title: Synthesis and characterization of guar gum templated hybrid nano silica.
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 375 kDa 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 (264 m(2)/g) with silica nanoparticles in the size range of 90-140 nm. Being thermally very stable and photoluminescent, the material can be potentially used for many biological, medical and environmental applications.
authors.affiliation: Department of Chemistry, University of Allahabad, Allahabad, India. singhvandanasingh@rediffmail.com
authors.forename: V
authors.initials: V
authors.lastname: Singh
authors.forename: S K
authors.initials: SK
authors.lastname: Singh
authors.forename: S
authors.initials: S
authors.lastname: Pandey
authors.forename: R
authors.initials: R
authors.lastname: Sanghi
mesh_terms: D000327:Adsorption; D005685:Galactans / Q000138:chemical synthesis* / Q000737:chemistry* / Q000302:isolation & purification; D006868:Hydrolysis; D008351:Mannans / Q000138:chemical synthesis* / Q000737:chemistry* / Q000302:isolation & purification; D053758:Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D010316:Particle Size; D053149:Plant Gums / Q000138:chemical synthesis* / Q000737:chemistry* / Q000302:isolation & purification; D012822:Silicon Dioxide / Q000138:chemical synthesis* / Q000737:chemistry*; D013499:Surface Properties; D015032:Zinc / Q000378:metabolism
chemical_list: D005685:Galactans; D008351:Mannans; D053149:Plant Gums; D012822:Silicon Dioxide; C007894:guar gum; D015032:Zinc