For initial cobaltii concentration of 500 mg l more

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Unformatted text preview: ND CARBON NANOTUBE COMPOSITES EMBEDDED IN ALGINATE BEADS FOR THE REMOVAL OF CONTAMINANTS IN WATER H.I. Ezuruike, R.W.Krause and B. B. Mamba Department of Chemical Technology, University of Johannesburg, P.O. Box 17011 Doornfontein 2028, Johannesburg, South Africa E-mail: rkrause@uj.ac.za Water is often contaminated with organic and inorganic compounds through natural means and human activities. Water that is free of toxic chemicals is essential to both human health and environment. Beta cyclodextrin (β-CD) and functionalized carbon nanotubes (f-CNTs) were used together with hexamethylene diisocyanate (HMDI) linker at a ratio of 1:8 to make polyurethanes. The synthesized polyurethanes were suspended in aqueous sodium alginate and added dr opwise into aqueous calcium chloride solution to precipitate polymer gel composites. The polymer gel composites were further crosslinked with HMDI to finally produce alginate polymer composite beads. The use of CNTs as copolymer was meant to improve the structural stability of the polymer and also increased adsorption efficiency towards organic pollutants. p-Nitrophenol was used as a model organic pollutant to evaluate the beads’ capabilities to remove pollutants in water. Sorption experiments were carried out and the data fitted to Langmuir and Freundlich isotherms. From these isotherms, the adsorption capacities for pnitrophenol in water of around 100 mg pollutant per gram of polymer were determined. The characterization was carried out using techniques such as Fourier Infra Red spectroscopy (FT-IR), Thermal Gravimetric Analysis (TGA), Transform Electron Microscopy (TEM), Scanning Electron Microscopy (SEM) and UV-visible spectroscopy. This project has its usefulness derived from the combination of the three compounds such as beta cyclodextrin (β-CD), carbon nanotubes (multiwalled) and alginates. These properties as combined are of great interest in the area of environmental remediation. ENV-P16 DEGRADATION OF PHENOL BY SONICATION IN ADDITION OF SALT Hamidah Abdullah and Nur Ismayuslini Saberi Faculty of Chemical & Natural Resources Enginee...
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This note was uploaded on 02/17/2011 for the course CHEMISTRY 101 taught by Professor Csr during the Spring '11 term at University of Louisville.

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