Synthesis and characterization of gum acacia inspired silica hybrid xerogels for mercury(II) adsorption

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• 作者：Vandana Singh ; ^a ; ^{singhvandanasingh@rediffmail.com} ; ^{vndsng@yahoo.com} ; Somit Kumar Singh^a
• 关键词：Hybrid ; Gum acacia ; Silica ; Template ; Mercury sorption
• 刊名：International Journal of Biological Macromolecules
• 出版年：2011
• 出版时间：1 April 2011
• 年：2011
• 卷：48
• 期：3
• 页码：445-451
• 全文大小：833 K

文摘

In a sol–gel process, gum acacia inspired silica xerogels have been synthesized from tetraethylorthosilicate. Besides showing photoluminescence under ultraviolet excitation, the hybrid xerogels were very efficient in capturing mercury(II) from synthetic solution. To synthesize the optimum sample (in terms of Hg(II) uptake), different ratios of H₂O:TEOS:EtOH were taken at fixed GA and catalyst concentrations where 4:1:1 ratio was found to be most favorable. Calcination in air further enhanced the mercury binding capacity of this sample. Optimum sample (H4) was obtained on calcination of the gel at 600 °C. The hybrids have been structurally characterized using Infrared spectroscopy, X-ray diffraction, scanning electron microscopy, thermo gravimetric analysis, photoluminescence spectroscopy and Brunauer–Emmett–Teller analysis. In a preliminary batch adsorption experiment, H4 was evaluated to be highly efficient in the removal Hg(II) from synthetic aqueous solution.