title: Lithium sorption properties of HMnO in seawater and wastewater.
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 ΔG°, ΔH°, and ΔS° 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.
authors.affiliation: Integrated Research Institute of Construction and Environmental Engineering #35-216, Seoul National University, 599 Gwanak-ro, Gwanak-gu, Seoul 151-742, Republic of Korea. Electronic address: narjjis@snu.ac.kr.
authors.forename: HyunJu
authors.initials: H
authors.lastname: Park
authors.affiliation: Department of Civil and Environmental Engineering, University of Auckland, New Zealand. Electronic address: n.singhal@auckland.ac.nz.
authors.forename: Naresh
authors.initials: N
authors.lastname: Singhal
authors.affiliation: Department of Environmental Science, Hankuk University of Foreign Studies, South Korea. Electronic address: ehjho@hufs.ac.kr.
authors.forename: Eun Hea
authors.initials: EH
authors.lastname: Jho
mesh_terms: D000327:Adsorption; D008094:Lithium / Q000032:analysis*; D017895:Manganese Compounds / Q000737:chemistry*; D010087:Oxides / Q000737:chemistry*; D012623:Seawater / Q000032:analysis*; D062065:Wastewater / Q000032:analysis*
chemical_list: D008094:Lithium; D017895:Manganese Compounds; D010087:Oxides; D062065:Wastewater
keywords: Competing cations; Kinetic modeling; Lithium manganese oxide; Lithium selectivity; Sorption isotherms; Thermodynamic parameters