Metal ion adsorption behavior of lignocellulosic fiber–ethylene vinyl acetate composites |
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| Authors: | Gcina D Vilakati Ajay K Mishra Shivani B Mishra Bhekie B Mamba Justice M Thwala |
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| Affiliation: | 1. Department of Chemical Technology, University of Johannesburg, Doornfontein 2028, South Africa;2. Department of Chemistry, University of Swaziland, Private Bag 4, Kwaluseni M201, Swaziland |
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| Abstract: | This study describes the applicability of lignocellulosic fiber dispersed in ethylene vinyl acetate (EVA) to adsorb Pb(II), Cr(III), and Cr(VI) ions in aqueous solutions. Water absorption studies revealed that metal‐ion uptake does not only take place on the surface of the adsorbent but ions can also diffuse into the composite. The adsorption of the metal ions under different experimental conditions was studied. Solute concentration, pH, and contact time were used to assess the adsorption capacity and efficiency. The amount of metal adsorbed increased to 7 mg/g with an increase in solute concentration but compromising the efficiency. Adsorption equilibrium was reached after 3 h, when the maximum lead adsorption was above 80%. The optimum pH for the adsorption of Pb(II) and Cr(III) was 6.5, and pH 2.5 was used for the adsorption of Cr(VI). Competitive adsorption revealed the order of adsorption to be: Pb(II) > Cr(VI) > Cr(III). POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers |
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