Ordered Mesoporous Silica Prepared in Different Solvent Conditions: Application for Cu(II) and Pb(II) Adsorption

0559802 - ÚJF 2023 RIV CH eng J - Článek v odborném periodiku
Putz, A.-M. - Ivankov, O. I. - Kuklin, A. I. - Ryukhtin, Vasil - Ianasi, C. - Ciopec, M. - Negrea, A. - Trif, L. - Horvath, Z. E. - Almásy, L.
Ordered Mesoporous Silica Prepared in Different Solvent Conditions: Application for Cu(II) and Pb(II) Adsorption.
Gels. Roč. 8, č. 7 (2022), č. článku 443. E-ISSN 2310-2861
Grant CEP: GA MŠMT EF16_013/0001812
Grant ostatní: AV ČR(CZ) StrategieAV21/23
Program: StrategieAV
Výzkumná infrastruktura: CANAM II - 90056; Reactors LVR-15 and LR-0 II - 90120
Institucionální podpora: RVO:61389005
Klíčová slova: MCM-41 * SANS * USANS * SAXS * Stober method * 2-methoxyethanol * Langmuir isotherm
Obor OECD: Polymer science
Impakt faktor: 4.6, rok: 2022
Způsob publikování: Open access
https://doi.org/10.3390/gels8070443

In this work, the synthesis of ordered mesoporous silica of MCM-41 type was investigated aimed at improving its morphology by varying the synthesis conditions in a one-pot process, employing different temperatures and solvent conditions. 2-methoxyethanol was used as co-solvent to ethanol. The co-solvent ratio and the synthesis temperature were varied. The pore morphology of the materials was characterized by nitrogen porosimetry and small angle neutron scattering (SANS), and the particle morphology by transmission electron microscopy (TEM) and ultra-small angle neutron scattering (USANS). The thermal behavior was investigated by simultaneous thermogravimetry-differential scanning calorimetry (TG-DSC) measurements. The SANS and N-2 sorption results demonstrated that a well-ordered mesoporous structure was obtained at all conditions in the synthesis at room temperature. Addition of methoxyethanol led to an increase of the pore wall thickness. Simultaneously, an increase of methoxyethanol content led to lowering of the mean particle size from 300 to 230 nm, according to the ultra-small angle scattering data. The ordered porosity and high specific surfaces make these materials suitable for applications such as adsorbents in environmental remediation. Batch adsorption measurements of metal ion removal from aqueous solutions of Cu(II) and Pb(II) showed that the materials exhibit dominantly monolayer surface adsorption characteristics. The adsorption capacities were 9.7 mg/g for Cu(II) and 18.8 mg/g for Pb(II) at pH 5, making these materials competitive in performance to various composite materials.
Trvalý link: https://hdl.handle.net/11104/0333002