Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/23043
Title: Biosorption of copper and chromium by sargtassum sp: Determination of biosorption properties and investigation of metal-sorbent interactions
Authors: YANG LEI (HT026774Y)
Keywords: Biosorption, Copper, Chromium, Sargassum sp., Organic leaching, Instrument analysis
Issue Date: 6-Aug-2007
Source: YANG LEI (HT026774Y) (2007-08-06). Biosorption of copper and chromium by sargtassum sp: Determination of biosorption properties and investigation of metal-sorbent interactions. ScholarBank@NUS Repository.
Abstract: Copper and chromium biosorption properties by raw and chemically modified Sargassum sp. were investigated in this study. By modification with 0.2% formaldehyde, the organic leaching from the Sargassum sp. was reduced by 54-80% and the adsorption capacities for both contaminants were improved by 38-87%. The sorption kinetics was well remained. In both five-cycle batch and continuous column sorption processes, 0.2 M hydrochloric acid was able to elute more than 90% copper ions from the sorbents in less than 20 min. At pH > 6, 99% chromium(VI) in the Cu(II)-Cr(VI) systems was removed via copper-chromium co-precipitation. The instrumental analysis showed that copper was removed through ion exchange and coordination reactions, while redox-reduction controlled chromium(VI) biosorption process. The binding structures were copper acetate and chromium(III) acetate respectively. The surface diffusion model well described the copper biosorption kinetics. A new model based on ion exchange and coordination reactions was formulated and successfully simulated the single and multiple metal biosorption process under the influence of pH and competitive ions.
URI: http://scholarbank.nus.edu.sg/handle/10635/23043
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01-Title page and acknowledgement.pdf13.17 kBAdobe PDF

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02-Table of contents.pdf43.28 kBAdobe PDF

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03-Summary.pdf31.49 kBAdobe PDF

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04-List of figures,tables and symbols.pdf127.46 kBAdobe PDF

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05-Chapter 01 - Introduction.pdf67.05 kBAdobe PDF

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05-Chapter 02 - Literature review.pdf162.62 kBAdobe PDF

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05-Chapter 03 - Materials and methods.pdf146.7 kBAdobe PDF

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05-Chapter 04 - Copper biosorption.pdf753.55 kBAdobe PDF

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05-Chapter 05 - Copper column.pdf253.17 kBAdobe PDF

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05-Chapter 06 - Copper simulation.pdf353.14 kBAdobe PDF

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05-Chapter 07 - Chromium biosorption.pdf336.8 kBAdobe PDF

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05-Chapter 08 - Copper-chromium biosorption.pdf2.14 MBAdobe PDF

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05-Chapter 09 - A XAFA study of biosorption.pdf236.41 kBAdobe PDF

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05-Chapter 10 - Conclusions.pdf22.56 kBAdobe PDF

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05-References.pdf49.24 kBAdobe PDF

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