Abstract
The adsorption of cobalt onto biomaterial of microalga <em>Oscillatoria sp </em> was investigated via batch experiment. Marine alga <em>Oscillatoria sp </em> was isolated from Teluk Jakarta Indonesia. The characterization of the functional group with FTIR spectrum showed microalgae have a functional group of $O-H, \>C = O, \>COO, \>C-O-C, \>N-H, \>C-S, \>C-H$ and $PO_4^{3-}$. Adsorption of cobalt ion was investigated as a function of time, pH, initial cobalt concentration, the dosage of biosorbent, salinity dan shaking. Equilibrium and kinetic adsorption were obtained from the batch experiment. The cobalt adsorption followed the Langmuir and Freundlich, isotherm models. The Freundlich constant (Kf) and n were $0.1186 \>(mg/g) (L.mol)^{\frac 1 n}$ and $8.43\>mg/L$, respectively. The maximum adsorption capacity was 4.71 mg/g at pH 8. <em>Oscillatoria sp </em> could adsorb cobalt even at a lower concentration, indicating a good affinity for metal. Kinetic studies showed that the adsorption of cobalt ion followed a pseudo-first-order with $k_1 \>= \>1.2×10^{-3} min^{-1}$.
Highlights
The heavy metal contaminant is a problem in the aquatic environment because it can be accumulated in the human body and toxic above the tolerance level (Al-Rub et al, 2004)
Many types of biomass have been studied for cobalt uptake as lemon peel (Bhatnagar et al, 2010), almond green hull (Ahmadpour et al, 2009) Blighia sapida (Jimoh et al, 2012)
Prepared the material: Microalgae Oscillatoria sp obtained from an Indonesian culture collection, LIPI Cibinong
Summary
The heavy metal contaminant is a problem in the aquatic environment because it can be accumulated in the human body and toxic above the tolerance level (Al-Rub et al, 2004). Cobalt is one of the heavy metal that must be reduced in the aquatic system. The higher of Co2+ solution was explored to remove Co2+ from solution (He et al, 2011). High-level cobalt concentration caused DNA damage (Simonsen et al, 2012; Leyssens et al, 2017). One technique to reduce cobalt contaminants in the aquatic is by adsorption technique using biosorbent. Biosorption is adsorption and accumulation process of pollutants from aqueous solution using the biological materials. Biosorption technique has an advantage in reducing heavy metal ions to a very low level (Feng and Aldrich, 2004). Many types of biomass have been studied for cobalt uptake as lemon peel (Bhatnagar et al, 2010), almond green hull (Ahmadpour et al, 2009) Blighia sapida (Jimoh et al, 2012)
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