
all the metal ions. It was followed by Oocystis sp., Scenedesmus protuberans and<br />
Porphyridium cruentum. Additionally, the biomasses examined have demonstrated<br />
the highest affinity towards Pb 2+ which was followed by Cd 2+ and Ni 2+ .<br />
The competitive biosorption experiments have shown that the uptake of Pb 2+<br />
ions was not influenced by the presence of other ions for all the algae studied.<br />
However, the general trend for the other biomasses was a decrease in their sorption<br />
efficiency towards Cd 2+ and Ni 2+ ions with the increase in the concentration of the<br />
competitive ions.<br />
It can be proposed that the algal biomasses investigated in this study can be<br />
utilized successfully in the sorption and selective removal of the studied heavy metal<br />
ions from waters.<br />
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