TY - JOUR
T1 - Adsorption capacity of iron oxide-coated gravel for landfill leachate
T2 - simultaneous study
AU - Sizirici, B.
AU - Yildiz, I.
N1 - Funding Information:
This work was supported by the Khalifa University KUIRF L1 210045 Grant. Authors are grateful to Dr. Maguy Abi Joude for helping in SEM analysis.
Publisher Copyright:
© 2016, Islamic Azad University (IAU).
PY - 2017/5/1
Y1 - 2017/5/1
N2 - Landfill leachate is a high-strength wastewater. If it is not managed properly, it can pollute surrounding environment. The aim of this study is to determine the simultaneous adsorption capacity of iron oxide-coated gravel for metals such as Cd(II), Cu(II), Fe(II), Ni(II) and Zn(II) in high-strength leachate sample. Different operating conditions such as pH, time, and dosages were investigated to determine the kinetics and mechanism of adsorption process. Coating with iron oxide changed the external surface of gravel. The adsorption capacities increased with increased pH, and the optimum pH was found to be 7. High removal rates were observed in a short period of time. The Freundlich model fitted reasonably well to the experimental data, indicating multilayer adsorption process and the heterogeneity of the surface (R2 ranging 0.57–0.94). The Temkin model fitted well to the experimental data as well (R2 ranging 0.67–0.98), indicating that the adsorption is an exothermic process. The adsorption of ions was found to obey second-order kinetics, indicating one-step, surface-only adsorption process. The degree of metal adsorption on iron oxide-coated gravel at pH 7 was in the order Cu(II) > Cd(II) > Fe(II) > Zn(II) > Ni(II).
AB - Landfill leachate is a high-strength wastewater. If it is not managed properly, it can pollute surrounding environment. The aim of this study is to determine the simultaneous adsorption capacity of iron oxide-coated gravel for metals such as Cd(II), Cu(II), Fe(II), Ni(II) and Zn(II) in high-strength leachate sample. Different operating conditions such as pH, time, and dosages were investigated to determine the kinetics and mechanism of adsorption process. Coating with iron oxide changed the external surface of gravel. The adsorption capacities increased with increased pH, and the optimum pH was found to be 7. High removal rates were observed in a short period of time. The Freundlich model fitted reasonably well to the experimental data, indicating multilayer adsorption process and the heterogeneity of the surface (R2 ranging 0.57–0.94). The Temkin model fitted well to the experimental data as well (R2 ranging 0.67–0.98), indicating that the adsorption is an exothermic process. The adsorption of ions was found to obey second-order kinetics, indicating one-step, surface-only adsorption process. The degree of metal adsorption on iron oxide-coated gravel at pH 7 was in the order Cu(II) > Cd(II) > Fe(II) > Zn(II) > Ni(II).
KW - Competitive adsorption
KW - Iron oxide-coated gravel
KW - Landfill leachate
KW - Mixed metals
UR - http://www.scopus.com/inward/record.url?scp=85018650895&partnerID=8YFLogxK
U2 - 10.1007/s13762-016-1207-9
DO - 10.1007/s13762-016-1207-9
M3 - Article
AN - SCOPUS:85018650895
SN - 1735-1472
VL - 14
SP - 1027
EP - 1036
JO - International Journal of Environmental Science and Technology
JF - International Journal of Environmental Science and Technology
IS - 5
ER -