- Tuesday, September 22, 2009
- Ibrahim Abu-Shqair, Ziad Shakhsher, and Hanin Qasem
An optical chemical sensor based on polymer swelling and shrinking will be studied by way of optical transmission. Tris (2-aminoethyl) amine-polymer will be synthesized. The sensing Polymer will be formed from poly (vinylbenzylchloride), Tris (2-aminoethyl) amine by a nucleophilic substitution reaction followed by base hydrolysis. This polymer is expected to show interesting response to pH changes as well as selectivity for different heavy metal cations. The sensing element will be produced by dispersing the Tris (2-aminoethyl) amine-polymer beads and entrapping them as microspheres in a hydrogel membrane formed by cross linking poly (vinylalcohol) with gluteraldehyde. The entrapping of the microspheres in the hydrogel aims to generate a sensing element that will be attached to the end of fiber optics, to form a fiber optic sensor that will be used in real-life sample analysis.
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- Tuesday, July 1, 2003
- Published at:Trans IChemE, Vol 81, Part B
- Removal of zinc from aqueous solutions by 15 species of plant leaves was studied. The maximum efficiency of removal was found to be by walnut and poplar leaves at pH 6 with a maximum removal of 82%. Increasing the concentration of plant leaves increased the removal of zinc up to a limit. Agitation of solution increased the efficiency of the removal process. The presence of competing and complexing agents affected the removal process negatively but also positively in few cases.
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- Monday, January 1, 2001
- Published at:Rev. Int. Contam. Ambient. 17 (2) 91-95, 2001
- Removal of copper from polluted water by plant leaves was studied using 15 species. Copper was recovered in variable percentages depending on the species and pH value of the solution. Copper recovery from a 20 mg/L copper solution ranged between 88% (in poplar leaves) and 33% (in oak leaves). For all leaves studied, maximum copper recoveries were found to be between pH 4 and 6 depending on the plant species. At pH 2 the copper was not removed by the plant leaves studied. Adsorption was suggested as the main mechanism for the reaction between copper ions and plant leaves with a reaction order equal to one.
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