Exploring the role of hydrolyzed Nb2O5 surfaces in manganese ion adsorption.
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This work investigates the adsorption of Mn2+ ions on hydrothermally synthe sized Nb2O5 nanoparticles obtained via an oxidant peroxo method, with par ticular emphasis on the role of functional groups present on the nanoparticle surface. Orthorhombic Nb2O5 was formed at a mild temperature (100 °C), yield ing nanocrystalline particles with high colloidal stability and a strongly negative surface charge. FTIR and zeta potential analyses reveal a carbonyl and hydroxyl rich surface that promotes electrostatic attraction toward Mn2+ species. Adsorp tion experiments demonstrate rapid Mn2+ uptake, reaching equilibrium within minutes, with kinetics best described by a pseudo-first-order model, indicating a physisorption-dominated process. Equilibrium data are best fitted by the Fre undlich and Redlich–Peterson isotherms, reflecting surface heterogeneity and multilayer adsorption, with an experimental adsorption capacity approaching 116.67 mg g−1. These findings demonstrate that hydrolyzed Nb2O5 is an efficient and tunable adsorbent for Mn2+ removal, offering strong potential for water treat ment and environmental remediation applications.
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FTIR, Zeta potential analyses, Adsorption of Mn2+