Lithium sorption properties of HMnO in seawater and wastewater. (15th December 2015)

• Record Type: Journal Article
• Authors: Park, HyunJu; Singhal, Naresh; Jho, Eun Hea
• Is Part Of: Water research. Volume 87(2015)
• Page Start: 320
• Page End: 327
• Publication Date: 2015-12-15
• Subjects: Lithium selectivity -- Lithium manganese oxide -- Sorption isotherms -- Kinetic modeling -- Competing cations -- Thermodynamic parameters; Water -- Pollution -- Research -- Periodicals; 363.7394
• DOI: 10.1016/j.watres.2015.09.032
• Languages: English
• ISSNs: 0043-1354

Abstract

Abstract: The lithium concentration in seawater is 0.17 mg/L, which is very low, but the overall quantity is approximately 2.5 × 10 14 kg. Therefore, seawater, which contains a vast amount of lithium, could be a major alternative source that might supply the rising demand for lithium. This research was undertaken to evaluate the feasibility of a manganese oxide (HMnO) adsorbent, which was produced after leaching lithium from lithium manganese oxide, for lithium collection from seawater. The HMnO was synthesized and deformed to a plastic after wet blending of manganese oxide and lithium hydroxide, and subsequently, the influence of pH, sorption isotherms, sorption rates, sorption energies, and effects of the co-ions were measured. Thermodynamic parameters such as Δ G °, Δ H °, and Δ S ° indicated that the nature of the lithium sorption was both spontaneous and endothermic. The used HMnO could be regenerated by washing it with an HCl solution. The results demonstrated that HMnO could be effectively used for the collection of lithium from seawater with good selectivity. Highlights: Lithium Manganese Oxide was synthesized from manganese oxide and lithium hydroxide. This research was undertaken to evaluate the feasibility of a manganese oxide (HMnO) adsorbent. Optimal lithium collection was observed by increasing the pH of the solution. The used HMnO could be regenerated by washing it with an HCl solution. The mechanism for the Li ion adsorption can be explained by a redox or an ion-exchange process.