Add time:07/13/2019         Source:sciencedirect.com

Lithium is an important metal for energy storage applications. With the increase in demand for lithium in the near future it is important to explore low-grade brine resources, which contain the majority of known lithium resources. In this work, a λ-MnO2 diatomaceous earth composite adsorbent was synthesized by using a combination of hydrothermal treatment and solid-state calcination. The synthesized adsorbent was tested with LiCl buffered solution for various batch adsorption parameters. Loading of 28–29% λ-MnO2 on diatomaceous earth showed the best performance for lithium adsorption. The adsorption was found to follow the Langmuir isotherm model and pseudo second order kinetic model. The increase in adsorption capacity with higher temperatures indicates that lithium adsorption is endothermic in nature. It was also observed that there is a 30% loss in adsorption capacity after five adsorption-desorption cycles when hydrochloric acid was used as an eluent due to loss of Mn2+. Replacing hydrochloric acid with (NH4)2S2O8 as an eluent at 80 °C, increased the recycling stability of the adsorbent by decreasing manganese loss. The adsorbent was tested with Great Salt Lake water and 95% of lithium was extracted with high selectivity from the brine over alkali and alkaline earth metals.

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