Journal
PROCESSES
Volume 8, Issue 9, Pages -Publisher
MDPI
DOI: 10.3390/pr8091089
Keywords
competitive biosorption; divalent nickel; divalent zinc; pH and metal concentration effect; Lemna gibba; single and binary metal biosorption isotherm
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Funding
- Instituto Politecnico Nacional, Secretaria de Investigacion y Posgrado [SIP20201439]
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The biosorption ability of Lemna gibba for removing Ni2+ and Zn2+ ions in aqueous batch systems, both individually and simultaneously, was examined. The influences of solution pH and initial single and binary metal concentrations on equilibrium Ni2+ and Zn2+ biosorption was explored. The optimal solution pH for Ni2+ and Zn2+ biosorption was 6.0, for both the single and binary metal systems. Ni2+ and Zn2+ biosorption capacities increased with increasing initial metal concentrations. The presence of Zn2+ ions more adversely affected the biosorption of Ni2+ ions in the binary metal systems than vice versa. The single and binary biosorption isotherms of Ni2+ and Zn2+ revealed that L. gibba's affinity for Zn2+ ions was higher than that for Ni2+ ions. The Redlich-Peterson and Freundlich isotherm models fit well to the experimental equilibrium data of Ni2+ ions, whereas Redlich-Peterson and Langmuir models better described the equilibrium data of Zn2+ ions in single metal systems. The modified Sips isotherm model best fit the competitive biosorption data of Ni2+-Zn2+ on L. gibba. FTIR analyses suggest the involvement of hemicellulose and cellulose in the biosorption of Ni2+ and Zn2+. The presence of Ni2+ and Zn2+ on the L. gibba surface was validated by SEM-EDX.
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