High adsorptive potential of calcined magnetic biochar derived from banana peels for Cu2+, Hg2+, and Zn2+ ions removal in single and ternary systems

  • Akeem Adeyemi OladipoEmail author
  • Edith Odinaka Ahaka
  • Mustafa Gazi
Research Article


The use of banana peel as a sustainable and low-cost precursor for the fabrication of effective biochar was exploited. Here, calcined magnetic biochar (CMB) was fabricated and characterized. CMB possesses surface acidic functional groups (–OH and COO), porous structures, high saturation magnetization (39.55 emu/g), and larger surface area than the non-magnetic biochar (CB). The CMB adsorption performance (72.8, 75.9, and 83.4 mg/g for Zn2+, Cu2+, and Hg2+, respectively at pH 6) in a single component was described suitably by pseudo-second order kinetic model, Langmuir, and Redlich-Peterson adsorption isotherms. Notably, the selectivity factor values in the extended Langmuir isotherm indicated that CMB has higher adsorption affinity toward Hg2+ than Cu2+ and Zn2+ in the multi-component system. Owing to its high adsorption efficiency and fast and easy separation, the calcined magnetic biochar is considered promising and effective for the purification of heavy metal–bearing wastewater.


Banana peel Magnetic biochar Competitive ternary adsorption Heavy metal Kinetics 


Supplementary material

11356_2019_6321_MOESM1_ESM.docx (55 kb)
ESM 1 (DOCX 55 kb)


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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Faculty of EngineeringCyprus Science UniversityGirneTurkey
  2. 2.Polymeric Materials Research Laboratory, Chemistry Department, Faculty of Arts and ScienceEastern Mediterranean UniversityFamagustaTurkey

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