Polydopamine-assisted grafting of chitosan on porous poly (L-lactic acid) electrospun membranes for adsorption of heavy metal ions

In this study, a versatile method for the manufacturing of chitosan-grafted porous poly (L-lactic acid) (P-PLLA) nanofibrous membrane by using polydopamine (PDA) as an intermediate layer has been developed. P-PLLA fibres were electrospun and collected as nano/micro fibrous membranes. Highly porous f...

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Bibliographic Details
Published in:International journal of biological macromolecules 2021-01, Vol.167, p.1479-1490
Main Authors: Zia, Qasim, Tabassum, Madeeha, Meng, Jinmin, Xin, Zhiying, Gong, Hugh, Li, Jiashen
Format: Article
Language:English
Subjects:
Adsorption
Chitosan
Chitosan - chemistry
Copper - chemistry
Electrospinning
Grafting
Hydrogen-Ion Concentration
Indoles - chemistry
Ions - chemistry
Kinetics
Metals, Heavy - chemistry
Microscopy, Electron, Scanning
Models, Statistical
Nanofibers - chemistry
Nanofibers - ultrastructure
PLLA
Polydopamine
Polyesters - chemistry
Polymers - chemistry
Porosity
Spectrophotometry
Spectroscopy, Fourier Transform Infrared
Surface Properties
Waste Water - analysis
Water Pollutants, Chemical - analysis
Water Purification - methods
X-Ray Diffraction
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Summary:In this study, a versatile method for the manufacturing of chitosan-grafted porous poly (L-lactic acid) (P-PLLA) nanofibrous membrane by using polydopamine (PDA) as an intermediate layer has been developed. P-PLLA fibres were electrospun and collected as nano/micro fibrous membranes. Highly porous fibres could serve as a substrate for chitosan to adsorb heavy metal ions. Moreover, PDA was used to modify P-PLLA surface to increase the coating uniformity and stability of chitosan. Due to the very high surface area of P-PLLA membranes and abundant amine groups of both PDA and chitosan, the fabricated membranes were utilized as adsorbent for removal of copper (Cu2+) ions from the wastewater. The adsorption capability of Cu2+ ions was examined with respect to the PDA polymerization times, pH, initial metal ion concentration and time. Finally, the equilibrium adsorption data of chitosan-grafted membranes fitted well with the Langmuir isotherm with the maximum adsorption capacity of 270.27 mg/g. •Fabrication of porous poly (l-lactic acid) nanofibers via electrospinning•Self-polymerization of dopamine on hydrophobic PPLLA nanofiberous membranes•Successful grafting of chitosan on PDA modified PPLLA membrane•Modelling of adsorption kinetics and isotherms•Enhanced adsorption capacity of chitosan grafted PPLLA/PDA membranes
ISSN:0141-8130
1879-0003
DOI:10.1016/j.ijbiomac.2020.11.101