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Incorporation of amine-grafted halloysite nanotube to electrospun nanofibrous membranes of chitosan/poly (vinyl alcohol) for Cd (II) and Pb(II) removal
Abstract Amino group grafted halloysite nanotubes (Hal-NH2s) were used to enhance adsorption/filtration performance of chitosan (CS)/poly (vinyl alcohol) (PVA) electrospun nanofibers by coating on the polymeric membrane as well as embedding them into the polymer solution. The novel cactus-like nanofibers exerted considerably higher Cd(II) and Pb(II) adsorption capacity than other functionalized materials. The compositional changes of functionalized Hals were verified by Fourier Transform Infrared Spectroscopy (FT-IR) and X-Ray Diffraction (XRD). Morphology of Hal-NH2 loaded nanofibers was characterized as well as thermal/mechanical properties. Impacts of potentially affecting parameters including Hal-NH2 loading, pH, temperature, contact time, and initial concentration of heavy metal ions were optimized in the adsorption process. According to the well-fitted Langmuir model, the maximum adsorption capacity of Cd(II) and Pb(II) ions at 120 min were measured to be 454.5 and 476.2 mg/g for the Hal-NH2 entrapped nanofibers, while for the Hal-NH2 coated nanofibers, higher values of 516.3 and 551.6 mg/g were measured, respectively. Kinetics of the adsorption process was also studied, indicating that a pseudo-second-order model was fitted on the experimental data. In contrast to the Hal-NH2 coated nanofibers, the Hal-NH2 entrapped nanofibers were considered stable, and their adsorption capacity remained almost intact after five adsorption/desorption cycles. These affinity membranes revealed promising Cd(II) and Pb(II) ions removal, and uniform permeation flux, indicating their ability to be the next generation of adsorptive filters.
Graphical abstract Display Omitted
Highlights Novel electrospun chitosan/PVA-aminated Hal adsorptive membranes were fabricated. Adding aminated Hal improved thermal and mechanical properties of chitosan/PVA. Pb(II) and Cd(II) adsorption were enhanced about twice compared to chitosan/PVA ENMs. Nanocomposite membrane containing 7wt% aminated Hal exhibited the best performance. ENMs offered enhanced ion metal removal (up to 90%) with high flux performance.
Incorporation of amine-grafted halloysite nanotube to electrospun nanofibrous membranes of chitosan/poly (vinyl alcohol) for Cd (II) and Pb(II) removal
Abstract Amino group grafted halloysite nanotubes (Hal-NH2s) were used to enhance adsorption/filtration performance of chitosan (CS)/poly (vinyl alcohol) (PVA) electrospun nanofibers by coating on the polymeric membrane as well as embedding them into the polymer solution. The novel cactus-like nanofibers exerted considerably higher Cd(II) and Pb(II) adsorption capacity than other functionalized materials. The compositional changes of functionalized Hals were verified by Fourier Transform Infrared Spectroscopy (FT-IR) and X-Ray Diffraction (XRD). Morphology of Hal-NH2 loaded nanofibers was characterized as well as thermal/mechanical properties. Impacts of potentially affecting parameters including Hal-NH2 loading, pH, temperature, contact time, and initial concentration of heavy metal ions were optimized in the adsorption process. According to the well-fitted Langmuir model, the maximum adsorption capacity of Cd(II) and Pb(II) ions at 120 min were measured to be 454.5 and 476.2 mg/g for the Hal-NH2 entrapped nanofibers, while for the Hal-NH2 coated nanofibers, higher values of 516.3 and 551.6 mg/g were measured, respectively. Kinetics of the adsorption process was also studied, indicating that a pseudo-second-order model was fitted on the experimental data. In contrast to the Hal-NH2 coated nanofibers, the Hal-NH2 entrapped nanofibers were considered stable, and their adsorption capacity remained almost intact after five adsorption/desorption cycles. These affinity membranes revealed promising Cd(II) and Pb(II) ions removal, and uniform permeation flux, indicating their ability to be the next generation of adsorptive filters.
Graphical abstract Display Omitted
Highlights Novel electrospun chitosan/PVA-aminated Hal adsorptive membranes were fabricated. Adding aminated Hal improved thermal and mechanical properties of chitosan/PVA. Pb(II) and Cd(II) adsorption were enhanced about twice compared to chitosan/PVA ENMs. Nanocomposite membrane containing 7wt% aminated Hal exhibited the best performance. ENMs offered enhanced ion metal removal (up to 90%) with high flux performance.
Incorporation of amine-grafted halloysite nanotube to electrospun nanofibrous membranes of chitosan/poly (vinyl alcohol) for Cd (II) and Pb(II) removal
HMTShirazi, Romina (author) / Mohammadi, Toraj (author) / Asadi, Amir Atabak (author)
Applied Clay Science ; 220
2022-02-15
Article (Journal)
Electronic Resource
English
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