Abstract
The efficiency of unmodified and modified biosorbents (barley straw and Jerusalem artichoke stalks) in removing anionic (Acid Red) and cationic (Methylene Blue) dyes from their aqueous solutions has been studied. That the adsorption of dye onto unmodified and modified barley straw and Jerusalem artichoke stalks was found to be strongly affected by the pH value. The optimum pH is in the range of 6–10 for cationic dye and 2–3 for anionic one. The kinetic curves of cationic and anionic dye adsorption on barley straw and Jerusalem artichoke stalks are well described with the help of pseudo-second order kinetic equation. Studied biosorbents are natural, eco-friendly, and low-cost adsorbents and they can be an alternative to expensive activated carbons.
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