AMBIENTUM BIOETHICA BIOLOGIA CHEMIA DIGITALIA DRAMATICA EDUCATIO ARTIS GYMNAST. ENGINEERING EPHEMERIDES EUROPAEA GEOGRAPHIA GEOLOGIA HISTORIA HISTORIA ARTIUM INFORMATICA IURISPRUDENTIA MATHEMATICA MUSICA NEGOTIA OECONOMICA PHILOLOGIA PHILOSOPHIA PHYSICA POLITICA PSYCHOLOGIA-PAEDAGOGIA SOCIOLOGIA THEOLOGIA CATHOLICA THEOLOGIA CATHOLICA LATIN THEOLOGIA GR.-CATH. VARAD THEOLOGIA ORTHODOXA THEOLOGIA REF. TRANSYLVAN
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Autori: ELENA-MIRELA PICIORUȘ, PAULA SVERA (IANASI), CATALIN IANASI.
DOI: 10.24193/subbchem.2021.1.03
Published Online: 2021-03-20
Published Print: 2021-03-30
pp. 35-48
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ABSTRACT: Silicon-based mesoporous materials have become increasingly used in various fields as industry, medicine, environment, etc. We developed five samples in mild conditions, at room temperature, of mesoporous silica by substituting tetra-ethyl-orthosilicate (TEOS) with different amount of sodium silicate (Na2Si3O7) precursor by maintaining the total ratio for SiO2 at 1.8g. Acetic acid (CH3COOH)/hydrochloric acid (HCl) aqueous solution was used as catalyst keeping the pH at 5. The samples were examined by FT-IR, Raman Spectroscopy, Scanning Laser Confocal Microscopy and Nitrogen Adsorption-Desorption Isotherms. The results indicate enhancements when Na2Si3O7 was added. Sample with TEOS and lowest amount of Na2Si3O7 displayed the best surface area value (750 m2/g) and total pore volume (0.63 cm3/g). Highest amount of Na2Si3O7 in the sample (P5) has considerably influenced the roughness of the material.
Key words: Na2Si3O7, TEOS, mesoporous materials, roughness, porosity
