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    Copper ion removal from dilute solutions using ultrasonically synthesised BSA- and EWP-coated air bubbles

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    Authors
    Nazari, Amir Mohammad
    Cox, Phil
    Waters, Kristian E.
    Issue Date
    2014-05-27
    
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    Abstract
    The aim of this study was to remove copper ions from dilute copper solution using an innovative material known as air-filled emulsion (AFE). AFE is composed of microscopic bubbles enclosed by a thin film of cysteine-rich protein distributed through the aqueous solution. The method using AFE as an extractant is combination of air-assisted solvent extraction (AASX) and biosorption techniques. The data obtained from X-ray photoelectron spectroscopy (XPS) and Fourier transform infrared (FTIR) clearly showed the thiol, amino and carboxylic groups of bovine serum albumin (BSA) and egg white protein (EWP)-coated bubbles being responsible for copper adsorption. Moreover, it was also observed that manipulation of experimental conditions such as solution pH, temperature, biosorbent and copper concentration had a significant impact on copper ion uptake. Higher solution pH led to a greater metal uptake for both egg white protein emulsion (EWPEM) and bovine serum albumin emulsion (BSAEM). At lower pH, copper removal diminished and no copper removal was obtained at pH 2 due to the high concentration of hydrogen ions. The increase of copper uptake with temperature rise was due to both the exposure of more functional groups that were initially buried in the interior of the protein structure and an increase in reaction kinetics.
    Citation
    Copper ion removal from dilute solutions using ultrasonically synthesised BSA- and EWP-coated air bubbles 2014, 132:218 Separation and Purification Technology
    Publisher
    Elsevier
    Journal
    Separation and Purification Technology
    URI
    http://hdl.handle.net/2436/620505
    DOI
    10.1016/j.seppur.2014.05.025
    Additional Links
    http://linkinghub.elsevier.com/retrieve/pii/S1383586614003116
    Type
    Journal article
    Language
    en
    ISSN
    1383-5866
    ae974a485f413a2113503eed53cd6c53
    10.1016/j.seppur.2014.05.025
    Scopus Count
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    Faculty of Science and Engineering

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