Bentonite clay and waterglass porous monoliths via the sol-gel process

L A Adams, R O Shaibu, R E Essien, A Oki

Abstract


Porous silicate glass monoliths were obtained from two inexpensive precursors; sodium metasilicate (waterglass) (Na2SiO3) (SMS) and bentonite clay (BTC) using the sol gel synthesis. The optimal gelation mole ratio for SMS was (Na2SiO3 : H2O : H2SO4 : C2H5OH) of (1 : 13.54 : 0.5 : 1.68); while gelation for BTC was (BTC : H2O : H2SO4 : C2H5OH) of (1 : 13.54 : 1.0 : 1.68). The gels obtained were initially washed with deionised water to free the (Si-O-Si) framework from Na2SO4 as by-product of the hydrolysis, followed by aging, drying at low temperature before finally sintering at 600C to give the monoliths. The bulk density of the monoliths obtained were determined, and further characterized using Fourier transform infra red (FTIR) spectroscopy, X-ray diffraction (XRD) spectroscopy, Atomic absorption spectroscopy (AAS), and Scanning electron microscopy (SEM). The monoliths show macroporous structure with pore size ranging from 150 250 nm, and can be further tailored to give scaffolds for bone tissue repair.

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Printed ISSN: 0857-6149

Online ISSN: 2630-0508