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The organic ligand of 3–(((5–ethoxybenzenethiol)imino)methyl)–salicylic acid (EBMS) was synthesized and then immobilized onto the mesoporous silica for the fabrication of facial composite adsorbent (FCA). The FCA was successfully utilized for the heavy lanthanide of Thulium(Tm(III)) separation, adsorption, and recovery in the solid-liquid approach. The FCA characterizations and affecting experimental parameters were assessed systematically. The Tm(III) ion was selected due to the high adsorption ability of the FCA according to the intra-series separation behaviors. The solution pH played a key role based on hydroxide formation in the basic pH region and a slightly acidic pH (3.50) was selected based on the high adsorption ability. The FCA was shown high kinetic performance and diverse competing metal ions did not interfere with Tm(III) adsorption. The Tm(III) adsorption was well-fitted with the Langmuir …