Preparation Of Lithium Titanium Oxide And Lithium Adsorption Property

Lithium and its compounds have been used widely as significant materials for clear resources and energy storage in various fields.Since inorganic titanium type adsorbent has high selectivity for lithium ion,excellent chemistry stability and recycling utilization,it is considered to be effective to extract lithium element from seawater or brine in low grade.In this paper,pure monoclinic phase Li₂TiO₃ and spinel phase Li₄Ti₅O₁₂ were successfully synthesized by a direct sol-gel method as precursors.The effects of varying parameters such as calcination temperature,calcination time and acid solution concentration on adsorption capacity were examined.Three-dimensionally ordered macro-porous adsorbents were prepared with PMMA colloidal crystal as template.Further,XRD,SEM,saturation adsorption,adsorption kinetics,adsorption isothermal,pH titration and selective adsorption were investigated.The experimental results shown that adsorbent derived from Li₂TiO₃ were synthesized at 1123 K for 20 h in 0.10 M HCl with lithium extraction 98.92% while titanium dissolution 0.04%.The lithium saturation were 3.44 mmol/g and 4.58 mmol/g without and with template,respectively.On the other hand,adsorbent derived from Li₄Ti₅O₁₂ were prepared at 1023 K for 10 h in 1.00 M HCl with lithium extraction 91.94% while titanium dissolution 3.30%.The lithium saturation were 2.32 mmol/g and 2.45 mmol/g without and with template.The adsorption process was fit to pseudo-second-order adsorption kinetics and Langmuir isothermal adsorption.The maximum distribution coefficient Kd was 13861.59 ml/g,indicating the adsorbent could recover lithium in low concentration with high selectivity for lithium ion.This paper provides data support for the application of titanium type adsorbent in separating lithium from solution resources.