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Adsorption-reduction synergistic capture of perrhenate by porphyra biochar modified NiFe-LDH Composites: Microstructure optimization and mechanism insight
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DOI：10.1016/j.jece.2026.124540.png)
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Abstract
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• A NiFe-LDH composite was synthesized using Porphyra-derived porous biochar (BC) as a growth-regulating scaffold. • The BC matrix inhibits LDH aggregation, yielding a uniform lamellar structure with enhanced active site accessibility. • The optimized composite achieves a high ReO₄⁻ adsorption capacity of 227 mg·g⁻¹ at pH 7 and 298 K. • The composite shows excellent selectivity for ReO₄⁻ in the presence of competing anions (e.g., NO₃⁻, Cl⁻, SO₄²⁻, CO₃²⁻). • Incorporated biochar reduces mobile Re(VII) to immobile Re(IV), mitigating environmental risk and aiding resource recovery.
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