Abstract
The main goal of present study was to examine the performance of biomass from Greek juniper needles (Juniperus excelsa M. Bieb), obtained after distillation of the raw material, for its ability to remove Cr (VI) ions from aqueous solution. The used biomass was characterized by FT-IR analysis. Batch experiments were conducted and the effects of different biosorption process parameters were determined. Maximum removal efficiency (99.58 ± 0.31 %) was obtained at pH = 1.0, adsorbent dose 0.5 g L-1, agitation speed 250 rpm, initial Cr (VI) concentration 50 mg L-1, temperature 30.0 ± 1.0°C and contact time of 30 min. The pseudo-second order model was found to provide the best fit to experimental kinetics data (R2 = 1.000) and the calculated value of equilibrium metal uptake agree quite well with the experimental value. Results indicated that the Freundlich (R2 = 0.975) and the Langmuir (R2 = 0.976) isotherm models correlated very well to the experimental equilibrium data for Cr (VI) removal. Finally, the applied biomass could be used as a cheap biosorbent for the removal of Cr (VI) ions from aqueous solutions with high maximum adsorption capacity (qmax = 143.0 mg g-1), compared to other biosorbents reported in the literature.
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