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

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 magnetiza...

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Bibliographic Details
Published in:Environmental science and pollution research international 2019-11, Vol.26 (31), p.31887-31899
Main Authors: Oladipo, Akeem Adeyemi, Ahaka, Edith Odinaka, Gazi, Mustafa
Format: Article
Language:English
Subjects:
Adsorption
Adsorptivity
Aquatic Pollution
Atmospheric Protection/Air Quality Control/Air Pollution
Charcoal
Copper
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental science
Fabrication
Functional groups
Heavy metals
Isotherms
Magnetic saturation
Mercury (metal)
Purification
Research Article
Roasting
Selectivity
Surface chemistry
Ternary systems
Waste Water Technology
Wastewater
Water Management
Water Pollution Control
Zinc
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Summary: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 Zn 2+ , Cu 2+ , and Hg 2+ , 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 Hg 2+ than Cu 2+ and Zn 2+ 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.
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-019-06321-5