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Response surface methodology approach for optimization of lead(II)
adsorptive removal by Spirogyra sp. biomass

Journal of Environment & Biotechnology Research, Vol. 6, No. 1, Pages 88-95, January 2017

N. Sivarajasekar, N. Mohanraj, S. Sivamani, I. Ganesh Moorthy

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ABSTRACT

In this work, various variables that affected the lead(II) removal efficiency by thermally activated adsorbent
prepared from Spirogyra species were simultaneously optimized using the experimental design method. Preliminary
experiments showed that the effect of four variables of adsorbent dosage (0.1 - 1.0 g/L), sample pH (3 - 9), initial
concentration (50 - 100 mg/L), and temperature (25 - 45 oC) were important. Therefore, response surface
methodology (RSM) based on central composite design (CCD) was performed to find a relationship between these
factors on lead(II) removal efficiency as response. The statistical parameters of the derived model were R2 =
0.9899 and F value = 10852.54. The response surface diagrams were plotted based on the defined model to show
the effects of the variables on lead(II) adsorption efficiency. Finally, non-linear optimization was carried out and
under the defined optimum conditions the predicted lead(II) removal efficiency with 95% confidence level was
found 97.6±2.3%, which is in agreement with the experimental response of 96.9±1.3%.
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Journal of Environment and Biotechnology Research
Volume 6, Number 1, 2017, pp. 88-95
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