Advanced microscopy and spectroscopy reveal the adsorption and clustering of Cu(II) onto TEMPO-oxidized cellulose nanofibers

作者: Chuantao Zhu , Alexander Soldatov , Aji P. Mathew

DOI: 10.1039/C7NR01566F

关键词: Analytical chemistryRaman spectroscopyNanocelluloseMetal ions in aqueous solutionAqueous solutionX-ray photoelectron spectroscopySpectroscopyAdsorptionMaterials scienceInfrared spectroscopyChemical engineering

摘要: TEMPO (2,2,6,6-tetramethylpiperidine-1-oxylradical)-mediated oxidation nanofibers (TOCNF), as a biocompatible and bioactive material, have opened up new application of nanocellulose for the removal water contaminants. This development demands extremely sensitive accurate methods to understand surface interactions between pollutants TOCNF. In this report, we investigated adsorption metal ions on TOCNF surfaces using experimental techniques atthe nano molecular scales with Cu(II) target pollutant in both aqueous dry forms. Imaging situ atomic force microscopy (AFM), together study physiochemical properties caused by liquid, were conducted PeakForce Quantitative NanoMechanics (PF-QNM) mode at scale. The average adhesion tip single almost tripled after from 50 pN 140 pN. stiffness was also enhanced because bound carboxylate groups hardened fiber. AFM topography, scanning electron microscopy-energy dispersive X-ray spectroscopy (SEM-EDS) mapping photoelectron (XPS) indicated that covered copper nanolayers and/or nanoparticles adsorption. changes structure demonstrated Raman attenuated total reflectance-Fourier transform infrared (ATR-FTIR). methodology will be great assistance gain qualitative quantitative information process interaction charged entities medium.

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