TY - JOUR
T1 - Single and binary equilibrium studies for Ni2+ and Zn2+ biosorption onto lemna gibba from aqueous solutions
AU - Morales-Barrera, Liliana
AU - Flores-Ortiz, César Mateo
AU - Cristiani-Urbina, Eliseo
N1 - Publisher Copyright:
© 2020 by the authors.
PY - 2020/9
Y1 - 2020/9
N2 - 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.
AB - 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.
KW - Competitive biosorption
KW - Divalent nickel
KW - Divalent zinc
KW - Lemna gibba
KW - pH and metal concentration effect
KW - single and binary metal biosorption isotherm
UR - http://www.scopus.com/inward/record.url?scp=85090402178&partnerID=8YFLogxK
U2 - 10.3390/pr8091089
DO - 10.3390/pr8091089
M3 - Artículo
AN - SCOPUS:85090402178
SN - 2227-9717
VL - 8
JO - Processes
JF - Processes
IS - 9
M1 - 1089
ER -