Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/13980
Title: Biosorption of chromium by locally-derived marine algal biomass
Authors: TAN LAI HENG
Keywords: Biosorption, chromium, brown seaweed, kinetic, equilibrium, mechanisms
Issue Date: 27-May-2004
Source: TAN LAI HENG (2004-05-27). Biosorption of chromium by locally-derived marine algal biomass. ScholarBank@NUS Repository.
Abstract: The ability of local marine brown seaweed, Sargassum sp. and Padina sp. to remove anionic Cr(VI) and cationic Cr(III) from dilute solution was examined and compared. Kinetic and equilibrium studies were carried out to investigate the biosorption characteristic of the biomass. The biosorption of both Cr(VI) and Cr(III) was pH dependent, and the equilibrium sorption data could be modeled according to the Freundlich and Langmuir isotherms. Apart from the removal of Cr(VI) from solution by the sorption, reduction of Cr(VI) to Cr(III) was concomitantly achieved as evidenced in XPS analysis. The reduction of Cr(VI) increased with decreasing pH. XPS and FTIR were used in order to elucidate the mechanism of Cr(VI) biosorption. A comparison of Padina sp. and Sargassum sp. showed that the former has uptake capacity and a higher reduction ability than the latter. The TOC analysis also showed that the former is more stable in biosorption application.
URI: http://scholarbank.nus.edu.sg/handle/10635/13980
Appears in Collections:Master's Theses (Open)

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02 Acknowledgement.pdf9.79 kBAdobe PDF

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03 Table of Content.pdf26.57 kBAdobe PDF

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04 Summary.pdf15.8 kBAdobe PDF

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05 Nomenclature.pdf27.6 kBAdobe PDF

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06 List of Figures.pdf39.58 kBAdobe PDF

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07 List of Tables.pdf10.3 kBAdobe PDF

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08 CHAPTER 1.pdf30.09 kBAdobe PDF

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09 CHAPTER 2.pdf811.03 kBAdobe PDF

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10 CHAPTER 3.pdf237.71 kBAdobe PDF

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11 CHAPTER 4.pdf452.98 kBAdobe PDF

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12 CHAPTER 5.pdf30.6 kBAdobe PDF

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13 References.pdf142.4 kBAdobe PDF

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14 Appendix.pdf847.98 kBAdobe PDF

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