Radha, M.A.Ahmed, Z.M.A.Kahraman, H.T.Pehlivan, E.Gubari, M.Q.2025-12-242025-12-2420251755-74371755-7445https://doi.org/10.18280/ijdne.200910https://hdl.handle.net/123456789/12768This study investigates the removal of methylene blue (MB), a cationic dye, from aqueous solutions using modified nano-meerschaum (mod-nM/3APTS) functionalized with 3-aminopropyl triethoxysilane. Structural characterization by FTIR, EDX, and TEM confirmed the successful modification and improved surface activity. Batch adsorption experiments revealed that equilibrium was reached within 120 minutes, with adsorption efficiency strongly influenced by pH, adsorbent dosage, and initial MB concentration. The maximum adsorption capacity was 127.75 mg/g, consistent with the Langmuir isotherm model, indicating monolayer chemisorption. Kinetic studies showed that the adsorption process followed the pseudo-second-order model, while thermodynamic analysis confirmed that MB adsorption was spontaneous and endothermic. Furthermore, mod-nM/3APTS exhibited good regeneration performance, maintaining over 88% efficiency after five reuse cycles. These findings demonstrate that mod-nM/3APTS is a low-cost, reusable, and highly effective adsorbent for dye removal in wastewater treatment applications. ©2025 The authors.eninfo:eu-repo/semantics/openAccessCharacterizationEquilibriumKineticsMeerschaumMethylene Blue RemovalModified Nano-AdsorbentArticle10.18280/ijdne.2009102-s2.0-105021356216