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Synthesis and characterization of guar gum templated hybrid nano silica

Author:
Singh, V., Singh, S.K., Pandey, S., Sanghi, R.
Source:
International journal of biological macromolecules 2011 v.49 no.2 pp. 233-240
ISSN:
0141-8130
Subject:
Fourier transform infrared spectroscopy, X-ray diffraction, adsorbents, adsorption, aqueous solutions, cadmium, calcium, guar gum, magnesium, mercury, molecular weight, nanoparticles, photoluminescence, polymerization, scanning electron microscopy, silica, surface area, temperature, transmission electron microscopy, zinc
Abstract:
The objective of the present study was the fabrication of green adsorbent hybrids for which native guar gum was used as template to polymerize tetraethoxysilane. The properties and performances of the hybrids could be tailored by using varying molecular sizes of the partially depolymerized guar gum templates of various molecular sizes as control. Zn(II) uptake from aqueous solution was used as a criterion for evaluating the adsorbent efficiency. The optimum material (H4) in terms of maximum Zn(II) uptake, was obtained when the template size used was 375kDa at a calcination temperature of 700°C. H4 was also evaluated for Ca(II), Mg(II), Cd(II) and Hg(II) adsorption. To explore the other applicability areas, the hybrids have been extensively characterized using FTIR, XRD, TGA-DTA, PL, SEM, TEM and BET analyses. H4 was found to be as efficient as previously reported vinyl modified-silica nanohybrids. It had a high surface area (264m²/g) with silica nanoparticles in the size range of 90–140nm. Being thermally very stable and photoluminescent, the material can be potentially used for many biological, medical and environmental applications.
Agid:
996781