Izvorni znanstveni članak
The Synthesis and Characterization of Low-cost Mesoporous Silica SiO2 from Local Pumice Rock
Asmaa Mourhly
; Laboratory of Materials, Catalysis and Environment (CNRST-URAC 26), University of Mohammed V, Faculty of Sciences, Rabat, Morocco
Mariam Khachani
; Laboratory of Materials, Catalysis and Environment (CNRST-URAC 26), University of Mohammed V, Faculty of Sciences, Rabat, Morocco
Adnane El Hamidi
; Laboratory of Materials, Catalysis and Environment (CNRST-URAC 26), University of Mohammed V, Faculty of Sciences, Rabat, Morocco
Mohammed Kacimi
; Laboratory of Materials, Catalysis and Environment (CNRST-URAC 26), University of Mohammed V, Faculty of Sciences, Rabat, Morocco
Mohammed Halim
; Laboratory of Materials, Catalysis and Environment (CNRST-URAC 26), University of Mohammed V, Faculty of Sciences, Rabat, Morocco
Said Arsalane
; Laboratory of Materials, Catalysis and Environment (CNRST-URAC 26), University of Mohammed V, Faculty of Sciences, Rabat, Morocco
Sažetak
Pumice is a porous volcanic rock containing a significant proportion of silica and alumina, and which has a low iron content. This natural, silica-rich material attracts wide attention because of its applications in adsorption processes, heterogeneous catalysis and nanotechnology. In this contribution, the white amorphous silica nanoparticles were extracted using an optimized alkaline treatment and an acid-precipitation process using grey pumice powder. The isolated amorphous silica SiO2 was characterized via X-Ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), Transmission Electronic Microscopy (TEM-EDS), N2 adsorption/desorption measurements and simultaneous Thermal Gravimetry/Differential Thermal Analysis (TG/DTA). The obtained results indicated that the nanosilica powder was successfully prepared via the acid-base route with a predominantly amorphous mesoporous structure having a high surface area (422m2/g). The TEM images exhibited relatively homogeneous dispersed nanosilica particles with small sizes about 5–15 nm, in accordance with XRD data. Thermal analysis of the silica powder under air atmosphere showed total mass losses of 6.5%, with endothermic effects corresponding to the removal of water molecules and the OH of silanol groups contained in the material. The investigations performed in this work have indicated that there is great scope for pumice exploitation as a raw material in the production of amorphous silica nanopowder on large scale.
Ključne riječi
Pumice rock; Amorphous silica; Nanoparticles; Surface area
Hrčak ID:
157559
URI
Datum izdavanja:
1.1.2015.
Posjeta: 1.780 *