of fast yellow dye onto dried biomass Padina pavonica was studied in
batch experiments. The amount of dye adsorbed (mg/g) was increased with the
increase in initial dye concentration. An equilibrium time of about 90 min was
achieved for dye concentrations ranging from 5 to 160 mg/L with maximum removal
percentage of 73.2%. Pseudo-first and second order kinetic models have been
used to analyze the adsorption data. The pseudo second-order kinetic model
adequately described the adsorption data with correlation coefficient between
0.96 and 1.084. Fourier transform infra-red analysis demonstrated the chelating
character of the dye molecule to different functionalities groups of the alga. Stirring
speed higher than 50 rpm revealed no significant changes in dye adsorption.
Temperature ranging from 15℃ to 65℃ showed stability followed by a decrease in
adsorption. Scanning electron microscopy of adsorbent particles showed a high
surface porosity allowing the free passage of dye molecules.
This study discusses the perspectives regarding the green alga Dunaliella
salina Toed for biodiesel manufacturing purposes. The alga was cultivated
under controlled lab conditions. Biomass concentration at early stationary
grown microalga was 2.6 mg/L dry weight, while the algal oil was about
27.1% of the biomass. Algal oil was esterified and analyzed using GLC
technique. Fourteen fatty acid methyl esters were identified. The amount of
saturated and unsaturated fatty ester fractions was 35% and 65% respectively.
The physicochemical properties of fatty acids comprising biodiesel were
discussed. However, culture optimization coupled with genetic improvement will
definitely represent contributions to bring about innovation in oil
hyper-producing D. salina that will ultimately meet with success.