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Chemistry.

Removal of Lead(II), Iron(III), and Arsenic(III) from Drinking Water Using Chitosan Synthesized from Isolated Chitin. Denise Robaczewski and Stanley-Pierre Ngeyi, Madonna University, Department of Physical and Applied Sciences; Ellen Oliver Smith, Madonna University, Department of Biological and Health Sciences

Chitosan is a naturally abundant low cost biopolymer, which can easily be obtained from the exoskeleton of insects, fungus, yeast and crustaceans. Chitosan is of particular interest because the chemical structures of amine and hydroxyl groups act as chelating sites for the adsorption of metal ions, specifically heavy metal ions from aqueous solutions and drinking water. In this research, crab, shrimp, and lobster shells were deproteinized and decalcified, followed by deacetylation. The product was then washed, dried and used for analysis. FT-IR spectroscopy was used for structural verification of the product as chitosan. After verification the product was used to study the adsorption characteristics of lead, iron, and arsenic in sample solutions. The general conclusion is that chitosan acts as an excellent adsorbent for heavy metals and can thus be used for water purification.

Physical Characterization of Tubular Precipitates via the Reverse Calcium-Silica Garden. Jason J. Pagano, Saginaw Valley State University, Department of Chemistry

Reverse silica gardens consist of hollow tubular structures that form from mechanically held silicate crystals immersed into dilute metal salt solution. We investigate the structure and composition of these tubes in the context of an experimental model that allows quantitative analyses based on predetermined reactant concentrations and flow rates. In these experiments, waterglass is injected into large volumes of dilute calcium chloride solution. The walls of the resulting tubular structures are gradient materials involving calcium hydroxide. FT-IR and SEM-EDS data are presented. The solubility and thermodynamic parameters for calcium-silicate tubes are determined by a titrimetric method. The results of the latter method are compared to calcium hydroxide.

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Publication:Michigan Academician
Article Type:Author abstract
Geographic Code:1U3MI
Date:Sep 22, 2012
Words:303
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