Batch adsorption techniques were used to study the biosorption of Lead and Nickel from aqueous solutions by Flame of the forest pods. The effects of optimum pH, contact time, metal ion concentration, biosorbent dose, biosorbent particle size and the presence of sodium, calcium and magnesium interfering ions on the sorption were investigated. Experimental results showed that Delonix regia biomass was effective in removing these metals from aqueous solutions as the equilibrium biosorption of both metals was attained within 60minutes of interaction with 98% of the metals removed within this period. Sorption of these metals was dependent on pH as maximum removal was attained at pH 4 and pH 5 for Lead and Nickel ions respectively. Adsorption experiments showed that the process followed the pseudo second order kinetic model with high r2 (0.9999) and the equilibrium data fitted well with Langmuir and Freundlich isotherm models. The presence of competing ions impacted negatively on the sorption process irrespective of the type used. 27% and 36% of lead (II) were recovered from the spent biosorbents with 1MHCl and disodium salt of EDTA solutions respectively.
Cite this paper
A. Festus, O. Elvis and A. Morayo, "Equilibrium Sorption of Lead and Nickel from Solutions by Flame of the Forest (Delonix regia) Pods: Kinetics and Isothermic Study," Journal of Environmental Protection, Vol. 4 No. 3, 2013, pp. 261-269. doi: 10.4236/jep.2013.43031.
 WHO, “Guidelines for Drinking Water Quality,” 3rd Edition, World Health Organization, Geneva, 2000.
 S. S Ahluwalia and D. Goyal, “Microbial and Plant Derived Biomass for Removal of Heavy Metal from Waste Water,” Bioresource Technology, Vol. 98, No. 12, 2007, pp. 2243-2257. doi:10.1016/j.biortech.2005.12.006
 Z. Aksu, “Equilibrium & Kinetic Modeling of Cadmium (II) Biosorption by C. vulgaris in a Batch System: Effect of Temperature,” Separation and Purification Technology, Vol. 21, No. 3, 2001, pp. 285-294.
 J. M. S. Pearce, “‘Burton’s Line in Lead Poisoning,” European Neurology, Vol. 57, No. 2, 2007, pp. 118-119.
 B. Volesky, “Removal of Lead from Aqueous Solution by Penicillium Biomass,” Biotechnology and Bioengineering, Vol. 42, No. 6, 1993, pp. 785-787.
 I. Gaballah and G. Kilbertus, “Recovery of Heavy Metal Ions through Decontamination of Synthetic Solutions and Industrial Effluents Using Modified Barks,” Journal of Geochemical Exploration, Vol. 63, No. 1-3, 1998, pp. 21-286.
 J. L. Gardea-Torresdey, J. R. Peralta-Videa, C. D. Rosa and J. G. Parsons, “Phytoremedition of Heavy Metals and Study of the Metal Coordination by x-Ray Absorption Spectroscopy,” Coordination Chemistry Reviews, Vol. 249, No. 17-18, 2005, pp. 1797- 1810.
 B. Volesky, “Biosorption of Heavy Metal,” CRC Press, Boca Raton, 1990, p. 396.
 S. E. Bailey, J. J. Olin, R. M. Bricka and D. D. Adrian, “A Review of Potentially Low Cost Sorbents for Heavy Metals,” Water Research, Vol. 33, No. 11, 1999, pp. 2469-2479. doi:10.1016/S0043-1354(98)00475-8
 J. Chang, R. Law and C. Chang, “Biosorption of Lead, Copper and Cadmium by Biomass of Pseudomonas acruginosa,” Water Research, Vol. 31, No. 7, 1997, pp. 1651-1658. doi:10.1016/S0043-1354(97)00008-0
 E. S. Z. El-Ashtoukly, N. K. Amin and O. Abdelwahab, “Removal of Lead (II) and Copper (II) from Aqueous Solution Using Pomegranate Peel as a New Adsorbent,” Desalination, Vol. 223, No. 1-3, 2008, pp. 162-173.
 M. N. V. Prasad and H. Freitas, “Removal of Toxic Metals from Solution by Leaf, Stem and Root Phytomass of Quercus ilex L. (Holl Oak),” Environmental Pollution, Vol. 110, No. 2, 2000, pp. 277-283.
 P. Kumar and S. Daras, “Binding Heavy Metal Ions with Polymerized Onion Skin,” Journal of Polymer Science Part A: Polymer Chemistry, Vol. 19, No. 2, 1981, pp. 397-402. doi:10.1002/pol.1981.170190216
 Y. Orhan and H. Buyukgungor, “The Removal of Heavy Metals by Using Agricultural Waste,” Water Science and Technology, Vol. 28, No. 2, 1993, pp. 247-255.
 N. T. Abdel-Ghani, M. Hefry and G. A. F. El-Chaghaby, “Removal of Lead from Aqueous Solution Using Low Cost Abundantly Available Adsorbent,” International Journal of Environmental Science and Technology, Vol. 4 No. 1, 2007, pp. 67-73.
 C. Raji and T. S. Anirudhan, “Kinetics of Pb(II) Adsorption by Polyacrylamide Grafted Sawdust,” Indian Journal of Chemical Technology, Vol. 4, No. 3, 1997, pp. 157-162.
 D. V. Cowen, “Flowering Trees and Shrubs in India,” 6th Edition, Thacker & Co., Bombay, 1984, p. 1.
 K. S. Low and C. S. Lee, “Sorption of Cadmium and Lead from Aqueous Solution by Spent Grain,” Process Biochemistry, Vol. 36, No. 1-2, 2000, pp. 59-64.
 K. Wang and B. Xing, “Adsorption and Desorption of Cadmium by Goethite Pretreated with Phosphate,” Chemosphere, Vol. 48, No. 7, 2002, pp. 665-670.
 K. S. Rao, S. Anand and P. Venkateswarlu, “Adsorption of Cadmium (II) Ions from Aqueous Solutions by Tectona Grandis L. F. (Teak Leaves Powder),” Bioresources, Vol. 5, No. 1, 2010, pp. 438-454.
 Y. Ho and G. McKay, “Sorption of Dyes and Copper Ion onto Biosorbents,” Process Biochemistry, Vol. 33, No. 7, 2003, pp. 1047-1061.
 F. A. Abu Al-Rub, M. H El-Naas, F. Benyahia and I. Ashour, “Biosorption of Nickel on Blank Alginate Beads, Free and Immobilized Algal Cells,” Process Biochemistry, Vol. 39, No. 11, 2004, pp. 1767-1773.
 P. R. Puranik and K. Mpaknikar, “Biosorption of Lead, Cadmium and Zinc by Citrobacter Strain,” Biotechnology Process, Vol. 15, No. 2. 1999, pp. 228-237.
 V. B. Saradhii, S. R. K. Rao, P. Y. Kumar, K. Kumaraswamy, B. Sumalatha, A. T. Kumar and G. Kalyani, “Biosorption Studies of Heavy Metal ion on Echinoid,” International Journal of Chemical Engineering Research, Vol. 2, No. 2, 2010, pp. 149-157.
 S. Al-Asheh and Z. Duvnjak, “Binary Metal Sorption by Pine Bark: Study of Equilibria and Mechanisms,” Separation Science and Technology, Vol. 33, No. 9. 1998, pp 351-368.
 U. R. Malik, S. M. Hassany and M. S. Subhani, “Sorptive Potential of Sunflower Stem for Cr (lll) ions from Aqueous Solution and Its Kinetics and Thermodynamics Profile,” Talanta, Vol. 66, No. 1, 2005, pp. 166-173.
 I. Villaesusa, N. Fiola, M. Martinez, N. Miralles, J. Poel and J. Serarols, “Removal of Copper & Nickel Ion from aq. Solution by Grape Stalks Wastes,” Water Research, Vol. 38, No. 4, 2004, pp. 992-1002.
 Y. Bulut and Z. Baysal, “Removal of Pb (II) from Waste- water Using Wheat Bran,” Journal of Environmental Management, Vol. 78, No. 2, 2006, pp. 107-113.