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dc.contributor.authorZhang, Hong
dc.date.accessioned2015-07-07T00:25:46Z
dc.date.available2015-07-07T00:25:46Z
dc.date.issued2006-12
dc.identifier.urihttp://hdl.handle.net/11122/5632
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2006en_US
dc.description.abstractHeavy metal contamination has emerged as a major health problem worldwide. Biosorption, using biological waste products as sorbents, may provide a cost effective treatment strategy. The current study investigated several types of biomass, generated from waste crab shells, as bio-sorbents to remove cadmium and copper in a batch reaction system. Isotherm studies suggested that uptake increased with increasing number of amine groups, i.e. increasing degree of deacetylation (DDA) as measured by hydrogen nuclear magnetic resonance (¹H-NMR) as well as Fourier Transform Infra-red (FTIR) spectroscopy. Potentiometric titration was shown not to be a valid method in measuring the DDA for medium DDA range. pH was proven to be a main factor affecting the adsorption because of the considerable competition of protons for the binding sites at low pH. Cu²+ had higher affinity than Cd²⁺ to the chitinous polymer. Metal adsorption was elevated by high ionic strength because of more adsorption sites becoming accessible as a result of significant expansion of the network under high ionic strength. Sulfate as salt, added in the solution, greatly stimulated the adsorption of metal ions by reducing the repulsion force between the charged surface and the metal cations.en_US
dc.description.tableofcontentsIntroduction -- Hypotheses and objectives -- Materials and methods -- Measurement of DDA -- Adsorption of Cu (II) and Cd (II) -- Conclusions and future work -- References.en_US
dc.language.isoen_USen_US
dc.titleAdsorption of Cu (II) and Cd (II) by chininous polymersen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Civil and Environmental Engineeringen_US
refterms.dateFOA2020-03-05T10:31:35Z


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