Preliminary investigation of mixed adsorbents for the removal of copper and methylene blue from aqueous solutions

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    With most recent studies being focused on the development of
    advanced chemical adsorbents, this paper investigates the possibility of
    using two natural low-cost materials for selective adsorption. Multiadsorbent
    systems containing tea waste and dolomite have been tested for
    their effectiveness in the removal of copper and methylene blue from
    aqueous solutions. The effects of contact time, solution pH and
    adsorption isotherms on the sorption behaviour were investigated. The
    Langmuir and Freundlich isotherms adequately described the adsorption of
    copper ions and methylene blue by both materials in different systems.
    The highest adsorption capacities for Cu and MB were calculated as 237.7
    at pH 4.5 and 150.44 mg.g‒1 at pH 7 for DO and TW+DO respectively. Tea
    waste (TW) and dolomite (DO) were characterized by Fourier transform
    infrared spectroscopy, scanning electron microscopy and Energy dispersive
    X-ray analysis. The removal of Cu and MB by dolomite was mainly via
    surface complexation while physisorption was responsible for most of the
    Cu and MB adsorption onto tea waste. Identifying the fundamental mechanisms and behaviour is key to the development of practical multi-adsorbent packed columns.
    Original languageEnglish
    Number of pages534
    Pages (from-to)525
    JournalChemical Engineering Journal
    Journal publication date01 Nov 2014
    Early online date27 Jun 2014
    Publication statusPublished - 01 Nov 2014

      Research areas

    • Multi-adsorbents , Dyes, Heavy metals, Wastewater, Adsorption technique

    ID: 10627159