THE ROLE OF THE ORGANIC SOLVENT IN OBTAINING HYDROTALCITE - LIKE ANIONIC CLAY NANOPOWDERS WITH SPECIFIC TEXTURAL AND POROUS PROPERTIES
CARJA GABRIELA 1*, CIOBANU GABRIELA 1, MASAYUKI TOYOTA 2 (1)FACULTY OF INDUSTRIAL CHEMISTRY, BD. D. MANGERON, IAĹžI, 6600, ROMANIA, (2)DEPARTMENT OF CHEMICAL ENGINEERING, TOKYO INSTITUTE OF TECHNOLOGY, 2-12-1 O-OKAYAMA, MEGURO-KU, TOKYO, 152-8550, JAPAN *CORRESPONDANCE: CARJA@UAIC.RO
Hydrotalcite - like anionic clays were synthesized by the sol-gel method while ethanol and phenol were used as organic solvents in the synthesis medium. The X-ray diffraction analysis points out that the obtained nanopowders possess a well crystallized hydrotalcite – like anionic clay structure. The N2 adsorption analysis reveals that the features of the nanoparticles ensemble pattern and the textural properties of the mesoporous structure are dependent on the nature of the organic solvent. When ethanol is used in the synthesis medium the emerged nanoclay present a relatively uniform porous structure with a specific surface area of 140 m2/g and the value of N2 adsorption volume is equal to 270 mL/g. On the contrary when phenol is present as major organic solvent in the synthesis medium a lower specific surface area is obtained (77 m2/g) while the value decreases to 170 mL/g. These results point out that the nature of the organic solvent is important for tailoring the textural and porous properties of hydrotalcite – like anionic clay nanostructures.
