New results on the extraction of Lithium ions from salt lake brine using ionic liquid tributyl phosphate

Journal of Chemical Reactivity and Synthesis

دوره 13، شماره 4، اسفند 2023، صفحه 299-310   

نوع مقاله: Research Article

نویسندگان

Abdloreza Hormati¹؛ Bahram Rezai^{* 2}؛ Hadi Hamidian Shoormasti³؛ Ghodratollah Rostami Paydar^{* 4}

¹Department of Mining Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran.

²Department of Mining Engineering, Amirkabir University of Technology, Tehran, Iran

³Department of Mining and Geology, Qaemshahr Branch, Islamic Azad University, Qaemshahr Iran

⁴Department of geology, Ahvaz Branch, Islamic Azad University, Ahvaz, Iran

چکیده

Lithium is a light metal with outstanding physical and chemical properties with many applications in the modern world. The concentration of lithium in sea water is on average 0.17 ppm and in the effluent of such a unit, it should be increased to 350 ppm on average. In this study, 1-hexyl-3-methylimidazolium [C₆mim⁺] as cation and bis (trifluoromethylsulfonyl) imide [NTf₂^-] as anion of ionic liquid (ILS) using the neutral tributyl phosphate (TBP) were developed for efficient extraction of lithium ions (Li⁺) from Salt Lake Brine. The effective parameters on lithium ions extraction process were studied including solution pH (~ 7), adsorbent dosage (100 & 300 mg) and extraction time (30 & 120 min). The extraction efficiency of lithium ion was 94 % fir ILS under the optimal conditions. The adsorption rate, adsorption capacity and mechanism are examined with applying the kinetic, isotherm and free energy models on experimental data. The Langmuir isotherm proposed adsorption capacity of 62.5 mg/g for ILs , respectively. This indicated multi-layer pattern for ILs. Free energy model is suggested a physical sorption mechanism for lithium ions. The obtained results are preformed the green ILs can be used as alternative extractant for Li⁺ from salt lake brine.