Recycling spent lithium-ion battery as adsorbents to remove aqueous heavy metals: Adsorption kinetics, isotherms, and regeneration assessment

Document Type

Article

Publication Date

5-1-2020

Abstract

Proper disposal and resource recovery of spent batteries are crucial for environmental protection and sustainability. This study evaluated the adsorption performances of spent lithium iron phosphate (SLFP) and spent lithium manganate (SLMO) cathodes as adsorbents toward heavy metals in water. The effects of adsorption time, initial adsorbate concentrations, and co-existing ions on adsorption kinetics were examined. SLFP and SLMO demonstrated outstanding adsorption capacities for heavy metals that were higher than or comparable with other reported adsorbents. SLFP shows adsorption capacities of 44.28, 39.54, 25.63, and 27.34 mg g−1 for Cu2+, Pb2+, Cd2+ and Zn2+, respectively, SLMO achieved similar adsorption capacities (32.51, 31.83, 26.24 and 25.25 mg g−1, respectively). Among different adsorption kinetics model, the pseudo-second-order model described heavy metals adsorption kinetics best with R2 over 0.99, implying that chemisorption may be the predominant adsorption mechanism. The adsorption data at equilibrium well fitted the Langmuir isotherm model with R2 over 0.96, suggesting that the adsorption process could be endothermic. Cathode materials from of SLIBs may be recycled as adsorbents for heavy metal removal from water, which supports the “waste to treat waste” concept.

Identifier

85078506902 (Scopus)

Publication Title

Resources Conservation and Recycling

External Full Text Location

https://doi.org/10.1016/j.resconrec.2020.104688

e-ISSN

18790658

ISSN

09213449

Volume

156

Grant

2018YFJH0902

Fund Ref

U.S. Environmental Protection Agency

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