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This research examines adsorption of heavy metals in water using bacterial cellulose composite, revealing interactions with inorganic ions.
The adsorption behavior of Pb²⁺, Cu²⁺, and Cr³⁺ from aqueous solutions onto bacterial cellulose/magnetite (BC/Fe₃O₄) composite in multiple systems was systematically investigated, with particular focus on competitive adsorption and inorganic ion effects. The BC/Fe₃O₄ composite demonstrated significant adsorption capacity for the three heavy metals through mechanisms involving surface complexation and electrostatic interactions. Binary and ternary competitive adsorption studies revealed that the adsorption capacity followed the sequence of Pb²⁺ (0.847 mmol/g) > Cu²⁺ (0.673 mmol/g) > Cr³⁺ (0.556 mmol/g), correlating inversely with their hydration energies. The presence of inorganic ions (Na⁺, K⁺, Mg²⁺, Ca²⁺) showed inhibitory effects on heavy metal adsorption, primarily due to competition for adsorption sites. Conversely, Al³⁺ and Fe³⁺ enhanced adsorption performance through synergistic effects. Notably, Pb²⁺ adsorption remained relatively unaffected by competing ions due to its strong affinity for BC/Fe₃O₄, while Cr³⁺ showed unique behavior in competitive systems. EDTA demonstrated superior desorption efficiency compared to HNO₃, with efficiencies ranging from 61.2% to 68.4%. This study highlights the potential of BC/Fe₃O₄ composite as an effective adsorbent for heavy metal removal from complex water matrices.
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Van et al. (2025) studied this question.
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