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Author: search.filters.author.Leepipatpiboon, NatchanunSubject: search.filters.subject.HFSLM

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    Effect of diluent polarity on membrane stability in the separation of trace Pd(II) from wastewater by HFSLM using LIX84-I
    (2015-01-25)
    Wongkaew, Kraiwith
    ;
    Pancharoen, Ura
    ;
    Phatanasri, Suphot
    ;
    Leepipatpiboon, Natchanun
    ;
    Lothongkum, Anchaleeporn W.
    In a liquid membrane, the type of diluents for the selected extractant plays an important role in membrane stability and separation efficiency. High Pd(II) extraction and stripping of 96% and 91%, respectively, were observed by HFSLM under a feed pH 2, 5% (v/v) LIX84-I dissolved in kerosene and a mixture of 0.8M NH<inf>2</inf>CSNH<inf>2</inf> with 1M HCl as a stripping solution. The highest stability was attained at 350min by using hexane as a diluent. Finally, the calculated activation energy (E<inf>a</inf>) of 30 kJ/mol implied that the separation of Pd(II) was controlled by the diffusion and chemical reaction.
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    Fluid-flow models operating on linear algebra for extraction and stripping of silver ions from pharmaceutical wastewater by HFSLM
    (2013-04-05)
    Wongsawa, Thidarat
    ;
    Leepipatpiboon, Natchanun
    ;
    Thamphiphit, Nopphawat
    ;
    Pancharoen, Ura
    ;
    Lothongkum, Anchaleeporn Waritswat
    The extraction and stripping of silver ions by hollow fiber supported liquid membrane (HFSLM) was examined. Pharmaceutical wastewater containing 30mg/dm<sup>3</sup> of silver ions was used as the feed solution. LIX 84-I dissolved in kerosene, and sodium thiosulfate pentahydrate solution were used as the liquid membrane and stripping solution, respectively. The influences of several variables on the extraction and stripping of silver ions were investigated. Fluid-flow models for greater accuracy in describing the transport of silver ions from feed phase to stripping phase were developed. The models were calculated by linear algebra. The investigated parameters in the models were axial convections and axial diffusions on both sides, chemical reactions at the feed-liquid membrane and liquid membrane-stripping interfaces as well as the accumulation of silver ions in the system. The mass transfer coefficient in the liquid membrane (k<inf>m</inf>) was determined for use in the models. The final predicted concentrations of silver ions in feed and stripping phases were successfully in agreement with the experimental data. It indicates that the fluid-flow model can accurately estimate the transport of silver ions inside and outside the hollow fibers corresponding to the axial convections, axial diffusions, reactions at the feed-liquid membrane and liquid membrane-stripping interfaces. In accordance with this investigation, the HFSLM shows a practical implication for the use in pharmaceutical wastewater treatment. © 2013 Elsevier B.V.