Lithium ion-sieve: Characterization and Li+ adsorption in ammonia buffer system. Issue 1 (February 2017)

• Record Type: Journal Article
• Authors: Ma, Liwen; Nie, Zuoren; Xi, Xiaoli; Zhao, Linyan; Chen, Baizhen
• Is Part Of: Journal of environmental chemical engineering. Volume 5:Issue 1(2017:Mar.)
• Page Start: 995
• Page End: 1003
• Publication Date: 2017-02
• Subjects: Lithium ion-sieve -- Valence of Mn -- Adsorption mechanism -- Application; Chemical engineering -- Environmental aspects -- Periodicals; Environmental engineering -- Periodicals; Chemical engineering -- Environmental aspects; Environmental engineering; Periodicals; 660.0286
• DOI: 10.1016/j.jece.2017.01.024
• Languages: English
• ISSNs: 2213-2929

Abstract

Highlights: Mangnese oxide MO was derived from Li1.45 Mn1.67 O4 . MO with Mn valence of 3.91 exhibits spinel structure and porous morphology. Li + adsorption of MO complies with Langmuir isotherm and pseudo-second order model. MO has affinity for Li + and can recover lithium from a spent lithium ion battery. Abstract: In this account, manganese oxide lithium ion-sieve MO derived from spinel lithium-enriched manganese oxide Li1.45 Mn1.67 O4 (LMO) was prepared and its structure, morphology and valence of Mn for both LMO and MO were analyzed by XRD, SEM and XPS, respectively. The results revealed that after acid leaching, MO maintained the spinel structure and porous morphology of LMO, which was beneficial to the Li + adsorption process. The estimated average valence of Mn in MO was 3.91. The adsorption of lithium for MO in a LiCl-NH3 ·H2 O-NH4 Cl buffer solution at pH = 9 showed the best fit with a Langmuir isotherm, indicating that a Li + -H + ion exchange mechanism took place. The adsorption kinetics study demonstrated that the Li + adsorption process of MO complied with a pseudo-second order model, where the control step of the adsorption process changed with temperatures. The ion exchange isotherms showed that the ion-sieve MO could complete an exchange reaction in LiCl-NH3 ·H2 O-NH4 Cl buffer solution. Finally, the MO was applied to recover lithium from a simulated ammoniacal spent lithium ion battery processing solution with a capacity of 15 mg/g.