Recovery of Lithium Ions from Seawater Using a Continuous Flow Adsorption Column Packed with Granulated Chitosan–Lithium Manganese Oxide

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• 作者：Taegong Ryu ; Yuvaraj Haldorai ; Arunkumar Rengaraj ; Junho Shin ; Hye-Jin Hong ; Go-Woon Lee ; Young-Kyu Han ; Yun Suk Huh ; Kang-Sup Chung
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2016
• 出版时间：July 6, 2016
• 年：2016
• 卷：55
• 期：26
• 页码：7218-7225
• 全文大小：532K
• 年卷期：0
• ISSN：1520-5045

文摘

We demonstrated an efficient recovery of lithium ions (Li⁺) from seawater using a continuous flow column packed with an adsorbent, chitosan–lithium manganese oxide (LMO). The effects of Li⁺ concentration, contact time, and recyclability were investigated. The adsorbent showed good removal efficiency of Li⁺ from seawater. The maximum adsorption capacity was calculated to be 54.65 mg/g. The adsorption process fit well with the Freundlich isotherm with a correlation coefficient of 0.9924. Kinetics studies showed that the adsorption process was consistent with the pseudo-second-order model. The recyclability was tested after extraction of Li⁺ from the adsorbent using sulfuric acid. The adsorption capacity decreased slightly after recycling the adsorbent three times. This may be due to the dissolution of Mn²⁺ and deformation of the chitosan structure. A study of the selectivity of Li⁺ in seawater showed that the selectivity increased in the order Li⁺ > Mg²⁺ > Na⁺.