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In this study, the adsorption behavior of Na+, Li+, and K+ from an oxalate solution using polymer cation exchange, Lewatit S-108 resin type sodium has been investigated. The oxalate solution was prepared at three conditions (pH 4, 6, and 12) then eluted to 50 g resin with flow rates of 25, 50, and 100 mL/hour. During the process, the alkali metals ions compete to adsorb onto resin. Adsorption behavior was directed by adsorption and kinetic tests with Langmuir and Freundlich isotherms. It was found that the resin Lewatit S-108 has a high adsorption efficiency and a great selectivity for alkali metal ion in the oxalate solution. The amount of Li+ adsorption was ± 0.0030 0.0032 mmol/g, K+ was 0.0027 0.0028 mmol/g, and Na+ was not adsorb. The faster the flow rate is, the higher the efficiency of the acquisition of Li and K gets. The higher the pH is, the maximum the amount and adsorption capacity of Li and K get. Keyword: Adsorption, Alkali Metal, Bledug Kuwu, Lithium, Lewatit Resin.

Adsorption Behavior of Alkali Metal (Na+, Li+, and K+) from Bledug Kuwu brine by Resin Adsorbent for Purification: pH and Flow Rate Parameter