Spinel lithium manganese oxide ion-sieves have been considered the most promising adsorbents to extract Li+ from brines and sea water.Here,we report a lithium ion-sieve which was successfully loaded onto tubular α-Al2O3 ceramic substrates by dipping crystallization and post-calcination method.The lithium manganese oxide Li4Mn5O12 was first synthesized onto tubular α-Al2O3 ceramic substrates as the ion-sieve precursor (i.e.L-AA),and the corresponding lithium ion-sieve (i.e.H-AA) was obtained after acid pickling.The chemical and morphological properties of the ion-sieve were confirmed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).Both L-AA and H-AA showed characteristic peaks of α-Al2O3 and cubic phase Li4Mn5O12,and the peaks representing cubic phase could still exist after pickling.The lithium manganese oxide Li4Mn5O12 could be uniformly loaded not only on the surface of α-Al2O3 substrates but also inside the pores.Moreover,we found that the equilibrium adsorption capacity of H-AA was 22.9 mg·g-1.After 12 h adsorption,the adsorption balance was reached.After 5 cycles of adsorption,the adsorption capacity of H-AA was 60.88％ of the initial adsorption capacity.The process of H-AA adsorption for Li + correlated with pseudo-second order kinetic model and Langmuir model.Adsorption thermodynamic parameters regarding enthalpy (△H),Gibbs free energy (△G) and entropy (△S) were calculated.For the dynamic adsorptiondesorption process of H-AA,the H-AA exhibited excellent adsorption performance to Li+ with the Li+ dynamic adsorption capacity of 9.74 mg·g-1 and the Mn2+ dissolution loss rate of 0.99％.After 3 dynamic adsorption-desorption cycles,80％ of the initial dynamic adsorption capacity was still kept.