Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15156
Title: Biosorption of heavy metals by locally-derived marine macroalgae : Equilibrium, kinetics and mechanisms
Authors: SHENG PINGXIN
Keywords: biosorption, heavy metal, marine algae, mechanisms, equilibrium, kinetics
Issue Date: 16-Jan-2006
Source: SHENG PINGXIN (2006-01-16). Biosorption of heavy metals by locally-derived marine macroalgae : Equilibrium, kinetics and mechanisms. ScholarBank@NUS Repository.
Abstract: Biosorption is a property of certain types of inactive, dead biomass to bind and concentrate heavy metals from even very dilute aqueous solutions. This work provided guidance for the development of potential biosorbents: 1>Sargassum sp. and Padina sp. showed highest potential as biosorbents out of four marine macroalgae; and lead, copper and cadmium were more susceptible to biosorption than zinc and nickel. 2>microscopic analysis revealed the chelating character of the ion coordination to carboxyl groups; and macroscopic experiments showed the major roles of ion exchange and adsorption in the biosorption process. 3>an equilibrium biosorption isotherm model based on ion exchange and adsorption was successfully applied to regress and predict experimental results for single and multiple metal systems. 4>a two-stage kinetic behavior was observed during biosorption processes which were represented well with a one-dimensional intraparticle diffusion rate model. 5>polyvinyl alcohol (PVA) showed good chemical and mechanical stabilities as immobilization matrice; however, it caused increase in the mass transfer resistance.
URI: http://scholarbank.nus.edu.sg/handle/10635/15156
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Content List.pdf608.96 kBAdobe PDF

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Chapter 1 Introduction.pdf72.59 kBAdobe PDF

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Chapter 2 Review.pdf253.29 kBAdobe PDF

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Chapter 3 Methods.pdf1.01 MBAdobe PDF

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Chapter 4 Screening.pdf168.01 kBAdobe PDF

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Chapter 5 Characterization.pdf4.62 MBAdobe PDF

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Chapter 6 Isotherm.pdf688.9 kBAdobe PDF

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Chapter 7 Kinetics.pdf202.47 kBAdobe PDF

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Chapter 8 Immobilization.pdf1.66 MBAdobe PDF

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Chapter 9 Conclusion.pdf49.18 kBAdobe PDF

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Chapter 10 References.pdf118.9 kBAdobe PDF

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Chapter 11 Publications.pdf11.93 kBAdobe PDF

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