Synthesis and adsorption of Ce4+-doped layered manganese lithium ion-sieve spherical particles based on PVB/PMMA blends

To address the issues of poor fluidity, significant loss during cycling, and unsuitability for industrial adsorption of lithium ion-sieve powders, the Ce 4+ -doped layered Mn-based lithium ion-sieve precursor (Li 1.37 Ce 0.001 Mn 1.22 O 3 ) was fabricated into spherical particles, by using blend of PVB and PMMA with anti-solvent phase inversion method. The incorporation of PMMA appropriately could increase the porosity and pore size of the spherical particles, while enhancing strength and compression resistance. The porosity of SCLMO was 47.86%, with particle size range of 1.5–2.0 mm. The maximum load capacity was 627.53 N, while the maximum stress was recorded at 233.46 MPa, and the Young’s modulus was 369.70 MPa. The adsorption process of corresponding lithium ion-sieve spherical particles (SCHMO) was characterized by both physical and chemical reactions, adhering to Langmuir adsorption isotherm model and following pseudo-second-order kinetics, with intraparticle diffusion being the dominant mechanism. After 15 adsorption cycles, the adsorption capacity of SCHMO for Li + stabilized at approximately 20 mg/g, with Mn dissolution loss ratio of less than 0.5%. In experiments involving the static adsorption of Li + from actual oil and gas field produced water, the adsorption capacity was recorded at 17.84 mg/g. The lithium ion-sieve spherical particles exhibited significant potential for further industrial applications.