Lithium Manganese Oxide (LiMn_2O_4) Nanoparticles Synthesized by Hydrothermal Method as Adsorbent of Lithium Recovery Process from Geothermal Fluid of Lumpur Sidoarjo

摘要

Lumpur Sidoarjo is one of geothermal fluid types which has a great potential as source of lithium. Adsorption method with Lithium Manganese Oxide (LiMn_2O_4) as an adsorbent has been chosen for lithium recovery process due to low production cost and environmental friendly. LiMn_2O_4 was synthesized by hydrothermal method at 200 °C for 24 hrs, 48 hrs, and 72 hrs. As prepared LiMn_2O_4 powder is treated by acid treatment with 0.5 M HC1 solution for 24 hrs. XRD test result reveals that all of as-prepared samples are indexed as spinel structure of LiMn_2O_4 (JCPDS card no 35-0782) with no impurity peaks detected. SEM images show that LiMn_2O_4 has nanoparticles morphology with particle size around 25 nm. The highest adsorption efficiency of adsorbent is obtained by sample hydrothermal for 72 hrs with 42.76%.