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Novel TEMPO-oxidized cellulose nanofiber/polyvinyl alcohol/polyethyleneimine nanoparticles for Cu2+ removal in water
In this study, environmentally friendly TEMPO-oxidized cellulose nanofiber (TO-CNF)/polyvinyl alcohol (PVA)/polyethyleneimine (PEI) nanoparticles were obtained by assembling PEI into TO-CNF/PVA aerogel, which was prepared by freeze-drying method with the help of glutaraldehyde. FTIR results showed t...
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Published in: | Cellulose (London) 2021-11, Vol.28 (17), p.10999-11011 |
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Main Authors: | , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | In this study, environmentally friendly TEMPO-oxidized cellulose nanofiber (TO-CNF)/polyvinyl alcohol (PVA)/polyethyleneimine (PEI) nanoparticles were obtained by assembling PEI into TO-CNF/PVA aerogel, which was prepared by freeze-drying method with the help of glutaraldehyde. FTIR results showed that PEI likely assembled into the TO-CNF/PVA aerogel due to appearances of bending vibration of the TO-CNF/PVA/PEI nanoparticles at 1615 cm
−1
. BET results further demonstrated that PEI have successfully assembled into the aerogel since the specific surface area (22.93 m
2
/g) of TO-CNF/PVA /PEI nanoparticles was lower than that (56.37 m
2
/g) of TO-CNF/PVA aerogel. SEM results also showed that PEI could obviously regulate the morphology of TO-CNF/PVA aerogel. TGA indicated that TO-CNF/PVA/PEI nanoparticles were structurally stable at 216.4 °C. The adsorption kinetics of the TO-CNF/PVA/PEI nanoparticles for copper ion (Cu
2+
) removal presented good correlations with the Pseudo-second-order kinetic and Langmuir model (
R
2
> 0.99). Its maximum adsorption capacity for Cu
2+
according to Langmuir model was 156.8 mg/g. The adsorption equilibrium could reach in near one hour, and the adsorption efficiency could still maintain more than 80% after 3 cycles.
Graphic abstract |
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ISSN: | 0969-0239 1572-882X |
DOI: | 10.1007/s10570-021-04236-4 |