Kinetic and Isotherm Studies of Ni 2+ and Pb 2+ Adsorption from Synthetic Wastewater Using Eucalyptus camdulensis —Derived Biochar

Muhammad Shafiq, Abdulrahman Ali Alazba and Muhammad Tahir Amin
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Muhammad Shafiq: Alamoudi Water Research Chair, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia
Abdulrahman Ali Alazba: Alamoudi Water Research Chair, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia
Muhammad Tahir Amin: Alamoudi Water Research Chair, King Saud University, P.O. Box 2460, Riyadh 11451, Saudi Arabia

Sustainability, 2021, vol. 13, issue 7, 1-16

Abstract: The production of biosorbents by waste biomass has attracted considerable attention due to the low cost and abundance of the raw materials. Here biochar produced from Eucalyptus camdulensis sawdust ( EU -biochar) via pyrolysis at 600 °C was used as a potential biosorbent for Ni 2+ and Pb 2+ metal ions from wastewater. Characterization experiments indicated the formation of C- and O-bearing functional groups on the EU -biochar surface, while shifts and changes in the shape of C–H bands suggested the adsorption of Ni 2+ and Pb 2+ onto EU -biochar by interacting with surface carboxylic groups. Pb 2+ was adsorbed more quickly than Ni 2+ , indicating a faster and stronger interaction of Pb 2+ with EU -biochar compared to Ni 2+ . As the initial concentrations of both metal ions increased, the percentage removal decreased, whereas increasing the EU -biochar dose improved the percentage removal but impaired the adsorption capacity for Ni 2+ and Pb 2+ . The adsorption capacity could only be improved without affecting the percentage removal of both ions by increasing the pH of the metal solutions. The sorption efficiency of EU -biochar and the removal mechanism of Ni 2+ and Pb 2+ were further explored using non-linear and linear forms of kinetic and isotherm models.

Keywords: adsorption capacity; biochar; Eucalyptus camdulensis; removal mechanism; heavy metals; removal efficiency; kinetic model; isotherm model (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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