A novel magnetic adsorbent based on waste litchi peels for removing Pb(II) from aqueous solution

A new magnetic bioadsorbent, magnetic litchi peel (MLP), was synthesized by coating powdered litchi peel with Fe3O4, and was used for removing Pb(II) from aqueous solutions. The influencing factors, adsorption isotherms, kinetics, and thermodynamics of Pb(II) adsorption by MLP were investigated usin...

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Bibliographic Details
Published inJournal of environmental management Vol. 155; pp. 24 - 30
Main Authors Jiang, Ruixue, Tian, Jiyu, Zheng, Hao, Qi, Jinqiu, Sun, Shujuan, Li, Xiaochen
Format Journal Article
LanguageEnglish
Published England Elsevier Ltd 15.05.2015
Academic Press Ltd
Subjects
Adsorbents
Adsorption
Aqueous solutions
Ferric Compounds - chemistry
Fruit
Humans
Hydrogen-Ion Concentration
Kinetics
Lead
Lead - chemistry
Litchi
Litchi peel
Magnetic bioadsorbent
Magnetic Phenomena
Magnetism
Metals, Heavy - chemistry
Pb(II)
Separation
Thermodynamics
Water Pollutants, Chemical - chemistry
Litchi peel
Pb(II)
Separation
Adsorption
Magnetic bioadsorbent
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Summary:A new magnetic bioadsorbent, magnetic litchi peel (MLP), was synthesized by coating powdered litchi peel with Fe3O4, and was used for removing Pb(II) from aqueous solutions. The influencing factors, adsorption isotherms, kinetics, and thermodynamics of Pb(II) adsorption by MLP were investigated using batch assays. Optimum Pb(II) adsorption by MLP was achieved using a contact time of 120 min, an adsorbent dose of 5 g/L, and pH of 6.0. The adsorption equilibrium data conformed to the Langmuir isotherm model, yielding a maximum Pb(II) adsorption capacity of 78.74 mg/g. The adsorption kinetics for Pb(II) adsorption by MLP followed a pseudo-second-order model. The thermodynamic results suggested that Pb(II) adsorption by MLP was spontaneous and exothermic. Additionally, the magnetic adsorbent was easily and rapidly separated out of solution under an external magnetic field. [Display omitted] •A novel magnetic adsorbent was synthesized with litchi peels and Fe3O4.•The preparation and characterization of the magnetic litchi peel were introduced.•The application of the magnetic litchi peel for Pb(II) removal was presented.•The magnetic bio-adsorbent can be separated rapidly from the mixed solutions.
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ISSN:0301-4797
1095-8630
DOI:10.1016/j.jenvman.2015.03.009